JVC LT-26X575-T Service Manual

SERVICE MANUAL

LCD FLAT TELEVISION

YA21320049

LT-26X575/T

BASIC CHASSIS

TABLE OF CONTENTS

1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

No.YA213

2004/9

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 70.3cm × 55.5 cm × 30.0 cm [Included stand]

70.3cm × 49.1 cm × 10.7 cm [TV only]

Mass 19 kg [Included stand]

15.8kg [TV only]

Power Input AC110V , 60Hz

Power Consumption 152W (Max)

TV RF System CCIR (M)

Color System NTSC

Sound System BTSC (Multi Channel Sound)

Teletext System Closed caption (T1-T4 / CC1-CC4)

TV Receiving Channels and Frequency

TV / CATV Total Channel 181 Channels

Intermediate Frequency Video IF

Color Sub Carrier 3.58 MHz

LCD panel 26V-inch wide aspect (16:9)

Screen Size Diagonal : 64.8cm (H:56.5cm × V : 31.8cm) Display Pixels Horizontal : 1280 dots × Vertical : 768 dots (W-XGA)

Audio Power Output 10W + 10W

Speaker 6.6cm, round type × 2 (Oblique corn) Antenna terminal (VHF/UHF) F-type connector, 75Ω unbalanced, coaxial

Video / Audio input [INPUT-1/2/3]

Digital input Video

Audio output 500mV (rms), Low impedance, RCA pin jack × 2 Headphone 3.5mm stereo mini jack × 1 Remote Control Unit RM-C1257G (AA/R6 / UM-3 battery × 2)

Design & specifications are subject to change without notice.

Component Video

VHF Low

VHF High

UHF

CATV

Sound IF

[INPUT-1]

1125i / 750p

525p / 525i

S-Video

[INPUT-1/2]

Video Audio

Audio

02ch to 06ch : 54MHz to 88MHz 07ch to 13ch : 174MHz to 216MHz 14ch to 69ch : 470MHz to 806MHz 54MHz to 804MHz Low Band : 02 to 06, A-8 by 02 to 06&01 High Band : 07 to 13 by 07 to 13 Mid Band : A to I by 14 to 22 Super Band : J to W by 23 to 36 Hyper Band : W+1 to W+28 by 37 to 64 Ultra Band : W+29 to W+84 by 65 to 94, 100 to 125 Sub Mid Band : A4 to A1 by 96 to 99

[Reception of channel A-5 (“95” of the TV set’s on-screen CABLE channel) is recommended for your TV set.]

45.75 MHz

41.25 MHz (4.5MHz)

RCA pin jack × 3 Y : 1V (p-p) (Sync signal: 0.35V(p-p), 3-value sync.), 75 Ω

Pb/Pr : ±0.35V(p-p), 75 Ω Y : 1V (p-p), Positive (Negative sync provided), 75 Ω Cb/Cr : 0.7V(p-p), 75 Ω Mini-DIN 4 pin × 2 Y: 1V (p-p), Positive (Negative sync provided), 75 Ω C: 0.286V (p-p) (Burst signal), 75 Ω 1V (p-p), Positive (Negative sync provided), 75 Ω, RCA pin jack × 3 500mV (rms), High impedance, RCA pin jack × 6

HDMI connector × 1

(Digital-input terminal is not compatible with picture signals of computer signal)

Digital: HDMI connector × 1 Anarog: 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2

1-2 (No.YA213)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS

(1) The design of this product contains special hardware,

many circuits and components specially for safety purposes. For continued protection, no changes should be made to the original design unless authorized in writing by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be performed by qualified personnel only.

(2) Alterations of the design or circuitry of the products should

not be made. Any design alterations or additions will void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or property damage resulting therefrom.

(3) Many electrical and mechanical parts in the products have

special safety-related characteristics. These characteristics are often not evident from visual inspection nor can the protection afforded by them necessarily be obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have these special safety characteristics are identified in the parts list of Service manual. Electrical components

having such features are identified by shading on the schematics and by ( ) on the parts list in Service manual. The use of a substitute replacement which does

not have the same safety characteristics as the recommended replacement part shown in the parts list of Service manual may cause shock, fire, or other hazards.

(4) Don't short between the LIVE side ground and

ISOLATED (NEUTRAL) side ground or EARTH side ground when repairing.

Some model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND, the ISOLATED (NEUTRAL) : ( ) side GND and EARTH : ( ) side GND. Don't short between the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND and never measure the LIVE side GND and ISOLATED (NEUTRAL) side GND or EARTH side GND at the same time with a measuring apparatus (oscilloscope etc.). If above note will not be kept, a fuse or any parts will be broken.

(5) When service is required, observe the original lead dress.

Extra precaution should be given to assure correct lead dress in the high voltage circuit area. Where a short circuit has occurred, those components that indicate evidence of overheating should be replaced. Always use the manufacturer's replacement components.

(6) Isolation Check (Safety for Electrical Shock Hazard)

After re-assembling the product, always perform an isolation check on the exposed metal parts of the cabinet (antenna terminals, video/audio input and output terminals, Control knobs, metal cabinet, screw heads, earphone jack, control shafts, etc.) to be sure the product is safe to operate without danger of electrical shock.

a) Dielectric Strength Test

The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed metal part having a return path to the chassis should withstand a voltage of 3000V AC (r.m.s.) for a period of one second. (. . . . Withstand a voltage of 1100V AC (r.m.s.) to an appliance rated up to 120V, and 3000V AC (r.m.s.) to an appliance rated 200V or more, for a period of one second.) This method of test requires a test equipment not generally found in the service trade.

b) Leakage Current Check

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Using a "Leakage Current Tester", measure the leakage current from each exposed metal part of the cabinet, particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water pipe, etc.). Any leakage current must not exceed 0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.2mA AC (r.m.s.).

Alternate Check Method

Plug the AC line cord directly into the AC outlet (do not use a line isolation transformer during this check.). Use

an AC voltmeter having 1000Ω per volt or more sensitivity in the following manner. Connect a 1500Ω 10W resistor paralleled by a 0.15µF AC-type capacitor

between an exposed metal part and a known good earth ground (water pipe, etc.). Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed metal part, particularly any exposed metal part having a return path to the chassis, and measure the AC voltage across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. Any voltage measured must not exceed 0.75V AC (r.m.s.). This corresponds to

0.5mA AC (r.m.s.). However, in tropical area, this must not exceed 0.3V AC (r.m.s.). This corresponds to 0.2mA AC (r.m.s.).

AC VOLTMETER (HAVING 1000 /V, OR MORE SENSITIVITY)

0.15 F AC-TYPE

GOOD EARTH GROUND

1500 10W

PLACE THIS PROBE ON EACH EXPOSED ME TAL PAR T

(No.YA213)1-3

1.2 INSTALLATION

1.2.1 HEAT DISSIPATION

If the heat dissipation vent behind this unit is blocked, cooling efficiency may deteriorate and temperature inside the unit will rise. The temperature sensor that protects the unit will be activated when internal temperature exceeds the pre-determined level and power will be turned off automatically.Therefore, please make sure pay attention not to block the heat dissipation vent as well as the ventilation outlet behind the unit and ensure that there is room for ventilation around it.

Ventilation hole

1.2.3 INSTALLATION REQUIREMENTS

To ensure safety in an emergency such as an earthquake, and to prevent accidents, ensure that measures are taken to prevent the TV dropping or falling over. Use the supplied screws to firmly attach the supplied hooks (OPTION) to the back of the TV, and use commercially available cord to fix the TV to rigid components such as walls and columns.

Wall

Hook

The hook for fall prevention(option)

It fixes in a band.

TV Stand

1.2.2 INSTALLATION REQUIREMENTS

Ensure that the minimal distance is maintained, as specified below, between the unit with and the surrounding walls, as well as the floor etc.Install the unit on stable flooring or stands.Take precautionary measures to prevent the unit from tipping in order to protect against accidents and earthquakes.

150 mm

200 mm

150 mm

200 mm

50 mm

*Diagram differs from actual appearance.

1.2.4 NOTES ON HANDLING

(1) WHEN TAKING UNIT OUT OF A PACKING CASE

When taking the unit out of a packing case, do not grasp the upper part of the unit. If you take the unit out while grasping the upper part, the LCD PANEL may be damaged because of a pressure. Instead of grasping the upper part, put your hands on the lower backside or sides of the unit.

(2) AS FOR PRESSING OR TOUCHING A SPEAKER

Be careful not to press the opening of the speaker in the lower part of the unit and around them since the decorative sheet on the surface of the openings may be deformed.

