JVC LT-37DR1BJ, LT-37DR1BU Schematic

SERVICE MANUAL

INTEGRATED DIGITAL TERRESTRIAL LCD TELEVISION

YA688<Rev.001>20094SERVICE MANUAL

LT-37DR1BJ/PP, LT-37DR1BU/PP

BASIC CHASSIS

FY2

COPYRIGHT © 2009 Victor Company of Japan, Limited

<FY2 CHASSIS LINEUP>

No.YA687: LT-32DR1BJ, LT-32DR1BU No.YA688: LT-37DR1BJ, LT-37DR1BU No.YA689: LT-42DR1BJ, LT-42DR1BU

TABLE OF CONTENTS

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

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

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

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-19

COPYRIGHT © 2009 Victor Company of Japan, Limited

No.YA688<Rev.001>

2009/4

SPECIFICATION

Items

Dimensions ( W × H × D ) 90.8 cm × 63.6 cm × 27.9 cm [Included stand]

90.8 cm × 58.7 cm × 10.9 cm [TV only]

Mass 17.8 kg [Included stand]

16.5 kg [TV only]

Power Input AC220V - AC240 V, 50 Hz

Power Consumption 129 W (Standby: 0.5 W)

TV RF System Analog CCIR (B/G, I, D/K, L)

Digital DVB-T 7 MHz / 8 MHz

Colour System PAL

SECAM
NTSC 3.58/4.43 [EXT only]

Stereo System NICAM (B/G, I, D/K, L), A2 (B/G, D/K)

Receiving Frequency Analog VHF: 47MHz - 470MHz

UHF: 470 MHz - 862 MHz
CATV: 116MHz - 172MHz / 220MHz - 469MHz

174-230 MHz / 470-862 MHz

Digital

Intermediate
Frequency

Colour Sub
Carrier Frequency

Teletext System Analog FLOF (Fastext level 2.5)

LCD panel 37V-inch wide aspect (16 : 9)

Screen Size Diagonal: 94 cm (H: 81.9 cm × V: 46.0 cm)
Display Pixels Horizontally 1920 × Vertically 1080 × RGB <W-UXGA> 6220800 dots in total

Audio Power Output 10 W + 10 W

Speaker 4.0 cm × 16.0 cm, oval type × 2 (Oblique Cone)
Aerial terminal (VHF/UHF) 75 Ω unbalanced, coaxial
EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) × 2

EXT-3 (Input) Component Video

750p / 1125i

525i / 525p / 625i / 625p

EXT-4 / EXT-5 / EXT-6
(HDMI Input)

Supported format (Video) 525i/525p/625i/625p/750p(50/60)/1125i(50/60)/1125p(24/50/60)

Supported format (Audio) PCM 2ch

Digital Audio Optical Output Digital SPDIF × 1
USB Input (Photo Viewer ) USB connector (Series A) × 1
Headphone 3.5 mm stereo mini jack × 1
Remote Control Unit RM-C2501 (AAA/R03 dry cell battery × 2)

Design & specifications are subject to change without notice.

VIF 38.9MHz (B/G, I, D/K, L)

SIF 33.4MHz (5.5MHz :B/G)

32.9MHz (6.0MHz :I)

32.4MHz (6.5MHz :D/K)

PAL 4.43MHz

SECAM 4.40625MHz / 4.25MHz

NTSC 3.58MHz / 4.43MHz

TOP
WST(World Standard system)

Digital EBU TEXT MHEG 5 UK profile

RCA pin jack × 3
Y : 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75Ω
Pb/Pr : ±0.35V(p-p), 75 Ω
Y : 1 V (p-p), Positive (Negative sync.), 75 Ω
Cb/Cr : 0.7V(p-p), 75 Ω

Audio 500 mV (rms), High impedance, RCA pin jack × 2

HDMI 2-row 19pin connector × 3

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

LT-37DR1BU LT-37DR1BJ

Contents

1-2 (No.YA688<Rev.001>)

SECTION 1

PRECAUTION

1.1 SAFETY PRECAUTIONS [EXCEPT FOR UK]

(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

0.7mA AC (r.m.s.).
However, in tropical area, this must not exceed 0.35V
AC (r.m.s.). This corresponds to 0.3mA 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.YA688<Rev.001>)1-3

