JVC LT40FH76 Service Manual

SERVICE MANUAL

LCD FLAT TELEVISION

YA38020062

LT-40FH76/T

BASIC CHASSIS

FL3

TABLE OF CONTENTS

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

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

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

No.YA380

2006/2

SPECIFICATION

Items Contents

Dimensions ( W × H × D ) 100.0 cm × 73.4 cm × 32.9 cm [Included stand]

100.0 cm × 67.1 cm × 11.7 cm [TV only]

Mass 32.0 kg [Included stand]

25.0 kg [TV only]

Power Input AC110 V , 60 Hz

Power Consumption 255 W (Max)

TV RF System CCIR (M)

Color System NTSC

Stereo System BTSC (Multi Channel Sound)

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

TV Receiving Channels and Frequency

TV / CATV Total Channel 180 Channels

Intermediate Frequency

Color Sub Carrier Frequency 3.58 MHz

LCD panel 40V-inch wide aspect (16:9)

Screen Size Diagonal : 101.8 cm (H:88.5 cm × V : 49.8 cm) Display Pixels Horizontal : 1920 dots × Vertical : 1080 dots (FULL HD)

Audio Power Output 10 W + 10 W

Speaker 6.6 cm, round type × 4

Antenna Terminal (VHF/UHF/CABLE IN)

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

Monitor / Recording Output S-Video

Audio output 500 mV (rms), Low impedance, RCA pin jack × 2 Headphone 3.5 mm 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

Video IF

Sound IF

[INPUT-1]

1125i / 750p

525p / 525i

S-Video

[INPUT-1/2]

Video Audio

02 ch - 06 ch : 54 MHz - 88 MHz 07 ch - 13 ch : 174 MHz - 216 MHz 14 ch - 69 ch : 470 MHz - 806 MHz 54 MHz - 804 MHz Low Band : 02 - 06 High Band : 07 - 13 Mid Band : 14 - 22 Super Band : 23 - 36 Hyper Band : 37 - 64 Ultra Band : 65 - 94, 100 - 135 Sub Mid Band : 01, 96 - 99

45.75 MHz

41.25 MHz (4.5 MHz)

F-type connector, 75Ω unbalanced, coaxial × 1 RCA pin jack × 3

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

Mini-DIN 4pin × 1 Y: 1 V (p-p), 75 Ω C: 0.286 V(p-p) (burst signal), 75 Ω 1 V (p-p), 75 Ω, RCA pin jack × 1 250 mV(rms) (-10 dBs), Fs-18 dB low impedance, RCA pin jack × 2

1-2 (No.YA380)

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.YA380)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. Tie commercially available tough cord(s) to the hooks in the back of the TV, and fix the TV to solid walls or columns.

WALL

HOOK

Ventilation hole

*Diagram differs from actual appearance.

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.

䎕䎓䎓䏐䏐䎕䎓䎓䏐䏐

150mm150mm

䎘䎓䏐䏐

*Diagram differs from actual appearance.

䎘䎓䏐䏐

HOOK

It fixes in a band.

TV STAND

*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.YA380)

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.YA380)1-5

2.1 SYSTEM SETTEING

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

0000 0 0

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

Be sure to carry out the following operation at the end of the 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.

2.2 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.

DIGITAL INPUT

Digital-in will display when any picture signal in Digital-in is displayed.

SERVICE MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

SELF CHECK MODE SCREEN

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

0000 0 0

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.YA380)

2.3 TECHNICAL INFORMATION

2.3.1 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.

2.3.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications

Maximum dimensions ( W × H × D ) 952 mm × 551 mm × 51 mm

Weight 10.5 kg

Effective screen size Diagonal: 1018 mm (H: 885 mm × V : 498 mm) / 40 V

Aspect ratio 16 : 9

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

Resolution Horizontally 1920 × Vertically 1080 × RGB <W-XGA> / 6,220,800 dots in total

Pixel pitch (pixel size) H: 0.15375 mm, V: 0.46125 mm

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

Brightness 500 cd/m

Contrast ratio 1000 : 1

Response time less than 20 ms

View angle Horizontally: 178°, Vertically: 178°

Surface polarizer Anti-Glare type, Low reflective coat

Color filter Vertical stripe

Backlight Cold cathode fluorescent lamp × 22

Power supply voltage in LCD 5 V

Power supply voltage in inverter 24 V

Panel interface system LVDS (Low Voltage Differential Signaling)

2.3.1.2 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.YA380)1-7

2.3.2 MAIN CPU PIN FUNCTION [IC7601

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 Not used : AV COMPULINK control 69 NC O Not used