1-4 (No.YA213)

1.3 HANDLING LCD PANEL

1.3.1 PRECAUTIONS FOR TRANSPORTATION

When transporting the unit, pressure exerted on the internal LCD panel due to improper handling (such as tossing and dropping) may cause damages even when the unit is carefully packed. To prevent accidents from occurring during transportation, pay careful attention before delivery, such as through explaining the handling instructions to transporters. Ensure that the following requirements are met during transportation, as the LCD panel of this unit is made of glass and therefore fragile:

(1) USE A SPECIAL PACKING CASE FOR THE LCD PANEL

When transporting the LCD panel of the unit, use a special packing case (packing materials). A special packing case is used when a LCD panel is supplied as a service spare part.

(2) ATTACH PROTECTION SHEET TO THE FRONT

Since the front (display part) of the panel is vulnerable, attach the protection sheet to the front of the LCD panel before transportation. Protection sheet is used when a LCD panel is supplied as a service spare part.

(3) AVOID VIBRATIONS AND IMPACTS

The unit may be broken if it is toppled sideways even when properly packed. Continuous vibration may shift the gap of the panel, and the unit may not be able to display images properly. Ensure that the unit is carried by at least 2 persons and pay careful attention not to exert any vibration or impact on it.

(4) DO NOT PLACE EQUIPMENT HORIZONTALLY

Ensure that it is placed upright and not horizontally during transportation and storage as the LCD panel is very vulnerable to lateral impacts and may break. During transportation, ensure that the unit is loaded along the traveling direction of the vehicle, and avoid stacking them on one another. For storage, ensure that they are stacked in 2 layers or less even when placed upright.

1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL)

(1) Avoid placing the unit under direct sunlight over a

prolonged period of time. This may cause the optical filter to deteriorate in quality and color.

(2) Clean the filter surface by wiping it softly and lightly with a

soft and lightly fuzz cloth (such as outing flannel).

(3) Do not use solvents such as benzene or thinner to wipe the

filter surface. This may cause the filter to deteriorate in quality or the coating on the surface to come off. When cleaning the filter, usually use the neutral detergent diluted with water. When cleaning the dirty filter, use water-diluted ethanol.

(4) Since the filter surface is fragile, do not scratch or hit it with

hard materials. Be careful enough not to touch the front surface, especially when taking the unit out of the packing case or during transportation.

1.3.3 PRECAUTIONS FOR REPLACEMENT OF EXTERIOR PARTS

Take note of the following when replacing exterior parts (REAR COVER, FRONT PANEL, etc.):

(1) Do not exert pressure on the front of the LCD panel (filter

surface). It may cause irregular color.

(2) Pay careful attention not to scratch or stain the front of the

LCD panel (filter surface) with hands.

(3) When replacing exterior parts, the front (LCD panel) should

be placed facing downward. Place a mat, etc. underneath to avoid causing scratches to the front (filter surface).

(No.YA213)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

D.I.S.T. (Digital Image Scaling Technology)

This system uses line interpolation to double the number of scanning lines and achieve high resolution, flicker-free picture.

SMART CAPTION

Smart caption will appear when you press the MUTING button, only on channels where the broadcast contains CLOSED CAPTION information.

SMART SOUND

Decreases high sound levels, giving a regulated sound level.

VIDEO STATUS

Expression of a favorite screen can be chosen by the VIDEO STATUS function.

[STANDARD ↔ DYNAMIC ↔ THEATER ↔ GAME]

DIGITAL INPUT

Digital-in will display when any picture signal (480i/ 480p, 720p/ 1080i) in Digital-in is displayed.

V-CHIP

Since the V-CHIP is built in, it can choose, view and listen to a healthy program.

MTS STEREO

The voice multiplex function of the MTS system is built in. (MTS = Multi channel Television Sound system)

NATURAL CINEMA

Watching the movie or animation, press the Natural Cinema to adjust the out line of the images to make thin more sharp.

BBE

High definition audio adds natural, clear and extraordinary sound quality to any program.

VIDEO INPUT LABEL

This function is used to label video input connections for the onscreen displays.

A.H.S.

Adds a more spacious surround sound. Music gives basic effect and Movie for more effect.

1-6 (No.YA213)

2.2 TECHNICAL INFORMATION

2.2.1 LCD PANEL

This unit uses the flat type panel LCD (Liquid Crystal Display) panel that occupies as little space as possible, instead of the conventional CRT (Cathode Ray Tube), as a display unit. Since the unit has the two polarizing filter that are at right angles to each other, the unit adopts "normally black" mode, where light does not pass through the polarizing filter and the screen is black when no voltage is applied to the liquid crystals.

2.2.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications Remarks

Maximum dimensions ( W × H × D ) 646mm × 373mm × 51mm

Weight 8.0kg

Effective screen size Diagonal: 648mm (H:565mm × V : 318mm) 26V type

Aspect ratio 16 : 9

Drive device / system a-Si-TFT, active matrix system

Resolution Horizontally 1366 × Vertically 768 × RGB <W-XGA> 3147264 dots in total

Pixel pitch (pixel size) Horizontally:0.4135mm, Vertically:0.4135mm

Displayed color 16777216 colors 256 colors for R, G, and B

Brightness 500cd/m

Contrast ratio 800: 1

Response time 15ms

View angle Horizontally: 170°, Vertically: 170°

Surface polarizer Anti-Glare type, Low reflective coat

Color filter Vertical stripe

Backlight Cold cathode fluorescent lamp × 14

Power supply voltage in LCD 5V

Power supply voltage in inverter 12V

Panel interface system LVDS (Low Voltage Differential Signaling)

2.2.1.2 PIXEL FAULT

There are three pixel faults - bright fault , dark fault and flicker fault - that are respectively defined as follows.

(1) BRIGHT FAULT

In this pixel fault, a cell that should not light originally is lighting on and off. For checking this pixel fault, input ALL BLACK SCREEN and find out the cell that is lighting on and off.

(2) DARK FAULT

In this pixel fault, a cell that should light originally is not lighting or lighting with the brightness twice as brighter as originally lighting. For checking this pixel fault, input 100% of each R/G/B colour and find out the cell that is not lighting.

(3) FLICKER FAULT

In the pixel fault, a cell that should light originally or not light originally is flashing on and off. For checking this pixel fault, input ALL BLACK SCREEN signal or 100% of each RGB colour and find out the cell that is flashing on and off.