1.2 SAFETY PRECAUTIONS [FOR UK]

(1) The design of this product contains special hardware and 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 product 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 product have special safety-related characteristics. These characteristics are often

not evident from visual inspection nor can the protection afforded by them necessary 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 the 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) The leads in the products are routed and dressed with ties, clamps, tubing’s, barriers and the like to be separated from live parts,

high temperature parts, moving parts and / or sharp edges for the prevention of electric shock and fire hazard. When service is
required, the original lead routing and dress should be observed, and it should be confirmed that they have been returned to
normal, after re-assembling.

WARNING

(1) The equipment has been designed and manufactured to meet international safety standards.
(2) It is the legal responsibility of the repairer to ensure that these safety standards are maintained.
(3) Repairs must be made in accordance with the relevant safety standards.
(4) It is essential that safety critical components are replaced by approved parts.
(5) If mains voltage selector is provided, check setting for local voltage.

1.3 INSTALLATION

1.3.1 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

*Diagram differs from actual appearance.

1.3.2 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.

200 mm

50 mm150 mm 150 mm 50 mm

*Diagram differs from actual appearance.

1-4 (No.YA688<Rev.001>)

1.3.3 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.

Hole

Belt and screw (not provided)

*Diagram differs from actual appearance.

1.3.4 NOTES ON HANDLING

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.

1.4 HANDLING LCD PANEL

1.4.1 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) Avoid placing the unit under direct sunlight over a

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

(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.

1.4.3 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 COLOUR.

(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).

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

(No.YA688<Rev.001>)1-5

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 FEATURES

DIGITAL TUNER

This TV can receive both DVB-T (Digital terrestrial broadcasting)
and Analogue terrestrial broadcasting.

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.

Colour Management

This function ensures dull colours are compensated to
produce natural hues.

Picture Management

This function makes it easier to see the dark areas when a
picture has many dark areas, and makes it easier to see the
bright areas when a picture has many bright areas.

2.2 MAIN DIFFERENCE LIST

Item LT-37DR1BJ LT-37DR1BU

POWER CORD UK Type (3-Pins) EU Type (2-Pins)

Smart Picture

This function detects the APL (Average Picture Level) and
adjusts the contrast suitable for what you are watching.

DIGITAL VNR

This function cuts down the amount of noise in the original
picture.

MPEG Noise Reduction

This function effects the block noise removal and mosquito NR
simultaneously.

1-6 (No.YA688<Rev.001>)

2.3 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2

Pin No. Signal designation Matching value EXT-1 EXT-2

1 AUDIO R output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
2 AUDIO R input 500mV(rms) (Nominal), High impedance Used (R1) Used (R2)
3 AUDIO L output 500mV(rms) (Nominal), Low impedance Used (TV OUT) Used (LINE OUT)
4 AUDIO GND Used Used
5 GND (B) Used Used
6 AUDIO L input 500mV(rms) (Nominal), High impedance Used (L1) Used (L2)
7 B input 700mV
8 FUNCTION SW

(SLOW SW)

Low : 0V-3V
High : 8V-12V, High impedance

, 75Ω Used Not used

(B-W)

Used Used

9 GND (G) Used Used
10 SCL / T-V LINK Not used Not used
11 G input 700mV

, 75Ω Used Not used

(B-W)

12 SDA Not used Not used
13 GND (R) Used Used
14 GND (YS) Used Not used
15 R / C input R : 700mV

C : 300mV

(B-W)
(P-P)

, 75Ω

, 75Ω

Used (C1/R) Used (C2)

16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75Ω Used Not used

17 GND (VIDEO output) Used Used
18 GND (VIDEO input) Used Used
19 VIDEO output 1V
20 VIDEO / Y input 1V

(Negative sync), 75Ω Used (TV OUT) Used (LINE OUT)

(P-P)

(Negative sync), 75Ω Used (Y1/V) Used (Y2/V)

(P-P)

21 COMMON GND Used Used

(P-P= Peak to Peak, B-W= Blanking to white peak)

[Pin assignment]

20 18 16 14 12 10 8 6 4 2

21 19 17 15 13 11 9 7 5 3 1

(No.YA688<Rev.001>)1-7

2.4 TECHNICAL INFORMATION

2.4.1 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.