20 INT0 I

21 OUT1 O Ys (blanking) for OSD 71 P2.1 O Clock for Inter IC (serial) bus control

22 OUT2 O YM (transparence) for OSD 72 P2.0 I/O Data for Inter IC (serial) bus control

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 77 NC O Not used

28 CLK2 O Not used 78 NC O Not used

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

30 TxD2 O

31 SDA2 I/O Not used 81 P0.7 O Communication LED lighting

32 DIGR1 O R [1] for OSD 82 P0.6 O Test point

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

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

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

38 RTS0 O Busy for external programming [Operation = H] 88 SLC 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)

Not used : Digital tuner control

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

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

: DIGITAL PWB ASS'Y]

70 NC O Not used

80 P1.0 O Function LED lighting

POWER_SW

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

98 TVSETB I Test terminal [L Fixed]

I Power switch (mechanical) detection

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

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

1-8 (No.YA380)

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

CAUTION AT DISASSEMBLY:

• Be sure to perform the SYSTEM SETTEING, at the end of the procedure.

• 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.

3.1.1 REMOVING THE STAND (Fig.1)

(1) loosens the 2 screw [A]. (2) Remove the STAND COVER. (3) Remove the 2 screws [B] and 2 screw [C]. (4) Remove the STAND.

3.1.2 REMOVING THE REAR COVER (Fig.1)

• Remove the STAND. (1) Remove the JACK COVER (L/R). (2) Remove the 10 screws [D], the 6 screws [E], and the 2

screws [F].

(3) Remove the REAR COVER.

3.1.3 REMOVING THE POWER PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 1 screw [G]. (2) Remove the POWER CORD HOLDER. (3) Remove the POWER CORD. (4) Remove the 4 screws [H]. (5) Remove the POWER PWB.

3.1.4 REMOVING THE D-AMP PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 2 screw [J]. (2) Remove the D-AMP PWB.

3.1.7 REMOVING THE DC-DC PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 4 screws [Q]. (2) Remove the BACK BRACKET. (3) Remove the 4 screws [R]. (4) Remove the DC-DC PWB.

3.1.8 REMOVING THE DIGITAL SIGNAL PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER.

• Remove the BACK BRACKET.

• Remove the SHIELD COVER.

• Remove the DIGITAL TUNER UNIT.

• Remove the DIGITAL PWB BRACKET. (1) Remove the 2 screws [S] and 2 screws [T]. (2) Remove the SHIELD TERMINAL. (3) Remove the 9 screws [U]. (4) Remove the DIGITAL SIGNALPWB.

CAUTION :

Make sure to perform the "SYSTEM SETTEING", when DIGITAL SIGNAL PWB is replaced.

3.1.5 REMOVING THE ANALOG PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER.

• Remove the D-AMP PWB. (1) Remove the 5 screws [K]. (2) Remove the TERMINAL BASE. (3) Remove the 1 screw [L]. (4) Remove the TUNER BASE. (5) Remove the 2 screws [M]. (6) Remove the D-AMP BRACKET. (7) Remove the 2 screws [N]. (8) Remove the ANALOG PWB.

3.1.6 REMOVING THE SW PWB (Fig.1)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 3 screws [P]. (2) Remove the CONTROL ASSY with the SW PWB. (3) Remove the SW PWB.

(No.YA380)1-9

STAND COVER

STAND

BACK BRACKET

REAR COVER

D-AMP PWB

D-AMP PWB BRACKET

ANALOG PWB

DIGITAL PWB

TUNER BASE

DC-DC CON PWB

SHIELD TERMINAL

POWER CORD

POWER PWB

CONTROL ASSY

1-10 (No.YA380)

TERMINAL BASE

SW PWB

FRONT

Fig.1

3.1.9 REMOVING THE SPEAKER (Fig.2)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 6 screws [A]. (2) Remove the SPEAKER (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.

• When the speaker is decomposed, the performance cannot

be kept.

3.1.10 REMOVING THE LED PWB (Fig.2)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 2 screws [B]. (2) Remove the LED PWB.

3.1.11 REMOVING THE LED LENS (Fig.2)

• Remove the STAND.

• Remove the REAR COVER.

• Remove the LED PWB. (1) Remove the 2 screws [C]. (2) Remove the LED LENS.

3.1.12 REMOVING THE CARD PWB (Fig.2)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 3 screws [D]. (2) Remove the CARD BASE ASS’Y. (3) Remove the CARD SHIELD. (4) Remove the 4 screws [E]. (5) Remove the CARD PWB.

3.1.14 REMOVING THE LCD PANEL UNIT (Fig.2)

• Remove the STAND.

• Remove the REAR COVER.