(No.YA213)1-7

2.2.2 MAIN CPU PIN FUNCTION [IC7601 : DIGITAL SIGNAL PWB ASS'Y]

Pin Pin name I/O Function Pin Pin name I/O Function

1 VHOLD1 I Data slice for main screen closed caption 51 NC O Not used

2 HFLT1 I/O LPF for main screen closed caption video input 52 NC O Not used

3 NC O Not used 53 NC O Not used

4 NC O Not used 54 NC O Not used

5 DIGR0 O R [0] for OSD 55 NC O Not used

6 TB1in I AC power for timer clock 56 NC O Not used

7 REMO I Remote control 57 NC O Not used

8 BYTE I Data bus width select [L = 16bit (fixed)] 58 NC O Not used

9 CNVss I CPU programming mode select [Normal = L] 59 NC O Not used

10 DIGG0 O G [0] for OSD 60 NC O Not used

11 DIGB0 O B [0] for OSD 61 NC O Not used

12 RESET I Reset for main CPU [Reset = L] 62 HSYNC I H. sync for OSD

13 Xout O System clock osillation (crystal) : 16MHz 63 NC O Not used

14 Vss - GND 64 VSYNC I V. sync for OSD

15 Xin I System clock osillation (crystal) : 16MHz 65 NC O Not used

16 VccI I 3.3V stand-by power supply 66 NC O Not used

17 OSC1 I Clock for OSD 67 NC O Not used

18 OSC2 O Not used : Clock for OSD 68 NC O Not used

19 INT1 I AV COMPULINK control 69 NC O Not used

20 INT0 I

21 OUT1 O Ys (blanking) for OSD 71 NC O Not used

22 OUT2 O YM (transparence) for OSD 72 NC O Not used

23 NC O Not used 73 NC O Not used

24 NC O Not used 74 NC O Not used

25 NC O Not used 75 NC O Not used

26 NC O Not used 76 NC O Not used

27 CTA2/RTS2 O Not used : Digital tuner control 77 NC O Not used

28 CLK2 O Not used : Digital tuner control 78 NC O Not used

29 RxD2 I Not used : Digital tuner control 79 NC O Not used

30 TxD2 O Not used : Digital tuner control 80 NC O Not used

31 SDA2 I/O Not used 81 NC O Not used

32 DIGR1 O R [1] for OSD 82 NC O Not used

33 DIGG1 O G [1] for OSD 83 NC O Not used

34 DIGB1 O B [1] for OSD 84 WAKE O Reset for sub(chassis) CPU

35 TxD0 I Data receive (serial) for external programming 85 CARD_DET I Not used : Card detection for ATSC digital tuner

36 RxD0 O Data transmission (serial) for external programming 86

37 CLK0 I Clock for external programming 87 NC I/O Data for Inter IC (serial) bus control : memory

38 RTS0 O Busy for external programming [Operation = H] 88 NC O Clock for Inter IC (serial) bus control : memory

39 P5.7 I Not used 89 DIGR2 O R [2] for OSD

40 P5.6 O Not used 90 DIGG2 O G [2] for OSD

41 HOLD I CPU programming mode select [Normal = H] 91 DIGB2 O B [2] for OSD

42 P5.4 O Not used 92 NC O Not used

43 P5.3 O Not used 93 KEY2 I

44 P5.2 O Not used 94 KEY1 I

45 P5.1 O Not used 95 VHOLD2 I Data slice for sub screen closed caption

46 WR O CPU programming mode select [Normal = L] 96 HLF2 I/O LPF for sub screen closed caption video input

47 P4.7 O

48 P4.6 I

49 P4.5 I Clock for sub(chassis) CPU communication (serial) 99 VCCE I 5V stand-by power supply

50 P4.4 O Not used 100 CVIN1 I Video(Y) for main screen closed caption

Request for sub(chassis) CPU communication (serial data)

Data transmission for sub(chassis) CPU communication (serial)

Data receive for sub(chassis) CPU communication (serial)

70 NC O Not used

POWER_SW

97 CVIN2 I Video(Y) for sub screen closed caption

98 TVSETB I Test terminal [L Fixed]

I Not used : Power switch (mechanical) detection

Key scan data for front control button (MENU/CH+/CH-) KEY2

Key scan data for front control button (VOL+/VOL-) KEY1

1-8 (No.YA213)

2.2.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 : DIGITAL SIGNAL PWB ASS'Y]

Pin Pin name I/O Function Pin Pin name I/O Function

1 LB_PRO O Not used 51 BS_TXD O

2 P_MU O Picture muting [Muting = H] 52 BS_RXD I Not used : Data receive for digital tuner communication

3 JP_CSB O Not used (NC) 53 NC O Not used (NC)

4 A_MU O Audio muting [Muting = H] 54 VREF+ I 3.3V power supply

5 M_MU O Audio muting (for AUDIO OUT) [Muting = H] 55 PDP_TX O

6 PC_SEL O Not used : RGB(PC) INPUT select 56 PDP_RX I Data receive for SUB (DRIVE) CPU communication

7 ON_TIMER O POWER INDICATOR (LED) brightness [LOW = L] 57 SDA0 I/O Data for Inter IC (serial) bus : EEP-ROM (IC7002)

8 ILA0 O Not used : LCD back light lighting 58 SCL0 O Clock for Inter IC (serial) bus : EEP-ROM (IC7002)

9 ILA1 O Not used : LCD panel overshoot refresh timing 59 SDA_DVI I/O

10 ILA2 O Not used 60 SCL_DVI O

11 POW_LED O POWER LED lighting [ON = H] 61 AVSS - GND

12 WORD O Not used 62 DIGII_PHOT I Photo sensor for DIGITAL-IN illegal copy protection

13 MI_CK I Clock for SUB (OSD) CPU communication 63 AGC I Not used

14 MI_TX I Data receive for SUB (OSD) CPU communication 64 EXT_YS1 I Not used

15 MI_RX O Data transmission for SUB (OSD) CPU communication 65 EXT_YS2 I Not used

16 MI_REQ O

17 VDD I 3.3V power supply 67 DIGI_PRO O for DIGITAL-IN (HDMI)

18 FOSC O Not used (NC) 68 GCR_RST O Not used (NC)

19 VSS - GND 69 GR_ON O Not used (NC)

20 X1 I Not used : Low speed oscillatior 70 SYNC_SEL O Not used : Sync select for digital tuner

21 X0 O Not used : Low speed oscillatior 71 NC O Not used (NC)

22 VDD I 3.3V power supply 72 NC O Not used (NC)

23 OSC1 I System clock osillation (crystal) : 16MHz 73 SBD5 I/O

24 OSC0 O System clock osillation (crystal) : 16MHz 74 SBT5 I

25 MODE I Single chip mode 75 NMI I 3.3V power supply

26 BS1.5CTL O Not used : Digital tuner power / reset control 76 COMP I AV COMPULINK lll control

27 A92RES O

28 BS_RST O Not used: Reset for Digital tuner power / reset control 78 VSYNC I V. sync pulse

29 LIP_RST O Not used: Reset for Sound delay (Lip sync) 79 WAKE I Reset for sub(chassis) CPU

30 SOFT_OFF O Not used 80

31 VMUTE I No use : Picture muting request from digital tuner 81 NC O Not used (NC)

32 VOUTENB O No use : Video cutoff for digital tuner 82 RST I Reset for MAIN CPU [Reset = L]

33 MDR_CON I No use : System cable connection monitor for PDP 83 VDD I 3.3V power supply

34 AVDD I 3.3V power supply 84 SCL3A O Clock for Inter IC (serial) bus control

35 BS_POW O Not used : Digital tuner power control 85 SDA3A I/O Data for Inter IC (serial) bus control

DsyncSW2

37 LB_POW O Not used : Power control for low bias line 87 SDA3B I/O Data for Inter IC (serial) bus control

38 NC O Not used (NC) 88

39 HOTPLUG I

40 MECA_SW I Mechanical monitor for POWER switch [Push = L] 90 DIGI_INT I Reset for HDMI process [Reset = ]

41 MAIN_POW O Main power control [ON = L] 91 DVI_RST O Not used : Reset for DVI format conversion

42 MSP_RST O AUDIO OUT output mode select [VARIABLE = L] 92 VSS - GND

43 VREF- I Not used 93 SCL5055 O

44 AFT2 I Not used : AFT voltage for sub tuner 94

45 AFT1 I AFT voltage for VHF/UHF tuner 95 SDA5055 I/O Data for Inter IC (serial) bus : JCC5055 (DIST process)

46 KEY2 I Key scan data for front switch (MENU/CH+/CH-) 96

47 KEY1 I Key scan data for front switch (VOL+/VOL-) 97 NC O Not used (NC)

48 NC O Not used (NC) 98 15K/OTH O Main video select [Fixed H]

49 NC O Not used (NC) 99 DsyncSW1 O Sync select for DIGITAL-IN [Cotrolled with 36-pin]

50 AC_IN I AC power pulse for timer clock 100 57 BUSY I Busy monitor for JCC5057 (New DIST process)

Data request for SUB (OSD) CPU communication [Request = L]

Reset for IC1001(3D YC SEP / COLOR DEMODULAT) [Reset = H]

O Sync select for DIGITAL-IN [Cotrolled with 99-pin] 86 SCL3B O Clock for Inter IC (serial) bus control

Not used : Video communiation monitor for receiver unit (PDP)

66 VDD I 3.3V power supply

77 REMO I Remote control

POWERGOOD

DIGI_SYNCSEL

89 DIGI_LRSW O For DIGITAL-IN (HDMI)

VFORMATSEL

OSD_MODE_SEL

Not used : Data transmission for digital tuner communication

Data transmission for SUB (DRIVE) CPU communication

Not used : Data for Inter IC (serial) bus for panel communication

Not used : Clock for Inter IC (serial) bus for panel communication

Not used : Data for writing on board (connect CN01P : for Frash ROM type)

Not used : Clock for writing on board (connect CN01P : for Frash ROM type)

I Power error detection [NG = H]

O Not used

Clock for Inter IC (serial) bus : JCC5055 (DIST process)

O Not used : Digital tuner clock control

O Not used : OSD mode select

(No.YA213)1-9

SECTION 3

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

DISASSEMBLY

3.1 SYSTEM SETTEING

When the DIGITAL SIGNAL PWB is replaced or the DIGITAL INPUT is not normal, SYSTEM SETTING in the following procedure.

(1) Set to 0 minutes using the [SLEEP TIMER] key. (2) Press the [VIDEO STATUS] key and [DISPLAY] key

simultaneously, then enter the SERVICE MODE.

(3) When the Main Menu is displayed, press [2] key to enter

the self check mode.

(4) Turn off the power by pressing the [POWER] key on the

remote control unit.

MAIN MENU SCREEN

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

SELF CHECK MODE SCREEN

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

3.2 DISASSEMBLY PROCEDURE

NOTE:

• Make sure that the power cord is disconnected from the outlet.