2.4.1.1 SPECIFICATIONS

The following table shows the specifications of this unit.

Item Specifications

Maximum dimensions ( W × H × D ) 87.7 cm × 51.68 cm × 5.53 cm

Weight 10.0 kg

Screen size Diagonal: 94 cm (H: 81.9 cm × V: 46.0 cm)

Aspect ratio 16 : 9

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

Resolution Horizontally 1920 × Vertically 1080 × RGB <W-UXGA> 6220800 dots in total

Pixel pitch (pixel size) Horizontally: 0.42675 mm, Vertically: 0.42675 mm

Displayed colour 16777216 colours 256 colours for R G and B

Brightness 500 cd/m

2

Contrast ratio 2500 : 1

Response time (Gray toGray) 6.5 ms

View angle (Horizontally) 178°
View angle (Vertically) 178°

Surface polarizer Anti-Glare type Low reflective coat

Colour filter Vertical stripe

Backlight Cold cathode fluorescent lamp

Power supply voltage in LCD 12 V

Power supply voltage in inverter 24 V

Panel interface system LVDS (Low Voltage Differential Signaling)

2.4.1.2 PIXEL FAULT

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

 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.

 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.

 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.

1-8 (No.YA688<Rev.001>)

2.4.2 VIDEO PROCESSING CPU PIN FUNCTION [IC4101 : MAIN PWB]

Pin Pin name I/O Function

1 REQUEST O Request for MIPS

2NC - Not used

3NC - Not used

4NC - Not used

5NC - Not used

6 BYTE I L fixed

7 CNVSS - GND

8NC - Not used

9NC - Not used

10 RESET I CPU reset [Reset = L]

11 XOUT O X'tal oscillation for CPU system clock (12.5MHz)

12 VSS - GND

13 XIN I X'tal oscillation for CPU system clock (12.5MHz)

14 VCC - 3.3V power supply

15 NC - Not used

16 BL_ON_IN I Detect power on/off control of back-light

17 MAIN_VD I RGB_Vsync input

18 VD I Vsync of LVDS drive

19 NC - Not used

20 SCL_EEPROM O Clock for I2C bus (for IC4102: MEMORY)

21 NC - Not used

22 SDA_EEPROM I/O Data for I2C bus (for IC4102: MEMORY)

23 VD I Vsync of LVDS drive

24 NC - Not used

25 NC - Not used

26 NC - Not used

27 SCL3 I Clock for I2C bus

28 SDA3 I/O Data for I2C bus

29 E8_DATAO O Data for Debugging Emulator

30 E8_DATAI I Data for Debugging Emulator

31 E8_CLK I Clock for Debugging Emulator

32 E8_BUSY O Busy for Debugging Emulator

33 T2R_TXD O Serial Interface for service

34 T2R_RXD I Serial Interface for service

35 NC - Not used

36 NC - Not used

37 MODE_SEL I H fixed

38 NC - Not used

39 E8_EPM I Setting for flash write mode

40 NC - Not used

41 NC - Not used

42 NC - Not used

43 FORZA_RST O Reset for IC5001

44 E8_CE I Setting for flash write mode

45 SDA_FORZA I/O Data for I2C bus (for IC5001)

46 SCL_FORZA O Clock for I2C bus (for ICIC5001)

47 NC - Not used

48 NC - Not used

49 CS O SPI chip select for LVDS drive

50 CARIB_RST O Reset for LVDS drive

51 BL_ON O Power on/off control for back-light [ON = H]

52 LCD_POW O Power on/off control for LCD drive [ON = H]

Pin Pin name I/O Function

53 LVDS_SEL - Not used

54 NC - Not used

55 NC - Not used

56 NC - Not used

57 MODE3 - Not used

58 MODE2 - Not used

59 MODE1 - Not used

60 VCC - 3.3V power supply

61 MODE0 - Not used

62 VSS - GND

63 NC - Not used