• Remove the BACK BRACKET. (1) Remove the 2 screws [G], 2 screws [H], 3 screws [J] and

1 screw [K]. (2) Remove the MAIN BASE. (3) Remove the 3 screws [L] and 2 screw [M]. (4) Remove the TOP FARAME. (5) Remove the 2 screws [N] and 2 screw [P]. (6) Remove the BOTTOM FARAME. (7) Remove the LCD PANEL UNIT from the FRONT PANEL. (8) Remove the 2 screws [Q]. (9) Remove the CARD PWB BRACKET from the LCD PANEL

UNIT.

NOTE:

• Pay special attention not to break or damage on the FRONT

PANEL.

• The LCD PANEL UNIT is fixed to the FRONT PAMEL (at the

back side)by using double-side adhesive tapes. To remove the LCD PANEL UNIT, remove the adhesive tape on the FRONT PANEL slowly.

3.1.13 REMOVING THE SUB POWER PWB (Fig.2)

• Remove the STAND.

• Remove the REAR COVER. (1) Remove the 4 screws [F]. (2) Remove the SUB POWER PWB.

(No.YA380)1-11

CARD BASE ASSY

MAIN BASE

CARD PWB SHIELD

SUB POWER PWB

TOP FRAME

BOTTOM FRAME

CARD PWB

CARD PWB BRACKET

SPEAKER

LED PWB

LED LENS

FRONT PANEL

FRONT

1-12 (No.YA380)

Fig.2

3.2 MEMORY IC REPLACEMENT

S001 R DRIVE137 NTSC3 FULL STD LOW

SERVICE MENU

1. ADJUST

2. SELF CHECK

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.

3.2.1 MEMORY IC TABLE

Simbol Number of pins Mounting PWB Main content of data

IC7201

IC7602

48-pin DIGITAL PWB Progaram(Video process) of IC6001(System CPU) is memorized.

8-pin DIGITAL PWB Setting value of IC7601(MAIN CPU) is memorized.

3.2.2 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.

3.2.3 SERVICE MODE SETTING

SERVICE MODE SCREEN

MAIN MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

ADJUSTMENT MODE SCREEN

S001 R DRIVE137 NTSC3 FULL STD LOW

SETTING ITEM

Setting items Settings Item No.

Video system setting Adjust S001 - S009

Audio system setting Adjust T001 - T003

Main CPU system setting Fixed M001 - M224

Drive system setting Fixed F001 - F002

(NOT USED) Fixed D001

(NOT USED) Fixed Z001

Fig.1

(No.YA380)1-13

3.2.4 SETTINGS OF FACTORY SHIPMENT

3.2.4.1 BUTTON OPERATION 3.2.4.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

POWER Off

CHANNEL CABLE-02

VOLUME 10

3.2.4.3 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 +08 00 -10 00 BRIGHT 00 00 00 00 COLOR +03 00 00 00 TINT 00 00 00 00 DETAIL +06 00 00 00 ENERGY SAVER MODE COLOR TEMPERATURE COLOR MANAGEMENT DYNAMIC GAMMA ON ON ON ON SMART PICTURE OFF ON ON ON DIGITAL VNR AUTO AUTO AUTO AUTO MPEG NR ON ON ON ON

< HD MODE >

Setting item

PICTURE +11 00 00 00 BRIGHT 00 00 00 00 COLOR +07 00 -10 00 TINT 00 00 00 00 DETAIL +08 00 00 00 ENERGY SAVER MODE COLOR TEMPERATURE COLOR MANAGEMENT DYNAMIC GAMMA ON ON ON ON SMART PICTURE OFF ON ON ON DIGITAL VNR AUTO AUTO AUTO AUTO MPEG NR ON ON ON ON

DYNAMIC

+30 +20 00 -10

HIGH LOW HIGH HIGH

DYNAMIC

+30 +15 00 -10

HIGH LOW HIGH LOW

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

NATURAL CINEMA AUTO

VIDEO STATUS DYNAMIC

MTS STEREO

SOUND EFFECT

2. SOUND ADJUST

BASS 00

TREBLE 00

BALANCE 00

3. CLOCK / TIMERS

ON / OFF TIMER OFF

4. INITIAL SETUP

VIDEO-1 MONITOR OUT

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 HIGH

ILLUMINATION LOW

LANGUAGE ENG.

CLOSED CAPTION OFF(CC1/T1)

AUTO SHUT OFF OFF

XDS ID ON

V-CHIP OFF

Setting item Setting position

HD / ATSC FULL

A.H.S.+ OFF

BBE ON

SMART SOUND OFF

HYPER BASS OFF

Setting item Setting position

OFF

AUTO

DIGITAL

1-14 (No.YA380)

3.3 REPLACEMENT OF CHIP COMPONENT

3.3.1 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.

3.3.2 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.

3.3.3 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.

(4) Then solder leads B and C.