• Pay special attention not to break or damage the parts.

• When removing each board, remove the connectors as required. Taking notes of the connecting points (connector numbers) makes service procedure manageable.

• Make sure that there is no bent or stain on the connectors before inserting, and firmly insert the connectors.

CAUTION AT DISASSEMBLY

• Pay extra attention in the following matter when turning the power on with the REAR COVER removed. (1) Prior to disassembly, unplug the power cord from the AC

outlet without fail. (Turn the power "off".)

(2) Make sure that the RECEIVER PWB: IC3102 is

completely covered with black masking tape. (Fig.1)

(3) Make sure to remove the masking of RECEIVER

PWB: IC3102 when attaching the REAR COVER.

(4) Do not turn the power on until the REAR COVER is

attached properly, after the masking is removed.

RECEIVER PWB

Masking tape

SOLDER SIDE

IC3102

IC3101

Fig.1

1-10 (No.YA213)

3.2.1 REMOVING THE STAND

(1) Remove the 2 screws [A], Then remove the STAND

COVER.

(2) Remove the 4 screws [B], Then remove the STAND.

3.2.2 REMOVING THE REAR COVER

• Remove the STAND. (1) Remove the JACK COVER (L/R). (2) Remove the 7 screws [C], 4 screws [D], and 1 screws [E] . (3) Remove the REAR COVER.

CAUTION:

• Prior to starting the work, be sure to read the following

written instructions on the CAUTION LABEL attached to the REAR COVER.

3.2.3 REMOVING THE POWER PWB / REGULATOR PWB

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 5 screws [F], Then remove the FAN

BRACKET.

(2) Remove the 1 screw [G], Then remove the POWER CORD

HOLDER. (3) Remove the POWER CORD from the POWER PWB. (4) Remove the REGULATOR PWB. (5) Remove the 5 screw [H], Then remove the POWER PWB.

3.2.4 REMOVING THE ANALOG SYGNAL PWB

• Remove the STAND.

• Remove the REAR COVER.

• Remove the FAN BRACKET. (1) Remove the 6 screws [J] Then remove the TERMINAL

BASE.

(2) Remove the 6 screws [K] Then remove the ANALOG

SYGNAL PWB.

3.2.5 REMOVING THE FRONT CONTROL PWB CONTROL / FRONT SENSOR PWB

• Remove the STAND.

• Remove the REAR COVER.

(1) Remove the 2 screws [L], Then remove the CONTROL

KNOB ASSY.

(2) Remove the 2 screws [M], Then remove the FRONT

CONTROL PWB.

(3) Remove the FRONT SENSOR PWB.

3.2.6 REMOVING THE RECEIVER PWB / CONNECTOR PWB

• Remove the STAND.

• Remove the REAR COVER.

(1) Remove the 4 screws [O] Then remove the RECEIVER

PWB.

(2) Remove the 4 screws [P] Then remove the RECEIVER

PWB BRACKET.

(3) Remove the 2 screws [Q] Then remove the CONNECTOR

PWB.

3.2.7 REMOVING THE DIGITAL SYGNAL PWB

• Remove the STAND.

• Remove the REAR COVER.

(1) Remove the 3 screws [R] and 1 screw [S], Then remove

the TUNER BASE.

(2) Remove the 5 screws [T], Then remove the DIGITAL

SIGNAL PWB.

CAUTION:

Make sure to perform the "SYSTEM SETTING" on page 1-10, when DIGITAL SIGNAL PWB is replaced.

3.2.8 REMOVING THE SPEAKER

• Remove the STAND.

• Remove the REAR COVER.

(1) Remove the 5 screws [a], Then remove the SPEAKER

BOX. (2) Remove the 4 screws [b], Then remove the SPEAKER (L /R). (3) Remove the 4 screws [c], Then remove the DUCT(L/R).

NOTE:

Since the speaker is attached in a certain direction, attach the speaker in the same correct direction as it has been attached.

3.2.9 REMOVING THE LCD PANEL UNIT

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 6 screws [d] and 4 screws [e]. (2) Remove the LCD PANEL UNIT. (3) Remove the 7 screws [f]. Then, remove the MAIN BASE. (4) Remove the 2 screws [g]. Then, remove the TOP FRAME. (5) Remove the 2 screws [h]. Then, remove the BOTTOM

FRAME.

(No.YA213)1-11

JACK COVER

STAND COVER

REAR COVER

REGULATOR PWB

INSULATOR

POWER PWB

ANALOG SIGNAL PWB

STAND

FAN BRACKET

RECEIVER PWB

POWER CORD

TUNER BASE

POWER CORD

HOLDER

RECEIVER PWB BRACKET

CONNECTOR PWB

TERMINAL BASE

1-12 (No.YA213)

FRONT CONTROL PWB

FRONT SENSOR PWB

CONTROL KNOB ASSY

DIGITAL SIGNAL PWB

FRONT

Fig.2

INVERTER SHIELD

MAIN BASE

TOP FRAME

LCD PANEL UNIT

BOTTOM FRAME

SPEAKER BOX

DUCT

DUCT SHEET

FRONT PANEL

FRONT

Fig.3

DUCT

DUCT SHEET

SPEAKER

(No.YA213)1-13

3.3 MEMORY IC REPLACEMENT

S001 PREPARE 000 NTSC3 1409 DYN H

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

• This model uses the memory IC.

• This memory IC stores data for proper operation of the video and drive circuits.

• When replacing, be sure to use an IC containing this (initial value) data.

3.3.1 MEMORY IC REPLACEMENT PROCEDURE

1. Power off

Switch off the power and disconnect the power plug from the AC outlet.

2. Replace the memory IC

Be sure to use the memory IC written with the initial setting values.

3. Power on

Connect the power plug to the AC outlet and switch on the power.

4. Receiving channel setting

Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.

5. User setting

Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING INSTRUCTIONS and set the items as described.

6. SERVICE MODE setting

Verify what to set in the SERVICE MODE, and set whatever is necessary (Fig.1). Refer to the SERVICE ADJUSTMENT for setting.

3.3.2 SERVICE MODE SETTING

SERVICE MODE SCREEN

MAIN MENU SCREEN

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

SETTING ITEM

Setting items Settings Item No.

Video sytetem setting Adjust S001 to S039

Audio sytetem setting Adjust T001 to T010

Panel control sytetem setting Fixed P001 to P010

Drive sytetem setting Fixed D001 to D187

Main cpu system setting Fixed Z001 to Z010

ADJUSTMENT MODE SCREEN

S001 PREPARE 000 NTSC3 1409 DYN H

Fig.1

1-14 (No.YA213)

3.3.3 SETTINGS OF FACTORY SHIPMENT

3.3.3.1 BUTTON OPERATION 3.3.3.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

CHANNEL CABLE-02

VOLUME 10

3.3.3.3 REMOTE CONTROL MENU OPERATION

1. PICTURE ADJUST

Customers can adjust the picture setting of menu screen as their own like but the picture standard value during factory shipment is as below.

< NTSC MODE >

Setting item

PICTURE 00 00 00 00 BRIGHT 00 00 00 00 COLOR +10 00 -10 00 TINT 00 00 00 00 DETAIL +05 00 00 00 ENERGY SAVER MODE COLOR TEMPERATURE DIG. NOISE CLEAR OFF OFF OFF OFF NATURAL CINEMA AUTO AUTO AUTO AUTO COLOR MANAGEMENT DYNAMIC GAMMA ON ON ON ON

< HD MODE >

Setting item

PICTURE 00 00 00 00 BRIGHT 00 00 00 00 COLOR +05 00 -10 00 TINT 00 00 00 00 DETAIL +05 00 00 00 ENERGY SAVER MODE COLOR TEMPERATURE DIG. NOISE CLEAR OFF OFF OFF OFF NATURAL CINEMA AUTO AUTO AUTO AUTO COLOR MANAGEMENT DYNAMIC GAMMA ON ON ON ON

DYNAMIC

+30 +20 00 00

HIGH LOW HIGH HIGH

DYNAMIC

+30 +20 00 00

HIGH LOW HIGH HIGH

STANDARD

ON ON ON ON

STANDARD

ON ON ON ON

GAME

THEATER

INPUT TV

CHANNEL CABLE-02

VOLUME 10

MUTING OFF

DISPLAY OFF

ASPECT NTSC PANORAMA

SLEEP TIMER OFF

THEATER PRO OFF

VIDEO STATUS DYNAMIC

SOUND EFFECT

2. SOUND ADJUST

BASS 00

TREBLE 00

BALANCE 00

MTS STEREO

3. CLOCK / TIMERS

SET CLOCK OFF

ON / OFF TIMER OFF

4. INITIAL SETUP

DIGITAL-IN

DIGITAL-AUDIO

NOISE MUTING ON

FRONT PANEL LOCK OFF

V1 SMART INPUT OFF

VIDEO INPUT LABEL All blank

POSITION ADJUSTMENT Center

POWER INDICATOR OFF

LANGUAGE ENG.