64 NC - Not used

65 NC - Not used

66 NC - Not used

67 NC - Not used

68 NC - Not used

69 NC - Not used

70 NC - Not used

71 STATUS - Not used

72 NC - Not used

73 LCD_POW_IN I Detect power on/off control of LCD drive

74 AUDIO_RST O Reset for IC4501

75 SDA_AUDIO O Data for I2C bus (for IC4501)

76 SCL_AUDIO O Clock for I2C bus (for IC4501)

77 NC - Not used

78 NC - Not used

79 NC - Not used

80 NC - Not used

81 NC - Not used

82 NC - Not used

83 NC - Not used

84 NC - Not used

85 NC - Not used

86 NC - Not used

87 NC - Not used

88 NC - Not used

89 NC - Not used

90 NC - Not used

91 NC - Not used

92 NC - Not used

93 RF_AGC - Not used

94 AVSS - GND

95 EE_SENS I Eco sensor detection

96 VREF - 3.3V power supply

97 AVCC - 3.3V power supply

98 MISO O SPI data for LVDS drive

99 MOSI I SPI data for LVDS drive

100 SCLK O SPI clock for LVDS drive

(No.YA688<Rev.001>)1-9

SECTION 3

DISASSEMBLY

3.1 DISASSEMBLY PROCEDURE

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

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

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

• Be sure to reattach the wire clamps removed during the procedure to the original positions. (Attaching the wire clamps in wrong
positions may affect the performance.)

REFERENCE:

When removing each board, remove the connector if necessary. The operation is easier if you write down the connection points
(connector numbers) of the connector. For connection of each board, refer to the "WIRING DIAGRAM" of the Standard Circuit
Diagram.

3.1.1 REMOVING THE REAR COVER (Fig.3-1)

(1) Remove the 1 screw [A].
(2) Remove the POWER CORD COVER.
(3) Remove the 8 screws [B] and 12 screws [C].
(4) Remove the REAR COVER.

3.1.2 REMOVING THE MAIN PWB (Fig.3-1)

• Remove the REAR COVER.
(1) Remove the 2 hooks [a].
(2) Remove the DIGITAL BASE.
(3) Remove the 1 screw [E].
(4) Remove the TERMINAL BASE.
(5) Remove the 5 screw [F].
(6) Remove the MAIN PWB.

3.1.3 REMOVING THE POWER PWB (Fig.3-1)

• Remove the REAR COVER.

• Remove the POWER CORD.
(1) Remove the 6 screws [G].
(2) Remove the POWER PWB.

3.1.4 REMOVING THE SW PWB (Fig.3-1)

• Remove the REAR COVER.
(1) Remove the 2 hooks [b].
(2) Remove the CONTROL KNOB with SW PWB.
(3) Remove the SW PWB from the CONTROL KNOB.

3.1.5 REMOVING THE REMOTE PWB (Fig.3-1)

• Remove the REAR COVER.
(1) Remove the 1 screw [H].
(2) Remove the REMOTE PWB.

3.1.6 REMOVING THE SPEAKER (Fig.3-1)

• Remove the REAR COVER.
(1) Remove the SPEKAER.

3.1.7 REMOVING THE STAND (Fig.3-1)

(1) Remove the 4 screws [J].
(2) Remove the STAND.

3.1.8 REMOVING THE LED PWB (Fig.3-1)

• Remove the REAR COVER.

• Remove the POWER PWB.

• Remove the SPEAKER.

• Remove the STAND.
(1) Remove the 3 screws [K], 4 screws [L] and 2 screws [M].
(2) Remove the MAIN BASE.
(3) Remove the 2 screws [N].
(4) Remove the LED PWB.

3.1.9 REMOVING THE LCD PANEL UNIT (Fig.3-1)

• Remove the REAR COVER.

• Remove the STAND.

• Remove the MAIN BASE.
(1) Remove the 1 screw [H].
(2) Remove the LCD SUPPORT BRACKET and REMOTE

PWB.
(3) Remove the 2 screws [P].
(4) Remove the LCD SUPPORT BRACKET (x2).
(5) Remove the LCD PANEL UNIT from the FRONT PANEL.