(No.YA380)1-15

SECTION 4

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

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

SMART SOUND OFF

MTS STEREO

BBE OFF

A.H.S OFF

A.H.B OFF

ASPECT FULL

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator) [NTSC]

• TV audio multiplex signal generator

• Remote control unit

4.4 ADJUSTMENT ITEMS

 VIDEO CIRCUIT

• WHITE BALANCE (HIGHLIGHT) adjustment

 MTS CIRCUIT

• MTS INPUT LEVEL adjustment

• MTS SEPARATION adjustment

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 (Fig.1)

SERVICE MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

Fig.1

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] keys is pressed in the SERVICE 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 SERVICE MENU SCREEN.

4.5.2 HOW TO EXIT THE SERVICE MODE

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

4.5.3 SERVICE MODE SELECT KEY LOCATION

VCR/DVD switch

TV/CATV switch

DISPLAY

SLEEP TIMER

VIDEO STATUS

MUTING

VOLUME -

POWER

NUMBER

CHANNEL +

VOLUME +

BACK

CHANNEL -

1-16 (No.YA380)

RM-C1257G

4.5.4 ADJUSTMENT MODE

S001 R DRIVE137 NTSC3 FULL STD LOW

This mode is used to adjust the VIDEO CIRCUIT and the MTS CIRCUIT.

4.5.4.1 HOW TO ENTER THE ADJUSTMENT MODE When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE (Fig.2).

4.5.4.2

DESCRIPTION OF STATUS DISPLAY OF ADJUSTMENT MODE

ADJUSTMENT MODE

SETTING ITEM No.

S001 R DRIVE137 NTSC3 FULL STD LOW

SIGNAL SYSTEM

SCREEN MODE

SETTING ITEM

Fig.2

(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

FULL : FULL 1609 : CINEMA, CINEMA ZOOM PANO : PANORAMA, HD PANORAMA REGU : REGULAR, SLIM JUST : FULL NATIVE

MULTI SCREEN

M2 : TWIN, FREEZE screen M12 : INDEX screen

SETTING VALUE (DATA)

VIDEO STATUS

WHITE BALANCE

(3) VIDEO STATUS

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

(4) WHITE BALANCE

HIGH : HIGH LOW : 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 - S009 Video system setting

T001 - T003 Audio system setting

M001 - M224 Main CPU system setting

F001 - F002 Drive system setting

D001 (NOT USED)

Z001 (NOT USED)

(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.

4.5.4.3 CHANGE AND MEMORY OF SETTING VALUE

SELECTION OF SETTING ITEM

• [CH+] / [CH-] key. Change the setting items up/ down.

S001... ↔ T001... ↔ M001... ↔ F001... ↔ D001... ↔ Z001...

• [SLEEP TIMER] key. Switches to the next items.

S001 → T001 → M001... → F001... → D001 → Z001

CHANGE OF SETTING VALUE (DATA)

• [VOL+] / [VOL-] key. Change the setting values up/down.

MEMORY OF SETTING VALUE (DATA)