CLOSED CAPTION OFF

AUTO SHUT OFF OFF

XDS ID OFF

V-CHIP OFF

AUTO DEMO OFF

Setting item Setting position

HD FULL

A.H.S OFF

BBE ON

SMART SOUND OFF [LT-26X585]

A.H.B OFF

Setting item Setting position

SIZE 1

DIGITAL

(No.YA213)1-15

3.4 REPLACEMENT OF CHIP COMPONENT

3.4.1 CAUTIONS

(1) Avoid heating for more than 3 seconds. (2) Do not rub the electrodes and the resist parts of the pattern. (3) When removing a chip part, melt the solder adequately. (4) Do not reuse a chip part after removing it.

3.4.2 SOLDERING IRON

(1) Use a high insulation soldering iron with a thin pointed end of it. (2) A 30w soldering iron is recommended for easily removing parts.

3.4.3 REPLACEMENT STEPS

1. How to remove Chip parts

2. How to install Chip parts

[Resistors, capacitors, etc.]

(1) As shown in the figure, push the part with tweezers and

alternately melt the solder at each end.

(2) Shift with the tweezers and remove the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply extra solder to each lead.

SOLDER

[Resistors, capacitors, etc.]

(1) Apply solder to the pattern as indicated in the figure.

(2) Grasp the chip part with tweezers and place it on the

solder. Then heat and melt the solder at both ends of the chip part.

[Transistors, diodes, variable resistors, etc.]

(1) Apply solder to the pattern as indicated in the figure. (2) Grasp the chip part with tweezers and place it on the

solder.

(3) First solder lead A as indicated in the figure.

(2) As shown in the figure, push the part with tweezers and

alternately melt the solder at each lead. Shift and remove the chip part.

NOTE :

After removing the part, remove remaining solder from the pattern.

1-16 (No.YA213)

(4) Then solder leads B and C.

SECTION 4

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

S001 PREPARE 000 NTSC3 1409 DYN H

ADJUSTMENT

4.1 ADJUSTMENT PREPARATION

(1) There are 2 ways of adjusting this TV : One is with the

REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.

(2) The adjustment using the REMOTE CONTROL UNIT is

made on the basis of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.

(3) Make sure that connection is correctly made AC to AC

power source.

(4) Turn on the power of the TV and measuring instruments for

warning up for at least 30 minutes before starting adjustments.

(5) If the receive or input signal is not specified, use the most

appropriate signal for adjustment.

(6) Never touch the parts (such as variable resistors,

transformers and condensers) not shown in the adjustment items of this service adjustment.

4.2 PRESET SETTING BEFORE ADJUSTMENTS

Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.

Setting item Settings

VIDEO STATUS STANDARD

BRIGHT / CONTRAST / COLOR / TINT

COLOR TEMPERATURE LOW

DIG. NOISE CLEAR OFF

COLOR MANAGEMENT ON

NATURAL CINEMA OFF

TREBLE / BASS / BALANCE 00

BBE OFF

A.H.S OFF

A.H.B OFF

ASPECT FULL

4.5 BASIC OPERATION OF SERVICE MODE

4.5.1 HOW TO ENTER THE SERVICE MODE

(1) Set to 0 minutes using the [SLEEP TIMER] key. (2) Press the [VIDEO STATUS] key and [DISPLAY] key

simultaneously, then enter the SERVICE MODE mode.

(3) When the MAIN MENU SCREEN is displayed, press [1]

key to enter the adjustment mode.

NOTE:

• Before entering the SERVICE MODE, confirm that the

setting of TV / CATV switch of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR / DVD switch is at the "VCR" side. If the switches have not been properly set, you cannot enter the SERVICE MODE.

• When a number key other than the [1] to [3] key is pressed

in the MAIN MENU SCREEN, the other relevant screen may be displayed. This is not used in the adjustment procedure. Press the [MENU] key to return to the MAIN MENU SCREEN.

MAIN MENU SCREEN

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

ADJUSTMENT MODE SCREEN

S001 PREPARE 000 NTSC3 1409 DYN H

4.3 MEASURING INSTRUMENT AND FIXTURES

• Oscilloscope

• Signal generator (Pattern generator) [NTSC / 525i / 525p / 750p / 1125i / DIGITAL]

• TV audio multiplex signal generator

• Remote control unit

4.4 ADJUSTMENT ITEMS

 VIDEO CIRCUIT

• 525i A-D OFFSET adjustment

• 1125i BRIGHTNESS adjustment

• 1125i A-D OFFSET adjustment

• SUB SCREEN A-D OFFSET adjustment

• WHITE BALANCE (HIGHLIGHT) adjustment

 MTS CIRCUIT

• MTS INPUT LEVEL adjustment

• MTS SEPARATION adjustment

4.5.2 HOW TO EXIT THE SERVICE MODE

Press the [ BACK ] key to exit the Service mode.

(No.YA213)1-17

4.5.3 DESCRIPTION OF STATUS DISPLAY

S001 PREPARE 000 NTSC3 1409 DYN H

SETTING VALUE (DATA)SETTINGITEM No. SETTING ITEM

S001 PREPARE 000 NTSC3 1409 DYN H

WHITE BALANCE

(6) SETTING ITEM NO.

Setting item numbers are displayed. For the setting item names to be displayed, refer to "Initial setting value of adjustment mode".

(7) SETTING VALUE (DATA)

The SETTING VALUE is displayed.

4.5.4 CHANGE AND MEMORY OF SETTING VALUE

SELECTION OF SETTING ITEM

• [CHANNEL (+/-)] key. For scrolling up / down the setting items.

SIGNAL SYSTEM

SCREEN MODE

VIDEO STATUS

(1) SIGNAL SYSTEM

The signal displayed on the screen is displayed.

NTSC3 : 525i (Composite / S-video input) 525I : 525i (Component input) 525P : 525p 1125I6 : 1125i 750P : 750p H525I : HDMI 525i H525P : HDMI 525p H125I6 : HDMI 1125i H750P : HDMI 750p

(2) SCREEN MODE

State of the SCREEN SIZE or MULTI PICTURE is displayed.

SINGLE SCREEN

1409 : FULL 1609 : PANORAMA, HD PANORAMA 1609S : CINEMA, CINEMA ZOOM FULL : REGULAR

MULTI SCREEN

M12 : FREEZE screen FRZ : TWIN screen STD : INDEX screen

(3) VIDEO STATUS

STD : STANDARD DYN : DYNAMIC TH : THEATER GAME : GAME

S001... ↔ T001... ↔ P001... ↔ D001... ↔ Z001...

• [SLEEP TIMER] key. For switching to next items.

S001 → T001 → P001 → D001 → Z001

CHANGE OF SETTING VALUE (DATA)

• [VOLUME (+/-)] key. For scrolling up / down the setting values.

MEMORY OF SETTING VALUE (DATA)

Changed setting value is memorized by pressing [MUTING] key.

4.5.5 SERVICE MODE SELECT KEY LOCATION

VCR/DVD switch

TV/CATV switch

DISPLAY

SLEEP TIMER

VIDEO STATUS

MUTING

VOLUME -

POWER

NUMBER

CHANNEL +

VOLUME +

BACK

CHANNEL -

(4) WHITE BALANCE

H: HIGH M: LOW

(5) SETTING ITEM NAME

Setting item name are displayed. The setting item numbers to be displayed are listed below.

Item No. Setting item S001 to S039 Video sytetem setting T001 to T010 Audio sytetem setting P001 to P010 Panel control sytetem setting D001 to D187 Drive sytetem setting Z001 to Z010 Main cpu system setting

1-18 (No.YA213)

RM-C1257G

4.6 INITIAL SETTING VALUES IN THE SERVICE MODE

• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.

• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". They are fixed values.