1-10 (No.YA688<Rev.001>)

POWER CORD COVER

POWER CORD

B

C

A

B

REAR COVER

F

MAIN PWB

INSULATOR

CONTROL ASSY

SW PWB

aa

LCD SUPPORT

P

BRACKET

D

POWER PWB

K

REMOTE PWB

H

L

MAIN BASE

LCD SUPPORT
BRACKET

E

DIGITAL BASE

K

L

K

aa

L

TERMINAL BASE

J

M

L

M

STAND

P

LCD PANEL UNIT

FRONT PANEL

LCD SUPPORT BRACKET

N

SPEAKER

LED PWB

SPEAKER

Fig.3-1

(No.YA688<Rev.001>)1-11

3.1.10 REMOVING THE CONTROL PWB (Fig.3-2)

• Remove the REAR COVER.

• Remove the MIAN BASE.
(1) Remove the 5 screws [A].
(2) Remove the LCD CONTROL PWB COVER.
(3) Remove the LCD CONTROL PWB.

LCD CONTROL PWB COVER

3.1.11 REMOVING THE INVERTER PWB (Fig.3-2)

• Remove the REAR COVER.
(1) Remove the 6 screws [B].
(2) Remove the INVERTER PWB COVER.
(3) Remove the INVERTER PWB.

INVERTER PWB COVER

B

A

LCD CONTROL PWB

LCD PANEL UNIT

INVERTER PWB

Fig.3-2

1-12 (No.YA688<Rev.001>)

3.2 MEMORY IC REPLACEMENT

S001 R DRIVE M 000

• 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

Symbol Number of pins Mounting PWB Main content of data

IC1003

IC3004

IC3005

IC3006

IC4102

8-pin MAIN PWB Setting data for IC1001(MAIN CPU) is memorized.

8-pin MAIN PWB E-DID DATA for HDMI is memorized.

8-pin MAIN PWB E-DID DATA for HDMI is memorized.

8-pin MAIN PWB E-DID DATA for HDMI is memorized.

8-pin MAIN PWB Setting value of IC4101(VIDEO PROCESS 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.3-2). Refer to the SERVICE ADJUSTMENT for setting.

3.2.3 SERVICE MODE SETTING

SERVICE MODE SCREEN

SERVICE MENU SCREEN

Service Menu

1

Adjust

2

Monitor Mode

3

System Configuration

4

Software Update

5

I2c Stop Mode

6

EDID Write Protect

7

HDMI_EQ Setting

8

Software Version Check

9

Calibration Setting

Navigate

Apply

Cancel

Press [1] key

ADJUSTMENT MODE SCREEN

S001 R DRIVE M 000

SETTING ITEM

Setting items Settings Item No.

Video system setting Adjust S001 - S003

3.2.4 SETTINGS OF FACTORY SHIPMENT

3.2.4.1 BUTTON OPERATION

Setting item Setting position

Power Off
Channel PR1
Volume 10
TV/AV TV

3.2.4.2 REMOTE CONTROL DIRECT OPERATION

Setting item Setting position

Channel PR01
Volume 10
Sub Power Off
Zoom Auto
Sleep Timer Off
Subtitle Selection On
Menu Language English
Country United Kingdom
System Language English
Place of Installation Home

Fig.3-2

(No.YA688<Rev.001>)1-13

3.2.4.3 REMOTE CONTROL MENU OPERATION

(1) PICTURE

(3) SYSTEM SETUP

Setting item Setting position

Picture Mode Bright (SHOP)

Standard (HOME)

Colour Temp. Cool(SHOP)

Normal(HOME)

Features

Super Digipure Mid

Colour Management On

Picture Management On

Smart Picture On

Dynamic Backlight On

MPEG Noise Reduction Off

Colour System Auto

4:3 Aspect Setting Panoramic

1080 Auto Setting Panoramic

(2) SOUND

Setting item Setting position

Stereo / I•II Stereo Sound

Bass Centre

Treble Centre

Balance Centre

Surround Off

Auto Volume Control Off

Digital Audio Output Full

Setting item Setting position

Time Zone Auto

System Language English

Assistive Services -

Enter PIN code 000

Maturity Rating None

Connection Setting EXT-3 Setting: Component

EXT ID Setting: ----

Blue Back On

Power Lamp On

Radio Mode Off

(4) PR INSTALLATION

Setting item Setting position

Menu Language English

Antenna Power Off

Favourite Setting Select None

PR Lock Lock None

Auto Demonstration Off

1-14 (No.YA688<Rev.001>)

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

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.