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

(No.YA380)1-17

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

Item No. Item Variable range Setting value

S001 R DRIVE 000 - 255 119

S002 G DRIVE 000 - 255 138

S003 B DRIVE 000 - 255 140

S004 RESREV 000 - 255 000

S005 RESREV 000 - 255 002

S006 RESREV 000 - 255 002

S007 RESREV 000 - 255 002

S008 RESREV 000 - 255 002

S009 RESREV 000 - 255 002

4.6.2 AUDIO SYSTEM SETTING

Item No. Item Variable range Setting value

T001 INPLEVEL 000 - 015 008

T002 LOWSEPA 000 - 063 031

T003 HIGHSEPA 000 - 063 031

4.6.3 MAIN CPU SYSTEM SETTING (Fixed values)

Item No. Item Variable range Setting value

M001 1E00 00 - FF 00

M002 1E01 00 - FF 00

M003 1E02 00 - FF 05

M004 1E03 00 - FF 38

M005 1E04 00 - FF 10

M006 1E05 00 - FF 00

M007 1E06 00 - FF 00

M008 1E07 00 - FF 00

M009 1E08 00 - FF 11

M010 1E09 00 - FF 00

M011 1E0A 00 - FF 01

M012 1E0B 00 - FF 00

M013 1E0C 00 - FF 01

M014 1E0D 00 - FF 00

M015 1E0E 00 - FF 00

M016 1E0F 00 - FF 00

M017 1E10 00 - FF 00

M018 1E11 00 - FF 00

M019 1E12 00 - FF 00

M020 1E13 00 - FF 01

M021 1E14 00 - FF 01

M022 1E15 00 - FF 00

M023 1E16 00 - FF 00

M024 1E17 00 - FF 00

M025 1E18 00 - FF 00

M026 1E19 00 - FF 00

M027 1E1A 00 - FF 00

Item No. Item Variable range Setting value

M028 1E1B 00 - FF 00

M029 1E1C 00 - FF 00

M030 1E1D 00 - FF 00

M031 1E1E 00 - FF 00

M032 1E1F 00 - FF 00

M033 1E20 00 - FF 00

M034 1E21 00 - FF 00

M035 1E22 00 - FF 00

M036 1E23 00 - FF 00

M037 1E24 00 - FF 00

M038 1E25 00 - FF 00

M039 1E26 00 - FF 00

M040 1E27 00 - FF 00

M041 1E28 00 - FF 00

M042 1E29 00 - FF 00

M043 1E2A 00 - FF 00

M044 1E2B 00 - FF 00

M045 1E2C 00 - FF 00

M046 1E2D 00 - FF 00

M047 1E2E 00 - FF 00

M048 1E2F 00 - FF 00

M049 1E30 00 - FF 00

M050 1E31 00 - FF 00

M051 1E32 00 - FF 00

M052 1E33 00 - FF 00

M053 1E34 00 - FF 00

M054 1E35 00 - FF 00

M055 1E36 00 - FF 02

M056 1E37 00 - FF 00

M057 1E38 00 - FF 01

M058 1E39 00 - FF 0A

M059 1E3A 00 - FF 10

M060 1E3B 00 - FF 83

M061 1E3C 00 - FF 00

M062 1E3D 00 - FF 00

M063 1E3E 00 - FF 00

M064 1E3F 00 - FF 00

M065 1E40 00 - FF 00

M066 1E41 00 - FF 00

M067 1E42 00 - FF 03

M068 1E43 00 - FF 03

M069 1E44 00 - FF 02

M070 1E45 00 - FF 03

M071 1E46 00 - FF 3F

M072 1E47 00 - FF 00

1-18 (No.YA380)