4.6.1 VIDEO SYSTEM SETTING 4.6.2 AUDIO SYSTEM SETTING

Item No. Item name Variable range Setting value

S001 PREPARE 000 to 031 000

S002 NTSC BL 000 to 015 000

S003 NTSC CNT 000 to 255 036

S004 NT CR OF 000 to 015 006

S005 NT CB OF 000 to 015 006

S006 525i BL 000 to 015 000

S007 525i CNT 000 to 255 044

S008 5i CB OF 000 to 015 000

S009 5i CR OF 000 to 015 000

S010 5i CR GN 000 to 015 006

S011 5i CB GN 000 to 015 006

S012 HD BL 000 to 063 056

S013 HD CB OF 000 to 063 055

S014 HD CR OF 000 to 063 058

S015 RT CONT 000 to 015 007

S016 RT CB OF 000 to 015 005

S017 RT CR OF 000 to 015 007

S018 RT CL GA 000 to 015 012

S019 PC CL MB 000 to 007 000

S020 PC CL LB 000 to 031 000

S021 PC CL MR 000 to 071 000

S022 PC CL LR 000 to 031 000

S023 (Not display) 000 to 255 000

S024 (Not display) 000 to 255 000

S025 (Not display) 000 to 255 000

S026 (Not display) 000 to 255 000

S027 (Not display) 000 to 255 000

S028 (Not display) 000 to 255 000

S029 (Not display) 000 to 255 000

S030 R DRIVE 000 to 255 130

S031 G DRIVE 000 to 255 133

S032 B DRIVE 000 to 255 090

S033 (Not display) 000 to 255 000

S034 (Not display) 000 to 255 000

S035 (Not display) 000 to 255 000

S036 (Not display) 000 to 255 000

S037 (Not display) 000 to 255 000

S038 (Not display) 000 to 255 000

S039 ILA COM +00 to +01 +00

Item No. Item name Variable range Setting value

T001 IN LEVEL 000 to 255 255

T002 LOW SEP 000 to 255 199

T003 HIGH SEP 000 to 255 255

T004 AFC 000 to 255 000

T005 (Not display) 000 to 255 000

T006 ATT V ON 000 to 001 000

T007 ATT U ON 000 to 001 000

T008 ATT C ON 000 to 001 000

T009 (Not display) 000 to 255 000

T010 (Not display) 000 to 255 000

4.6.3 PANEL CONTOROL SYSTEM SETTING (*Fixed values)

Item No. Item name Variable range Setting value

P001 TM HOR H 00 to FF 00

P002 TM HOR L 00 to FF 00

P003 TM MIN 00 to FF 00

P004 TEMP0 000 to 255 000

P005 (Not display) 000 to 255 000

P006 (Not display) 000 to 255 000

P007 (Not display) 000 to 255 000

P008 (Not display) 000 to 255 000

P009 (Not display) 000 to 255 000

P010 (Not display) 000 to 255 000

4.6.4 DRIVE SYSTEM SETTING (*Fixed values)

Item No. Item name Variable range Setting value

D001 SLV GN 00 to 3F 15

D002 SLVH GN 00 to 3F 13

D003 SLH GN 00 to 3F 15

D004 SLV Pf 00 to 03 01

D005 SLH Pf H 00 to 01 01

D006 SLH Pf L 00 to 03 01

D007 SL EGCON 00 to 3F 08

D008 SL EGONF 00 to 01 01

D009 SL CRGON 00 to 3F 06

D010 SL CRGON 00 to 01 01

D011 SL ON OF 00 to 01 01

D012 SV GN 00 to 3F 18

D013 SVH GN 00 to 3F 1A

D014 SH GN 00 to 3F 1C

D015 SV Pf 00 to 03 00

D016 SV PfH 00 to 01 01

(No.YA213)1-19

Item No. Item name Variable range Setting value

D017 SV PfL 00 to 03 00

D018 SYL CON 00 to 3F 30

D019 SYL CONF 00 to 01 01

D020 SYH CON 00 to 3F 00

D021 SYH CONF 00 to 01 01

D022 SC CON 00 to 3F 1A

D023 SC CNONF 00 to 01 01

D024 SPM BLC 00 to 3F 0A

D025 SPM BLCO 00 to 01 01

D026 SLIM 00 to 3F 20

D027 SLIMONF 00 to 01 01

D028 SCRG 00 to 3F 24

D029 SRGONF 00 to 01 01

D030 S ONF 00 to 01 01

D031 pb GN 00 to 3F 15

D032 pb PfH 00 to 01 01

D033 pb PfL 00 to 03 00

D034 pb CRG 00 to 3F 04

D035 pb CRGON 00 to 01 01

D036 pb ONF 00 to 01 01

D037 pr GN 00 to 3F 15

D038 pr PfH 00 to 01 01

D039 pr PfL 00 to 03 00

D040 pr CRG 00 to 3F 05

D041 pr CRGON 00 to 01 01

D042 pr ONF 00 to 01 01

D043 ENH ONF 00 to 01 01

D044 (Not display) 00 to FF 00

D045 (Not display) 00 to FF 00

D046 (Not display) 00 to FF 00

D047 (Not display) 00 to FF 00

D048 (Not display) 00 to FF 00

D049 (Not display) 00 to FF 00

D050 (Not display) 00 to FF 00

D051 (Not display) 00 to FF 00

D052 (Not display) 00 to FF 00

D053 (Not display) 00 to FF 00

D054 (Not display) 00 to FF 00

D055 (Not display) 00 to FF 00

D056 (Not display) 00 to FF 00

D057 (Not display) 00 to FF 00

D058 (Not display) 00 to FF 00

D059 (Not display) 00 to FF 00

D060 (Not display) 00 to FF 00

D061 (Not display) 00 to FF 00

D062 (Not display) 00 to FF 00

Item No. Item name Variable range Setting value

D063 (Not display) 00 to FF 00

D064 (Not display) 00 to FF 00

D065 (Not display) 00 to FF 00

D066 (Not display) 00 to FF 00

D067 (Not display) 00 to FF 00

D068 (Not display) 00 to FF 00

D069 (Not display) 00 to FF 00

D070 (Not display) 00 to FF 00

D071 (Not display) 00 to FF 00

D072 (Not display) 00 to FF 00

D073 (Not display) 00 to FF 00

D074 (Not display) 00 to FF 00

D075 (Not display) 00 to FF 00

D076 (Not display) 00 to FF 00

D077 (Not display) 00 to FF 00

D078 (Not display) 00 to FF 00

D079 (Not display) 00 to FF 00

D080 (Not display) 00 to FF 00

D081 (Not display) 00 to FF 00

D082 (Not display) 00 to FF 00

D083 (Not display) 00 to FF 00

D084 (Not display) 00 to FF 00

D085 (Not display) 00 to FF 00

D086 (Not display) 00 to FF 00

D087 (Not display) 00 to FF 00

D088 (Not display) 00 to FF 00

D089 (Not display) 00 to FF 00

D090 (Not display) 00 to FF 00

D091 (Not display) 00 to FF 00

D092 (Not display) 00 to FF 00

D093 (Not display) 00 to FF 00

D094 (Not display) 00 to FF 00

D095 (Not display) 00 to FF 00

D096 (Not display) 00 to FF 00

D097 (Not display) 00 to FF 00

D098 (Not display) 00 to FF 00

D099 (Not display) 00 to FF 00

D101 (Not display) 00 to FF 00

D102 (Not display) 00 to FF 00

D103 (Not display) 00 to FF 00

D104 (Not display) 00 to FF 00

D105 (Not display) 00 to FF 00

D106 (Not display) 00 to FF 00

D107 (Not display) 00 to FF 00

D108 (Not display) 00 to FF 00

D109 (Not display) 00 to FF 00

1-20 (No.YA213)

