JVC LT-37DS6BJ Service Manual

Preliminary
SERVICE MANUAL
LCD INTEGRATED DIGITAL TV
YA29920056
LT-37DS6BJ, LT-37DS6BJ
BASIC CHASSIS
FL2
TABLE OF CONTENTS
1 PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
COPYRIGHT © 2005 Victor Company of Japan, Limited
No.YA299
2005/6
SPECIFICATION
Items Contents
Dimensions ( W × H × D ) 92.6 cm × 68.9 cm × 29.7 cm [Included stand]
92.6 cm × 63.1 cm × 10.8 cm [TV only]
Mass 26.0 kg [Included stand]
20.9 kg [TV only]
Power Input AC110V - AC240 V, 50 Hz / 60 Hz
Power Consumption 183 W (Standby: 2.6 W)
TV RF System Analog
Colour System PAL / NTSC 3.58/4.43 [EXT only]
Stereo System NICAM (I)
Receiving Frequency Analog
Intermediate Frequency
Colour Sub Carrier Frequency
Teletext System Analog
LCD panel 37V-inch wide aspect (16 : 9)
Screen Size Diagonal : 94.9 cm (H: 82.6 cm × V: 46.7 cm) Display Pixels Horizontal : 1366 dots × Vertical : 768 dots (W-XGA)
Audio Power Output 10 W + 10 W
Speaker 6.6 cm, round type × 2 (Oblique corn) Aerial terminal (VHF/UHF) 75 unbalanced, coaxial EXT-1 / EXT-2 (Input / Output) 21-pin Euro connector (SCART socket ) × 2
EXT-3 (Input) S-Video
EXT-4 (Input) Component Video
625p / 525p / 625i / 525i
HDMI Input Video
PC (RGB) Input D-sub 15 pin × 1
Audio output 500 mV (rms), Low impedance, RCA pin jack × 2 Headphone 3.5 mm stereo mini jack × 1 Remote Control Unit RM-C1813H (AA/R6 dry cell battery × 2)
Design & specifications are subject to change without notice.
CCIR (I)
Digital
DVB-T
UHF: 470 MHz - 862 MHz
Digital
UHF: 474 MHz - 850 MHz
VIF
38.9 MHz (I)
SIF
32.9 MHz (6.0 MHz :I)
PAL
4.43 MHz
NTSC
3.58 MHz / 4.43 MHz
FLOF (Fastext level 2.5), WST(World Standard system)
Digital
MHEG 5 UK profile
Mini-DIN 4 pin × 1 Y: 1 V (p-p), Positive (Negative sync provided), 75 C: 0.286 V (p-p) (Burst signal), 75
Video
1 V (p-p), Positive (Negative sync provided), 75 , RCA pin jack × 1
Audio
500 mV (rms), High impedance, RCA pin jack × 2 RCA pin jack × 3
Y : 1 V (p-p) (Sync signal: ±0.35V(p-p), 3-value sync.), 75
1125i
Pb/Pr : ±0.35V(p-p), 75 Y : 1 V (p-p), Positive (Negative sync provided), 75 Cb/Cr : 0.7V(p-p), 75
Audio
500 mV(rms) (-4dBs), high impedance, RCA pin jack × 2 HDMI connector × 1
(Digital-input terminal is not compatible with picture signals of computer signal)
Audio
Digital: HDMI connector × 1 Anarog: 500mV(rms) (-4dBs), high impedance, RCA pin jack × 2
R/G/B : 0.7 V (p-p), 75
HD / VD : 1 V (p-p) to 5 V (p-p), high impedance < Available signal >
VGA : 640 pixels × 480 pixels (Horizontal : 31.5 kHz / Vertical : 60 Hz) XGA : 1024 pixels × 768 pixels (Horizontal : 48.4 kHz / Vertical : 60 Hz)
1-2 (No.YA299)
SECTION 1
PRECAUTION
1.1 SAFETY PRECAUTIONS
(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.
(No.YA299)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.YA299)
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 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.
1.3.3 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 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).
(No.YA299)1-5
2.1 SYSTEM SETTEING
LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK
SERVICE MENU
1.ADJUST
2.SELF_CHK
3.I2C STOP
SECTION 2
SPECIFIC SERVICE INSTRUCTIONS
Be sure to carry out the following operation at the end of the procedure.
(1) Press the [INFORMATION] key and [MUTING] key
simultaneously, then enter the SERVICE MODE.
(2) When the Main Menu is displayed, press [2] key to enter
the self check mode.