Item No. Item Variable range Setting value

M073 1E48 00 - FF 00

M074 1E49 00 - FF 00

M075 1E4A 00 - FF 00

M076 1E4B 00 - FF 00

M077 1E4C 00 - FF 00

M078 1E4D 00 - FF 00

M079 1E4E 00 - FF 00

M080 1E4F 00 - FF 00

M081 1E50 00 - FF 00

M082 1E51 00 - FF 00

M083 1E52 00 - FF 00

M084 1E53 00 - FF 00

M085 1E54 00 - FF 00

M086 1E55 00 - FF 00

M087 1E56 00 - FF 00

M088 1E57 00 - FF 00

M089 1E58 00 - FF 00

M090 1E59 00 - FF 00

M091 1E5A 00 - FF 00

M092 1E5B 00 - FF 00

M093 1E5C 00 - FF 00

M094 1E5D 00 - FF 00

M095 1E5E 00 - FF 00

M096 1E5F 00 - FF 00

M097 1E60 00 - FF 00

M098 1E61 00 - FF 00

M099 1E62 00 - FF 00

M100 1E63 00 - FF 00

M101 1E64 00 - FF 00

M102 1E65 00 - FF 00

M103 1E66 00 - FF 00

M104 1E67 00 - FF 00

M105 1E68 00 - FF 00

M106 1E69 00 - FF 00

M107 1E6A 00 - FF 02

M108 1E6B 00 - FF 00

M109 1E6C 00 - FF 00

M110 1E6D 00 - FF 00

M111 1E6E 00 - FF 00

M112 1E6F 00 - FF 00

M113 1E70 00 - FF 00

M114 1E71 00 - FF 00

M115 1E72 00 - FF 00

M116 1E73 00 - FF 00

M117 1E74 00 - FF 00

M118 1E75 00 - FF 00

M119 1E76 00 - FF 00

M120 1E77 00 - FF 14

M121 1E78 00 - FF 03

M122 1E79 00 - FF 00

Item No. Item Variable range Setting value

M123 1E7A 00 - FF 00

M124 1E7B 00 - FF 00

M125 1E7C 00 - FF 00

M126 1E7D 00 - FF 00

M127 1E7E 00 - FF 01

M128 1E7F 00 - FF 00

M129 1E80 00 - FF 01

M130 1E81 00 - FF 00

M131 1E82 00 - FF 01

M132 1E83 00 - FF 00

M133 1E84 00 - FF 00

M134 1E85 00 - FF 00

M135 1E86 00 - FF 00

M136 1E87 00 - FF 00

M137 1E88 00 - FF 00

M138 1E89 00 - FF 00

M139 1E8A 00 - FF 00

M140 1E8B 00 - FF 00

M141 1E8C 00 - FF 00

M142 1E8D 00 - FF 00

M143 1E8E 00 - FF 00

M144 1E8F 00 - FF 00

M145 1E90 00 - FF 00

M146 1E91 00 - FF 00

M147 1E92 00 - FF 00

M148 1E93 00 - FF 00

M149 1E94 00 - FF 00

M150 1E95 00 - FF 00

M151 1E96 00 - FF 00

M152 1E97 00 - FF 00

M153 1E98 00 - FF 00

M154 1E99 00 - FF 00

M155 1E9A 00 - FF 01

M156 1E9B 00 - FF 00

M157 1E9C 00 - FF 03

M158 1E9D 00 - FF 00

M159 1E9E 00 - FF 00

M160 1E9F 00 - FF 00

M161 1EA0 00 - FF 00

M162 1EA1 00 - FF 00

M163 1EA2 00 - FF 01

M164 1EA3 00 - FF 00

M165 1EA4 00 - FF 00

M166 1EA5 00 - FF 00

M167 1EA6 00 - FF 00

M168 1EA7 00 - FF 00

M169 1EA8 00 - FF 00

M170 1EA9 00 - FF 00

M171 1EAA 00 - FF 00

M172 1EAB 00 - FF 00

(No.YA380)1-19

Item No. Item Variable range Setting value

M173 1EAC 00 - FF 09

M174 1EAD 00 - FF 00

M175 1EAE 00 - FF 00

M176 1EAF 00 - FF 00

M177 1EB0 00 - FF 0A

M178 1EB1 00 - FF 00

M179 1EB2 00 - FF 01

M180 1EB3 00 - FF 00

M181 1EB4 00 - FF 00

M182 1EB5 00 - FF 00

M183 1EB6 00 - FF 00

M184 1EB7 00 - FF 00

M185 1EB8 00 - FF 00

M186 1EB9 00 - FF 00

M187 1EBA 00 - FF 00

M188 1EBB 00 - FF 00

M189 1EBC 00 - FF 00

M190 1EBD 00 - FF 00

M191 1EBE 00 - FF 00

M192 1EBF 00 - FF 00

M193 1EC0 00 - FF 00

M194 1EC1 00 - FF 00

M195 1EC2 00 - FF 01

M196 1EC3 00 - FF 00

M197 1EC4 00 - FF 00

M198 1EC5 00 - FF 00

M199 1EC6 00 - FF 00

M200 1EC7 00 - FF 00

M201 1EC8 00 - FF 01

M202 1EC9 00 - FF 00

M203 1ECA 00 - FF 00

M204 1ECB 00 - FF 00

M205 1ECC 00 - FF 02

M206 1ECD 00 - FF 00

M207 1ECE 00 - FF 00

M208 1ECF 00 - FF 00

M209 1ED0 00 - FF 00

M210 1ED1 00 - FF 00

M211 1ED2 00 - FF 00

M212 1ED3 00 - FF 00

M213 1ED4 00 - FF 00

M214 1ED5 00 - FF FF

M215 1ED6 00 - FF 00

M216 1ED7 00 - FF 00

M217 1ED8 00 - FF 00

M218 1ED9 00 - FF 00

M219 1EDA 00 - FF 00

M220 1EDB 00 - FF 00

M221 1EDC 00 - FF 00

M222 1EDD 00 - FF 00

Item No. Item Variable range Setting value

M223 1EDE 00 - FF 00

M224 1EDF 00 - FF 00

4.6.4 DRIVE SYSTEM SETTING (Fixed values)

Item No. Item Variable range Setting value

F001 DD 000 - 001 000

F002 RAM REF 000 - 001 000

4.6.5 NOT USED (Fixed values)

Item No. Item Variable range Setting value

D001 RESREV 000 - 255 002

4.6.6 NOT USED (Fixed values)

Item No. Item Variable range Setting value

Z001 RESREV 000 - 255 002

1-20 (No.YA380)

4.7 ADJUSTMENT PROCEDURE

4.7.1 VIDEO CIRCUIT

Item

WHITE BALANCE

Measuring

instrument

Remote control unit

(HIGHLIGHT)

Signal generator

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) Adjust to 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 "137".

(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.

4.7.2 MTS CIRCUIT

Item

MTS INPUT LEVEL

MTS SEPARATION

L-Channel signal waveform

1 cycle

Measuring

instrument

Remote control unit

TV audio multiplex signal generator

Oscilloscope

Remote control unit

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

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

(3) Change the connection of the oscilloscope to

R OUT pin of the AUDIO OUT, and enlarge the voltage axis.

(4) Select "1.ADJUST" from the SERVICE

MODE.

R-Channel crosstalk portion

Minimum

(5) Set the initial setting value of the < T002 >

(LOW 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 ad-

just the < T003> (HI SEP).

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

value.

(No.YA380)1-21

SECTION 5

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

TMP 0 L 1 0 L 2 0 DDT 0 FAN 0 L C 0

IRS 0

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

0000 0 0

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.