Item No. Item name Variable range Setting value

D110 (Not display) 00 to FF 00

D111 (Not display) 00 to FF 00

D112 (Not display) 00 to FF 00

D113 (Not display) 00 to FF 00

D114 (Not display) 00 to FF 00

D115 (Not display) 00 to FF 00

D116 (Not display) 00 to FF 00

D117 (Not display) 00 to FF 00

D118 (Not display) 00 to FF 00

D119 (Not display) 00 to FF 00

D120 (Not display) 00 to FF 00

D121 (Not display) 00 to FF 00

D122 (Not display) 00 to FF 00

D123 (Not display) 00 to FF 00

D124 (Not display) 00 to FF 00

D125 (Not display) 00 to FF 00

D126 (Not display) 00 to FF 00

D127 (Not display) 00 to FF 00

D128 (Not display) 00 to FF 00

D129 (Not display) 00 to FF 00

D130 (Not display) 00 to FF 00

D131 (Not display) 00 to FF 00

D132 (Not display) 00 to FF 00

D133 (Not display) 00 to FF 00

D134 (Not display) 00 to FF 00

D135 (Not display) 00 to FF 00

D136 (Not display) 00 to FF 00

D137 (Not display) 00 to FF 00

D138 (Not display) 00 to FF 00

D139 (Not display) 00 to FF 00

D140 (Not display) 00 to FF 00

D141 (Not display) 00 to FF 00

D142 (Not display) 00 to FF 00

D143 (Not display) 00 to FF 00

D144 (Not display) 00 to FF 00

D145 (Not display) 00 to FF 00

D146 (Not display) 00 to FF 00

D147 (Not display) 00 to FF 00

D148 (Not display) 00 to FF 00

D149 (Not display) 00 to FF 00

D150 (Not display) 00 to FF 00

D151 (Not display) 00 to FF 00

D152 (Not display) 00 to FF 00

D153 (Not display) 00 to FF 00

D154 (Not display) 00 to FF 00

D155 (Not display) 00 to FF 00

Item No. Item name Variable range Setting value

D156 (Not display) 00 to FF 00

D157 (Not display) 00 to FF 00

D158 (Not display) 00 to FF 00

D159 (Not display) 00 to FF 00

D160 (Not display) 00 to FF 00

D161 (Not display) 00 to FF 00

D162 (Not display) 00 to FF 00

D163 (Not display) 00 to FF 00

D164 (Not display) 00 to FF 00

D165 (Not display) 00 to FF 00

D166 (Not display) 00 to FF 00

D167 (Not display) 00 to FF 00

D168 (Not display) 00 to FF 00

D169 (Not display) 00 to FF 00

D170 (Not display) 00 to FF 00

D171 (Not display) 00 to FF 00

D172 (Not display) 00 to FF 00

D173 (Not display) 00 to FF 00

D174 (Not display) 00 to FF 00

D175 (Not display) 00 to FF 00

D176 (Not display) 00 to FF 00

D177 (Not display) 00 to FF 00

D178 (Not display) 00 to FF 00

D179 (Not display) 00 to FF 00

D180 (Not display) 00 to FF 00

D181 (Not display) 00 to FF 00

D182 (Not display) 00 to FF 00

D183 (Not display) 00 to FF 00

D184 (Not display) 00 to FF 00

D185 (Not display) 00 to FF 00

D186 (Not display) 00 to FF 00

D187 (Not display) 00 to FF 00

4.6.5 MAIN CPU SYETEM SETTING (*Fixed values)

Item No. Item name Variable range Setting value

Z001 (Not display) 00 to FF 00

Z002 (Not display) 00 to FF 00

Z003 (Not display) 00 to FF 00

Z004 (Not display) 00 to FF 00

Z005 (Not display) 00 to FF 00

Z006 (Not display) 00 to FF 00

Z007 (Not display) 00 to FF 00

Z008 (Not display) 00 to FF 00

Z009 (Not display) 00 to FF 00

Z010 (Not display) 00 to FF 00

(No.YA213)1-21

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT

Item

525i A-D OFFSET

Measuring

instrument

Remote control unit

Test point Adjustment part Description

Signal generator

Disappears the color at both ends.

[1.ADJUST] S001: PREPARE (Adjustment setting mode change)

S008: 5i CB OF(525i cb offset) S009: 5i CR OF(525i cr offset)

S030: R DRIVE(Red drive) S031: G DRIVE(Green drive) S032: B DRIVE(Blue drive)

(1) Receive a 525i component ramp pattern signal. (2) Set “VIDEO STATUS” to STANDARD. (3) Set “ASPECT” to FULL. (4) St "COLOR TEMPERATURE" to LOW. (5) Select "1.ADJUST" from the SERVICE MODE. (6) Set < S030 > (R DRIVE), < S031> (G DRIVE)

and < S032 > (B DRIVE) to "255".

(7) Set < S001 >(adjustment setting mode change)

to set "008" and it change to the 525i A-D offset adjustment setting mode.

(8) Set < S008 > (525i Cb offset) and < S09 > (525i

Cr offset) to lose the gap (red line, green line and blue line) which appears at both ends of a white part at the center of the screen.

(9) Set < S001 > to set “000“ and it change to the

normal mode.

(10) Press the [MUTING] key to memoirze the set

value.

1125i BRIGHTNESS

Remote control unit

Signal generator

Set the 0% black part to be brightest.

[1.ADJUST] S001: PREPARE (Adjustment setting mode change)

S012: HD BL(1125i brightness)

S030: R DRIVE(Red drive) S031: G DRIVE(Green drive) S032: B DRIVE(Blue drive)

(1) Receive a 1125i gray scale pattern signal . (2) Set “VIDEO STATUS” to STANDARD. (3) Set “ASPECT” to FULL. (4) Set "COLOR TEMPERATURE" to LOW. (5) Select "1.ADJUST" from the SERVICE MODE. (6) Set < S030 > (R DRIVE), < S031> (G DRIVE)

and < S032 > (B DRIVE) to "255".

(7) Set < S001 > (adjustment setting mode change)

to set the values “012“ and it change to the 1125i black level adjustment setting mode.

(8) Set < S012 > (1125i brightness) to set the 0%

black part in the upper half of the screen to be brightest.

(9) Set < S001 > to set “000“ and it change to the

normal mode.

(10) Press the [MUTING] key to memoirze the set

value.

1-22 (No.YA213)

Item

1125i A-D OFFSET

Measuring

instrument

Remote control unit

Test point Adjustment part Description

[1.ADJUST] S001: PREPARE

(Adjustment setting mode change) Signal generator

S013: HD CB OF(1125i cb offset)

S014: HD CR OF(1125i cr offset)

S030: R DRIVE(Red drive)

S031: G DRIVE(Green drive)

S032: B DRIVE(Blue drive)

Minimize the red and blue noises in the upper half of the screen.

(1) Receive a 1125i 30% all white pattern signal. (2) Set “VIDEO STATUS” to STANDARD. (3) Set “ASPECT” to FULL. (4) Set "COLOR TEMPERATURE" to LOW. (5) Select "1.ADJUST" from the SERVICE MODE. (6) Set < S030 > (R DRIVE), < S031> (G DRIVE)

and < S032 > (B DRIVE) to "255".

(7) Set < S001 > (adjustment setting mode change)

to set “013“ and it change to the 1125i A-D offset adjustment setting mode.

(8) Set < S013 > (1125i Cb offset) to minimize the

blue noise in the upper half of the screen.

(9) Set < S014 > (1125i Cr offset) to minimize the

blue noise in the upper half of the screen.

(10) Set < S001 > to set “000“ and it change to the

normal mode.

(11) Press the [MUTING] key to memoirze the set

value.

SUB SCREEN A-D OFFSET

Remote control unit

Signal generator

Set the 0% block part to be brightest.

VIDEO-1

<30% all white>

[1.ADJUST]

S001: PREPARE

(Adjustment setting mode change)

S016: RT CB OF

(Sub screen cb offset)

S017: RT CR OF

(Sub screen cr offset)

S030: R DRIVE(Red drive)

S031: G DRIVE(Green drive)

S032: B DRIVE(Blue drive)

TV(RF)

(1) Set “VIDEO STATUS” to STANDARD. (2) Set “ASPECT” to FULL. (3) Set "COLOR TEMPERATURE" to LOW. (4) Set "MULTI SCREEN" to TWIN. (5) Receive a NTSC 30% all white pattern signal on

the Right screen. At the same time, set the Left

screen in VIDEO-1 mode (No signal). (6) Select "1.ADJUST" from the SERVICE MODE. (7) Set < S030 > (R DRIVE), < S031> (G DRIVE)

and < S032 > (B DRIVE) to "255". (8) Set < S001 > (adjustment setting mode change)

to set “017“ and it change to the sub screen A-

D offset adjustment setting mode. (9) Set < S016 > (Sub screen cb offset) to minimize

the blue noise in the upper half of the screen.

If you select an adjustment item < S016 >,

then the screen automatically turn to twin

pictures mode.

(10) Set < S017 > (Sub screen cr offset) to minimize

the red noise in the upper half of the screen.

(11) Readjust < S016 > and < S017 > to set the

upper half of the screen to be the blackest. (See

Fig.9)

(12) Set < S001 > to set “000“ and it change to the

normal mode.

(13) Press the [MUTING] key to memoirze the set

value.

(No.YA213)1-23

Item

WHITE BALANCE

instrument

Remote control unit

(HIGHLIGHT)

Signal generator

4.7.2 MTS CIRCUIT

Measuring

Test point Adjustment part Description

[1.ADJUST] S030: R DRIVE (Red drive) S031: G DRIVE (Green drive) S032: B DRIVE (Blue drive)

(1) Receive a NTSC 75% all white signal. (2) Set "VIDEO STATUS" to STANDARD. (3) Set "ASPECT" to FULL. (4) Select "COLOR TEMPERATURE" to LOW. (5) Select "1.ADJUST" from the SERVICE MODE. (6) Keep one of < S030 > (Red drive), < S031 >

(Green drive) or < S032 > (Blue drive) unchanged, then lower the other two so that the all-white screen is equally white throughout.