(3) Turn off the power by pressing the [POWER] key on the
remote control unit.
2.2 FEATURES
DVB-T (DIGITAL TERRESTRIAL BROADCASTING)
This TV can receive both Digital terrestrial broadcasting (DVB­T) 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.
MAIN MENU SCREEN
SERVICE MENU
1.ADJUST
2.SELF_CHK
3.I2C STOP
SELF CHECK MODE SCREEN
LOB OK FAN OK SYNC M:OK S:OK HD:NG TIM OK MSM OK DIGI 0000 MEM OK AVSW OK YC OK AIO OK TUN OK GCR NG 1 IP OK RGB OK 8 DVI OK HDMI OK
ZOOM
This function can change the screen size according to the picture aspect ratio.
DIGITAL VNR
This function cuts down the amount of noise in the original picture.
SUPER DIGIPURE
This function uses the latest in digital technology to give you a natural-looking picture.
MOVIE THEATRE
This function displays a cinema film picture more smoothly and naturally on the screen.
3D CINEMA SOUND
You can enjoy sounds with a widerambience.
2.3 MAIN DIFFERENCE LIST
Item LT-37DS6BJ LT-37DS6BJ/P
DIGITAL SIGNAL PWB ----- -----
1-6 (No.YA299)
2.4 HOW TO IDENTIFY MODELS
"PE" are added to the serial No. under at the Rating label.
MODEL No.
SERIAL NO. NUMERO DE SERIE
LT-37DS6BJ
PE
Indicated
2.5 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
, 75 Used Used
(B-W)
Used Used
9 GND (G) Used Used
10 SCL / T-V LINK Not used Used (SCL2 / TV-LINK)
11 G input 700mV
, 75 Used Used
(B-W)
12 SDA Not used Used (SDA2)
13 GND (R) Used Used
14 GND (YS) Used Not used
15 R / C input R : 700mV
C : 300mV
(B-W) (P-P)
, 75
, 75
Used (R) Used (C2/R)
16 Ys input (FAST SW) Low : 0V-0.4V, High : 1V-3V, 75 Used Used
17 GND (VIDEO output) Used Used
18 GND (VIDEO input) Used Used
19 VIDEO output 1V
20 VIDEO / Y input 1V
(Negative sync), 75 Used (TV OUT) Used (LINE OUT)
(P-P)
(Negative sync), 75 Used Used
(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.YA299)1-7
2.6 TECHNICAL INFORMATION
2.6.1 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.
2.6.1.1 SPECIFICATIONS
The following table shows the specifications of this unit.
Item Specifications
Maximum dimensions ( W × H × D ) 877 mm × 545 mm × 56 mm
Weight 8.5 kg
Effective screen size Diagonal: 949 mm (H: 826 mm × V: 467 mm)
Aspect ratio 16 : 9
Drive device / system a-Si-TFT active matrix system
Resolution Horizontally 1366 × Vertically 768 × RGB < W-XGA > 3147264 dots in total
Pixel pitch (pixel size) Horizontally: 0.6 mm Vertically: 0.6 mm
Displayed colour 16777216 colours 256 colours for R G and B
Brightness 500cd/m2
Contrast ratio 800 : 1
Response time 6 ms
View angle Horizontally: 170° , Vertically: 170°
Surface polarizer Anti-Glare type Low reflective coat
Colour filter Vertical stripe
Backlight Direct-type Cold cathode fluorescent lamp × 18
Power supply voltage in LCD 5 V
Power supply voltage in inverter 24 V
Panel interface system LVDS (Low Voltage Differential Signaling)
2.6.1.2 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.YA299)
2.6.2 MAIN CPU PIN FUNCTION [IC7501 : DIGITAL SIGNAL PWB]
Pin Pin name I/O Function Pin Pin name I/O Function
1 TCK I Test purpose 65 D2 I/O Program ROM data for main CPU 2 TMS I Test purpose 66 D12 I/O Program ROM data for main CPU 3 TDI I Test purpose 67 D10 I/O Program ROM data for main CPU 4 TDO O Test purpose 68 VSS33 - GND 5 P2.8 O Not used 69 VDD33 I 3.3V 6 P2.9 O Blue for OSD 70 D4 I/O Program ROM data for main CPU 7 P2.10 O Blue for OSD 71 D3 I/O Program ROM data for main CPU 8 P2.11 O Blue for OSD 72 D11 I/O Program ROM data for main CPU