A

B

C

(4) Then solder leads B and C.

A

B

C

(No.YA688<Rev.001>)1-15

SECTION 4

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

warming 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 position

Picture Mode Standard

Picture Adjustments Centre

Colour Temp. Normal

Super Digipure Auto

Movie Theatre Auto

Colour Management On

Picture Management On

Zoom Full

4.4 BASIC OPERATION OF SERVICE MODE

4.4.1 HOW TO ENTER THE SERVICE MODE

(1) Press [INFORMATION] key and [MUTING] key on the

remote control unit simultaneously to enter the SERVICE
MODE SCREEN.

(2) In the SERVICE MENU, press the [1] key to display

ADJUSTMENT MODE SCREEN.

SERVICE MENU SCREEN

Service Menu

1

Adjust

2

Monitor Mode

3

System Configuration

4

Software Update

5

I2c Stop Mode

6

EDID Write Protect

7

HDMI_EQ Setting

8

Software Version Check

9

Calibration Setting

Navigate

4.4.2 HOW TO EXIT THE SERVICE MODE

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

4.4.3 SERVICE MODE SELECT KEY LOCATION

[Function/] key

[MENU] key

Apply

Cancel

[FUNCTION
/] key

[BACK] key

4.3 MEASURING INSTRUMENT AND FIXTURES

• Signal generator (Pattern generator) [PAL]

• Remote control unit

1-16 (No.YA688<Rev.001>)

[MUTING] key

[INFORMATION] key

4.4.4 SERVICE MODE FLOW CHART

S001 R DRIVE M 000

ADJUSTMENT MODE MONITOR MODE

SERVICE MENU SCREEN

Service Menu

1

Adjust

2

Monitor Mode

3

System Configuration

4

Software Update

5

I2c Stop Mode

6

EDID Write Protect

7

HDMI_EQ Setting

8

Software Version Check

9

Calibration Setting

Apply

Navigate

Cancel

AUS GRC TWN

AUT HUN UND

BEL IRL

BGR ITA

CHE LUX

CZE NLD

DEU NOR

DNK POL

ESP PRT

FIN SGP

FRA SWE

GBR

01:Australia

Monitor Mode

S001 R DRIVE M 000

[1] key [2] key

Selected source RF Frecuency 045.25

Signal format ----- Signal Strength 0

UTC Signal Quality 0

Service Name ----- ONID 0

Video No Signal LCN Scart1

Audio BG NoSound Language English

Network Name CA No Information

Service Type

SYSTEM CONFIGRATION SOFTWARE UPDATE

System Configuration

Country

TUR

English Hungarian Serbian

German Russian Slovak

French

Italian

Spanish Czech

Catalan Bulgarian

Dutch Ukrainian

Danish Turkish

Swedish Romanian

Norwegian Arabic

Finnish Chinese

Polish

13

Navigate

Language

Greek

Portuguese

Croatian

Install

Store

Cancel

Slovenian

Taiwanese

21

Maturlty Rating

xxxxxx

Subtitle On

xxxxxx

Model

xxxxxx

Debug Menu On

xxxxxx

Notification Log

xxxxxx

UI Printf level

xxxxxx

[3] key [4] key

Software Upgrade Application 52232-0.25.03.0 (dev)

Upgrade menu Local upgrades/applications

Local upgrades/applications No software found on media

Current software info

I2C STOP MODE EDID WRITE PROTECT

[5] key [6] key

No display

Edid Write Protect

Enable

Back:EXIT

HDMI_EQ SETTING SOFTWARE VERSION CHECK

Software Version Check

HDMI EQ Setting

HDMI 1.3 compliant

[7] key [8] key

Back:EXIT

TVM 0123456789ABCDEF

E2PROM LCH60504-001A

CHM 8765-4321

Carib soft 0001

Carib data 0001

Build May 19 2008 12:34:56

Cancel

SOUND CALIBRATION SETTING

Calibration Setting

Secam-L ---

Secam-L' ---

Start

Cancel

Start

[9] key

(No.YA688<Rev.001>)1-17

4.4.5 SERVICE MODE ITEMS

S001 R DRIVE M 000

4.4.5.1 ADJUSTMENT MODE

This mode is used to adjust the VIDEO CIRCUIT.