NOTE:

Set one or more of < S030 >, < S031 >, and < S032 > to "255".

(7) Check that white balance is properly tracked

from low light to high light. If the white balance tracking is deviated, adjust to correct it.

(8) Press the [MUTING] key to memoirze the set

value.

Item

MTS INPUT LEVEL

MTS SEPARATION

Measuring

instrument

Remote control unit

Signal generator

TV audio multiplex signal generator

Oscilloscope

Remote control unit

L-Channel signal waveform

1 cycle

Test point Adjustment part Description

[1.ADJUST] T001: IN LEVEL

(1) Receive the any broadcast. (2) Select "1.ADJUST" from the SERVICE MODE. (3) Verify that the < T001 > (IN LEVEL) is set at its

initial setting value.

(4) Press the [MUTING] key to memorize the set

value.

L OUT R OUT

[1.ADJUST] T002: LOW SEP T003: HI SEP

(1) Input the stereo L signal (300Hz) from the TV

audio multiplex signal generator to the antenna terminal.

(2) Connect an oscilloscope to L OUT pin of the

MONITOR OUT, and display one cycle portion of the 300Hz signal.

(3) Change the connection of the oscilloscope to R

OUT pin of the MONITOR OUT, and enlarge the

voltage axis. (4) Select "1.ADJUST" from the SERVICE MODE. (5) Set the initial setting value of the < T002 > (LOW

R-Channel crosstalk portion

Minimum

SEP). (6) Adjust the < T002 > so that the stroke element

of the 300Hz signal will become minimum. (7) Change the signal to 3kHz, and similarly adjust

the < T003> (HI SEP). (8) Press the [MUTING] key to memorize the set

value.

1-24 (No.YA213)

SECTION 5

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

FAN OK ALM OK TMP OK ATP OK ASH OK

PNL OK MEM OK TMP OK AIO OK

TROUBLESHOOTING

5.1 SELF CHECK FEATURE

5.1.1 OUTLINE

This unit comes with the "Self check" feature, which checks the operational state of the circuit and displays/saves it during failure.Diagnosis is performed when power is turned on, and information input to the main microcomputer is monitored at all time.Diagnosis is displayed in 2 ways via screen display and LED flashes. Failure detection is based on input state of I

C bus and

the various control lines connected to the main microcomputer.

5.1.2 HOW TO ENTER THE SELF CHECK MODE

Before entering the Self check Display mode, confirm that the setting of TV / CATV SW of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR / DVD SW is at the "VCR" side. If the switches have not been properly set, you cannot enter the Self check Display mode.

(1) Set to 0 minutes using the [SLEEP TIMER] key. (2) Press the [VIDEO STATUS] key and [DISPLAY] key

simultaneously, then enter the service mode mode.

(3) Press the [2] key (SELF_CHK) before the service mode

screen disappears.

(4) Press the [SLEEP TIMER] key to enter Page 2 of the SELF

CHECK MODE.

• When the [RETURN +] key pressed, the first page change screen.

NOTE:

When a number key other than the [1] to [3] key is pressed in the SERVICE MODE screen, the other relevant screen may be displayed. This is not used in the adjustment procedure. Press the [MENU] key to return to the SERVICE MENU.

5.1.3 HOW TO EXIT THE SELF CHECK MODE To Save Failure History:

Turn off the power by unplugging the AC power cord plug when in the Self check display mode.

To Clear (Reset) Failure History:

Turn off the power by pressing the [POWER] key on the remote control unit when in the Self check display mode.

5.1.4 FAILURE HISTORY

Failure history can be counted up to 9 times for each item.When the number exceeds 9, display will remain as 9. Failure history will be stored in the memory unless it has been deleted.

NOTE:

Only SYNC (with/without sync signals) will be neither counted nor stored.

5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE

In addition to circuit failures (abnormal operation), the following cases may also be iagnosed as "Abnormal" and displayed and counted as "NG".

(1) Temporary defective transmissions across circuits due to

pulse interruptions

(2) Misalignment in the on/off timing of power for I

C bus

(VCC) when turning on/off the main power. Diagnosis may be impeded if a large number of items are displayed as "NG". As such, start Self check check only after 3 seconds in the case of receivers and 5 seconds in the case of panels upon turning on the power. If recurrences are expected, ensure to clear (reset) the failure history and record the new diagnosis reults.

MAIN MENU SCREEN

SERVICE MENU

1.ADJUST

2.SELF_CHK

3.I2C STOP

SELF CHECK MODE SCREEN (Page 1)

LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK

Item

CHECK Normality=OK Abnormality=NG

SELF CHECK MODE SCREEN (Page 2)

FAN OK ALM OK TMP OK ATP OK ASH OK

PNL OK MEM OK TMP OK AIO OK

Item

* As "SYNC" is not counted, the number of failures not displayed.

CHECK Normality=OK Abnormality=NG

Fig.1

(No.YA213)1-25

5.1.6 DETAILS

Self check is performed for the following items:

< Page 1 of screen >

Detection item Display Detection content

Low bias line short protection

LOB Confirm the operation of the low bais

(2.5V / 3.3V / 5V / 9V) protection circuit. Q9822 [REGULATOR PWB]

Diagnosis

signal (line)

Detection timing

LB_PRO Detection starts 3 seconds after the

power is turned on. If error continues between 400ms the power is turned off.

Fan lock FAN Not used. --- ---

Presence of sync signal SYNC Confirmation of presence of video

sync signal.

SDA Confirmation of presence of sync signal

in video signal. M : Main sync signal S : Sub sync signal HD : Component sync signal IC201 [ANALOG SIGNAL PWB]

AC power input TIM Not used. --- ---

Main CPU communication

MSM Confirmation of ACK (response)

signal which uses sync communications with Chassis CPU.

WAKE If it checks whenever sync communication

with SHM performed and no reply of ACK

signal an error will be counted. IC7601 [DIGITAL SIGNAL PWB]

Digital tuner DIGI Not used. --- ---

Main memory MEM Confirmation of reply of ACK signal

which uses I

C communication.

IC7602 [DIGITAL SIGNAL PWB]

AV select switch AVSW Same as above.

SDA If it checks whenever I2C communication

is performed and no reply of ACK signal

an error will be counted.

SDA Same as above.

IC301, IC501 [ANALOG SIGNAL PWB]

3 dimensions YC separator

Multi sound processor AIO Same as above.

YC Same as above.

IC1001 [DIGITAL SIGNAL PWB]

SDA Same as above.

IC3101 [RECEIVER PWB]

RF tuner TUN Same as above.

SDA Same as above.

TU3001 [RECEIVER PWB]

Ghost reduction GCR Not used. --- ---

DIST process IP Confirmation of reply of ACK signal

which uses I

C communication.

IC3001 [DIGITAL SIGNAL PWB]

RGB proccess RGB Same as above.

SDA If it checks whenever I

is performed and no reply of ACK signal

an error will be counted.

SDA Same as above.

IC3001 [DIGITAL SIGNAL PWB]

DVI (Digital communication)

Digital input HDMI Same as above.

DVI Not used. --- ---

SDA If it checks whenever I

IC8001 [DIGITAL SIGNAL PWB]

is performed and no reply of ACK signal

an error will be counted.

C communication

1-26 (No.YA213)

< Page 2 of screen >

Detection item Display Detection content

Fan lock FAN Not used. --- ---

Abnormal of operation of PANEL

Abnormal rise oftemperature in PANEL

Abnormal rise of temperature in AUDIO PWB

Short circuit detection of AUDIO PWB

Panel communication PNL Not used. --- ---

Sub memory MEM Not used. --- ---

Temp. sensor TMP Not used. --- ---

Audio control AIO Not used. --- ---

5.1.7 METHOD OF DISPLAY WHEN A RASTER IS NOT OUTPUT

In the state where a raster is not output by breakdown of the set, an error is displayed by blink of the POWER LED.

TYPE of error Display POWER LED flash cycle

Low bias line short protection LOB Low luminance blue turnig on and off at 1 second intervals.

< Explanation of operation >

If error is detected, the power is turned off. Shortly after a power is turned off, POWER LED will be blinked. Power cannot be turned on until the power cord takes out and inserts, after a power is turned off.

ALM Not used. --- ---

TMP Not used. --- ---

ATP Not used. --- ---

ASH Not used. --- ---

Diagnosis

signal (line)

Detection timing

(No.YA213)1-27

+ 60 hidden pages