(3) Press the [2] key (SELF CHECK) 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 [2] key is pressed in the SERVICE MENU SCREEN, the other relevant screen may be displayed. This is not used in the SELF CHECK. Press the [MENU] key to return to the SERVICE MENU SCREEN.

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.

5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE

In addition to circuit failures (abnormal operation), the following cases may also be diagnosed 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.

SERVICE MENU SCREEN

SERVICE MENU

1. ADJUST

2. SELF CHECK

3. I2C STOP

SELF CHECK MODE SCREEN (Page 1)

LOB 0 FAN 0 AUD 0

ANA 9 DIG 9

0000 0 0

Item Failure history

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.

1-22 (No.YA380)

SELF CHECK MODE SCREEN (Page 2)

TMP 0 L 1 0 L 2 0 DDT 0 FAN 0 L C 0

IRS 0

Item

Fig.1

Failure history

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

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

Audio AUD Not used ---- ----

Devices on the ANALOG PWB

Devices on the DIGITAL PWB

< Page 2 of screen >

Detection item Display Detection content

Temp. sensor TEM Not used ---- ----

Lamp does not light up L1 Not used ---- ----

Lamp goes out L2 Not used ---- ----

Abnormal DD CPU circuit

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

Lamp cover open LC Not used ---- ----

Abnormal of optical iris IRS Not used ---- ----

LOB Confirm the operation of the low bais (16V / 5V /

LCD5V / 3.3V / 1.2V) protection circuit.

, Q9651[POWER PWB]

Q9601

ANA Confirmation of reply of ACK signal which uses

I2C communication.

, IC102, IC281, IC381, IC601, IC606,

IC101 IC061, TU001 [ANALOG PWB]

DIG Confirmation of reply of ACK signal which uses

I2C communication.

, IC8831 [DIGITAL PWB]

IC6401

DDT Not used ---- ----

Diagnosis

signal (line)

LB_PRO Detection starts 3 seconds after

the power is turned on. If error continues between 200 ms the power is turned off.

SDA If it checks whenever I2C

communication is performed and no reply of ACK signal an error will be counted.

SDA If it checks whenever I2C

communication is performed and no reply of ACK signal an error will be counted.

Diagnosis

signal (line)

Detection timing

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 POWER LED flash cycle

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

CableCard error detection Low luminance blue turnig on and off at 2 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.

(No.YA380)1-23

1-24 (No.YA380)

Victor Company of Japan, Limited Flat Panel Display Category 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

(No.YA380)

Printed in Japan

VPT

SCHEMATIC DIAGRAMS

LCD FLAT TELEVISION

YA38020062

LT-40FH76/T

BASIC CHASSIS

CD-ROM No.SML200602

FL3

No.YA380

2006/2

LT-40FH76

STANDARD CIRCUIT DIAGRAM

NOTE ON USING CIRCUIT DIAGRAMS

1.SAFETY

The components identified by the symbol and shading are critical for safety. For continued safety replace safety ciritical components only with manufactures recommended parts.

2.SPECIFIED VOLTAGE AND WAVEFORM VALUES

The voltage and waveform values have been measured under the following conditions.

(1)Input signal : Colour bar signal

(2)Setting positions of each knob/button and variable resistor

(3)Internal resistance of tester

(4)Oscilloscope sweeping time

(5)Voltage values

Since the voltage values of signal circuit vary to some extent according to adjustments, use them as reference values.

: Original setting position when shipped

: DC 20kΩ/V

: H

: V

: Othters

: All DC voltage values

20µs / div

5ms / div

Sweeping time is specified

3.INDICATION OF PARTS SYMBOL [EXAMPLE]

In the PW board

: R209

R209

Type

No indication

MM PP

MPP

MF TF BP

TAN

(3)Coils

No unit

Others

(4)Power Supply

Respective voltage values are indicated

(5)Test point

: Test point

(6)Connecting method

: Ceramic capacitor : Metalized mylar capacitor

: Polypropylene capacitor : Metalized polypropylene capacitor : Metalized film capacitor : Thin film capacitor : Bipolar electrolytic capacitor : Tantalum capacitor

: [µH]

: As specified

: B1

: 9V

: Connector

: Receptacle

: Only test point display

: Wrapping or soldering

: B2 (12V

: 5V

)

4.INDICATIONS ON THE CIRCUIT DIAGRAM

(1)Resistors

Resistance value

No unit : [Ω]

K M

Rated allowable power No indication : 1/16 [W]

Others : As specified

Type

No indication

OMR

MFR

MPR

UNFR

Composition resistor 1/2 [W] is specified as 1/2S or Comp.