9 P2.12 O Blue for OSD 73 RSTIN I Reset 10 P2.13 O Blue for OSD 74 POWER O Sleep state release for chassis CPU [Relese : L] 11 P2.14 I Not used 75 P3.1 O Not used 12 P2.15 O Request for chassis CPU communication 76 REMOCON I Remote control 13 VSS33 - GND 77 P3.3 I Clock for OSD 14 VDD33 I 3.3V 78 P3.4 O Red for OSD 15 P4.5 O Not used 79 P3.5 O Red for OSD 16 A20 O Program ROM address for main CPU 80 P3.6 O Red for OSD 17 A19 O Program ROM address for main CPU 81 P3.7 O Red for OSD 18 A18 O Program ROM address for main CPU 82 MTST O Data transmission for chassis CPU communication 19 A17 O Program ROM address for main CPU 83 MTSR I Data receive for chassis CPU communication 20 VSS25 - GND 84 VSS33 - GND 21 VDD25 I 2.5V 85 VDD33 I 3.3V 22 A16 O Program ROM address for main CPU 86 VSS25 - GND 23 A8 O Program ROM address for main CPU 87 VDD25 I 2.5V 24 A7 O Program ROM address for main CPU 88 TXD0 O Communication for adjustment 25 A9 O Program ROM address for main CPU 89 RXD0 O Communication for adjustment 26 A6 O Program ROM address for main CPU 90 P3.12 O Red for OSD 27 A5 O Program ROM address for main CPU 91 CLK O Clock for chassis CPU communication 28 A10 O Program ROM address for main CPU 92 P3.15 O Green for OSD 29 A11 O Program ROM address for main CPU 93 P5.14 O Green for OSD 30 A12 O Program ROM address for main CPU 94 P5.15 O Green for OSD 31 VSS33 - GND 95 TRIG_IN O Green for OSD 32 VDD33 I 3.3V 96 TRIG_OUT O Green for OSD 33 A4 O Program ROM address for main CPU 97 P6.2 O Green for OSD 34 A3 O Program ROM address for main CPU 98 P6.3 O I 35 A2 O Program ROM address for main CPU 99 P6.4 I/O I 36 A1 O Program ROM address for main CPU 100 P6.5 O Teletext signal select [Analog RGB : H / Digital RGB : L] 37 A0 O Program ROM address for main CPU 101 IRQ O Not used 38 A13 O Program ROM address for main CPU 102 VSYNC I Vertical sync 39 ARAS/A14 O Program ROM address for main CPU 103 HSYNC I Horizontal sync 40 CAS/A15 O Program ROM address for main CPU 104 41 VSS33 - GND 105 BLANK O Ys for OSD / Teletext 42 VDD33 I 3.3V 106 VDD33 I 3.3V 43 MEMCLK O Clock for memory 107 VSS33 - GND 44 CSSDRAM O Chip select for memory 108 XTAL1 I 6MHz for system clock 45 CLKEN O Clock enable for memory 109 XTAL2 O 6MHz for system clock 46 CSROM O Chip select for memory 110 VSSA - GND 47 RD O Read for memory 111 VDDA I 2.5V 48 UDQM O Control buffer of memory 112 R O R for OSD / Teletext 49 LDQM O Control buffer of memory 113 G O G for OSD / Teletext 50 WR O Write for memory 114 B O B for OSD / Teletext 51 D15 I/O Program ROM data for main CPU 115 VSSA - GND 52 VSS33 - GND 116 VDDA I 2.5V 53 VDD33 I 3.3V 117 CVBS2 I Video for Teletext 54 D7 I/O Program ROM data for main CPU 118 VSSA - GND 55 D0 I/O Program ROM data for main CPU 119 VDDA I 2.5V 56 D14 I/O Program ROM data for main CPU 120 CVBS1B I Video for Teletext 57 D8 I/O Program ROM data for main CPU 121 CVBS1A I Video for Teletext 58 D6 I/O Program ROM data for main CPU 122 VSSA - GND 59 D1 I/O Program ROM data for main CPU 123 VDDA I 2.5V 60 VSS33 - GND 124 KEY1 I Key scan data 1 [ON : H] 61 VDD33 I 3.3V 125 KEY2 I Key scan data 2 [ON : H] 62 D13 I/O Program ROM data for main CPU 126 MECA_SW I Main power ON / OFF control [ON : L] 63 D9 I/O Program ROM data for main CPU 127 P5.3 I Not used 64 D5 I/O Program ROM data for main CPU 128 TMODE I Test purpose
COR/RSTOUT
2
C bus clock (for main memory)
2
C bus Data (for main memory)
O Not used
(No.YA299)1-9
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