 HOW TO ENTER THE ADJUSTMENT MODE

When the SERVICE MENU SCREEN of SERVICE MODE is
displayed, press [1] key to enter the ADJUSTMENT MODE.

4.4.5.2 MONITOR MODE

This mode displays the signal status of channel that has been
selected now.

4.4.5.3 SYSTEM CONFIGRATION

This mode selects the function that can be used by the user
menu.

 DESCRIPTION OF STATUS DISPLAY

ADJUSTMENT MODE

(2) SETTING ITEM NAME

S001 R DRIVE M 000

(3) SETTING ITEM No.

(1) COLOUR TEMP.

H: COOL
M : NORMAL
L: WARM

(2) SETTING ITEM NAME

Setting item name are displayed.

(3) SETTING ITEM NO.

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

(4) SETTING VALUE (DATA)

(1) COLOUR TEMP.

4.4.5.4 SOFTWARE UPDATE

This mode updates the version of software.

4.4.5.5 I2C STOP MODE [NO DISPLAY]

This mode is unused.

4.4.5.6 EDID WRITE PROTECT

This mode sets memory with EDID data to write protection.

4.4.5.7 HDMI_EQ SETTING

This mode switches HDMI1.3 compliant and AWG28.

4.4.5.8 SOFTWARE VERSION CHECK

This mode displays the version of microcomputer software and
memory.

4.4.5.9 SOUND CALIBRATION SETTING

This mode sets SOUND CALIBRATION.

Item No. Item Variable range Setting value

S001 R DRIVE 000 - 255 000

S002 G DRIVE 000 - 255 000

S003 B DRIVE 000 - 255 000

(4) SETTING VALUE (DATA)

The SETTING VALUE is displayed.

 CHANGE AND MEMORY OF SETTING VALUE

SELECTION OF SETTING ITEM

• [FUNCTION /] key.
For scrolling up / down the setting items.

CHANGE OF SETTING VALUE (DATA)

• [FUNCTION /] key.
For scrolling up / down the setting values.

MEMORY OF SETTING VALUE (DATA)

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

1-18 (No.YA688<Rev.001>)

4.5 ADJUSTMENT PROCEDURE

Item

SOUND
CALIBRATION

WHITE BALANCE
(HIGHLIGHT)

Measuring

instrument

Remote control unit [9. Calibration Setting] (1) Receive any bilingual broadcast.

Remote control unit

Signal generator

Adjustment part Description

(2) Select "9. Calibration Setting" from the SERVICE

MODE.
(3) Press the "OK" key to start the calibration.
(4) After "Finish" is displayed, press the [MENU] key to

exit the menu.

[1. Adjust]
S001: R DRIVE (Red drive)
S002: G DRIVE (Green drive)
S003: B DRIVE (Blue drive)

(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set COLOUR TEMP. to "NORMAL".
(5) Select "1. Adjust" from the SERVICE MODE.
(6) Adjust to Keep one of <S001> (Red drive),

<S002> (Green drive) or <S003> (Blue drive)

unchanged, then lower the other two so that the all-

white screen is equally white throughout.

NOTE:

Set one or more of <S001>, <S002>, and <S003>

to "000".

(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 memorize the set value.

SECTION 5

TROUBLESHOOTING

5.1 SELF CHECK FUNCTIONS

5.1.1 OUTLINE

This model has a "Self-diagnosis function," which checks the operation state of the circuits inside the set, and informs us of a failure.
Diagnosis is performed when the power is turned on, and information input to the main microcomputer is monitored at all time. The
diagnosis is displayed by LED flashing.

5.1.2 INDICATION OF SELF DIAGNOSIS BY USING LED

Flashing LEDs located on the front panel indicate the result of self-diagnosis.

Type of error POWER LED flash cycle

Low bias line short
protection

<Explanation of operation>

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

Repeating slow flashes 9 times and fast
flashes 9 times.

(No.YA688<Rev.001>)1-19

Victor Company of Japan, Limited

Display Division 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan

(No.YA688<Rev.001>)

Printed in Japan

VSE