(2)Capacitors

Capacitance value

1 or higher : [pF]

less than 1

Withstand voltage

No indication : DC50[V]

Others : DC withstand voltage [V]

AC indicated

Electrolytic Capacitors

47/50[Example]: Capacitance value [µF]/withstand voltage[V]

: [kΩ]

: [MΩ]

: Carbon resistor

: Oxide metal film resistor

: Metal film resistor

: Metal plate resistor

: Uninflammable resistor

: Fusible resistor

: [µF]

: AC withstand voltage [V]

(7)Ground symbol

: LIVE side ground

: ISOLATED(NEUTRAL) side ground

: EARTH ground

: DIGITAL ground

5.NOTE FOR REPAIRING SERVICE

This model's power circuit is partly different in the GND. The difference of the GND is shown by the LIVE : ( ) side GND and the ISOLATED(NEUTRAL) : ( ) side GND. Therefore, care must be taken for the following points.

(1)Do not touch the LIVE side GND or the LIVE side GND and the ISOLATED(NEUTRAL) side GND simultaneously. if the above caution is not respected, an electric shock may be caused. Therefore, make sure that the power cord is surely removed from the receptacle when, for example, the chassis is pulled out.

(2)Do not short between the LIVE side GND and ISOLATED(NEUTRAL side GND or never measure with a measuring apparatus measure with a measuring apparatus ( oscilloscope, etc.) the LIVE side GND and ISOLATED(NEUTRAL) side GND at the same time. If the above precaution is not respected, a fuse or any parts will be broken.

Since the circuit diagram is a standard one, the circuit and circuit constants may be subject to change for improvement without any notice.

NOTE Due improvement in performance, some part numbers show in the circuit diagram may not agree with those indicated in the part list. When ordering parts, please use the numbers that appear in the Parts List.

)

(No.YA380)2-1

CONTENTS

SEMICONDUCTOR SHAPES ......................................................................2-2

WIRING DIAGRAM ........................................................................................2-3

BLOCK DIAGRAM ........................................................................................2-5

CIRCUIT DIAGRAMS

ANALOG PWB CIRCUIT DIAGRAM ........................................................................................................... 2-7

DIGITAL PWB CIRCUIT DIAGRAM .......................................................................................................... 2-19

MAIN POWER PWB CIRCUIT DIAGRAM ................................................................................................ 2-51

LED PWB CIRCUIT DIAGRAM ................................................................................................................. 2-55

SW PWB CIRCUIT DIAGRAM ................................................................................................................. 2-56

D-AMP PWB CIRCUIT DIAGRAM ............................................................................................................ 2-57

CARD PWB CIRCUIT DIAGRAM .............................................................................................................. 2-59

DC-DC PWB CIRCUIT DIAGRAM ............................................................................................................. 2-63

SUB POWER PWB CIRCUIT DIAGRAM .................................................................................................. 2-65

PATTERN DIAGRAMS

ANALOG PWB PATTERN ........................................................................................................................ 2-67

DIGITAL PWB PATTERN ......................................................................................................................... 2-69

MAIN POWER PWB PATTERN ................................................................................................................ 2-73

CARD PWB PATTERN ............................................................................................................................. 2-75

DC-DC PWB PATTERN ............................................................................................................................ 2-76

SUB POWER PWB PATTERN .................................................................................................................. 2-77

LED PWB PATTERN ................................................................................................................................ 2-78

SW PWB PATTERN ................................................................................................................................. 2-78

D-AMP PWB PATTERN ............................................................................................................................ 2-78

VOLTAGE CHATRS ................................................................................... 2-79

WAVEFORMS ............................................................................................ 2-81

USING P.W. BOARD

P.W.B ASS’Y name

ANALOG P.W. BOARD

D-AMP P.W. BOARD

SW P.W. BOARD

CARD P.W. BOARD

LED P.W. BOARD

MAIN POWER P.W. BOARD

DC-DC P.W. BOARD

SUB POWER P.W. BOARD

DIGITAL P.W. BOARD

P.W.B ASS’Y number

LCA10637-02A (SFL-1212A)

LCA90550-01B (SFL-6201A)

LCA90551-02A (SFL-7203A)

LCA10556-01C (SRP-8511A)

LCA90552-06A (SFL-8707A)

LCA90575-02C (SFL-9041A)

LCA90606-04A (SFL-9146A)

LCA10639-03B (SFL-9706A)

LCA10599-72A (SFL-0D152A)

SEMICONDUCTOR SHAPES

TRANSISTOR

BOTTOM VIEW FRONT VIEW TOP VIEW

E C B

BOTTOM VIEW FRONT VIEW TOP VIEW

CHIP IC

OUT

ECB

IN OUTE

(G)E(S)C(D)

TOP VIEW

1 N

ECB

1 N

CHIP TR

ECB

2-2(No.YA380)

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