Advertisement
Quick Links
Download this manual
See also:
Instruction Manual
SERVICE MANUAL
LCD INTEGRATED DIGITAL TV
6
2005
YA299
1
PRECAUTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
2
SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
3
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-11
4
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-18
5
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25
LT-37DS6BJ,
LT-37DS6BJ
TABLE OF CONTENTS
COPYRIGHT © 2005 Victor Company of Japan, Limited
Preliminary
/P
BASIC CHASSIS
FL2
No.YA299
2005/6
Advertisement
Related Manuals for JVC LT-37DS6BJ
Summary of Contents for JVC LT-37DS6BJ
-
Page 1: Table Of Contents
SERVICE MANUAL LCD INTEGRATED DIGITAL TV YA299 2005 LT-37DS6BJ, LT-37DS6BJ BASIC CHASSIS TABLE OF CONTENTS PRECAUTION............... . . 1-3 SPECIFIC SERVICE INSTRUCTIONS . - Page 2 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...
-
Page 3: Precaution
SECTION 1 PRECAUTION 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. - Page 4 INSTALLATION 1.2.1 HEAT DISSIPATION 1.2.3 INSTALLATION REQUIREMENTS If the heat dissipation vent behind this unit is blocked, cooling To ensure safety in an emergency such as an earthquake, and efficiency may deteriorate and temperature inside the unit will to prevent accidents, ensure that measures are taken to prevent rise.
- Page 5 HANDLING LCD PANEL 1.3.1 PRECAUTIONS FOR TRANSPORTATION 1.3.2 OPTICAL FILTER (ON THE FRONT OF THE LCD PANEL) When transporting the unit, pressure exerted on the internal LCD (1) Avoid placing the unit under direct sunlight over a panel due to improper handling (such as tossing and dropping) prolonged period of time.
-
Page 6: Specific Service Instructions
3D CINEMA SOUND You can enjoy sounds with a widerambience. MAIN DIFFERENCE LIST Item LT-37DS6BJ LT-37DS6BJ/P DIGITAL SIGNAL PWB ----- ----- 1-6 (No.YA299) - Page 7 HOW TO IDENTIFY MODELS "PE" are added to the serial No. under at the Rating label. MODEL No. LT-37DS6BJ SERIAL NO. NUMERO DE SERIE Indicated 21-PIN EURO CONNECTOR (SCART) : EXT-1 / EXT-2 Pin No. Signal designation Matching value EXT-1...
- Page 8 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.
- Page 9 2.6.2 MAIN CPU PIN FUNCTION [IC7501 : DIGITAL SIGNAL PWB] Pin name Function Pin name Function Test purpose I/O Program ROM data for main CPU Test purpose I/O Program ROM data for main CPU Test purpose I/O Program ROM data for main CPU Test purpose VSS33 P2.8...
- Page 10 2.6.3 SUB (CHASSIS) CPU PIN FUNCTION [IC7001 : DIGITAL SIGNAL PWB] Pin name Function Pin name Function LB_PRO Not used BS_TXD Data transmission for digital tuner communication P_MU Picture muting [Muting = H] BS_RXD Data receive for digital tuner communication JP_CSB Not used (NC) Not used (NC)
-
Page 11: Disassembly
SECTION 3 DISASSEMBLY 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. •... - Page 12 JACK COVER STAND COVER JACK COVER STAND TUNER BASE FAN BRACKET SHIELD COVER REGULATOR PWB SIDE SHIELD CASE REAR COVER DIGITAL POWER PWB TUNER UNIT RECEIVER PWB POWER CORD POWER CORD HOLDER TOP SHIELD CASE RECEIVER PWB BRACKET DIGITAL BRACKET ANALOG SIGNAL PWB CONNECTOR PWB DIGITAL SIGNAL PWB...
- Page 13 3.1.11 REMOVING THE SPEAKER (Fig.2) 3.1.13 REMOVING THE LCD PANEL UNIT (Fig.2) • Remove the STAND. • Remove the STAND. • Remove the REAR COVER. • Remove the REAR COVER. (1) Remove the 6 screws [A], then remove the SPEAKER (L /R). •...
- Page 14 MAIN BASE BOTTOM FRAME TOP FRAME SPEAKER FRONT LED PWB SPEAKER FRONT PANEL FRONT Fig.2 1-14 (No.YA299)
- Page 15 MEMORY IC REPLACEMENT • 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 REPLACEMENT PROCEDURE 1.
- Page 16 3.2.3 SETTINGS OF FACTORY SHIPMENT 3.2.3.1 BUTTON OPERATION 3.2.3.2 REMOTE CONTROL DIRECT OPERATION Setting item Setting position Setting item Setting position POWER CHANNEL CHANNEL VOLUME VOLUME ZOOM PANORAMIC TV/AV 3D SOUND 3.2.3.3 REMOTE CONTROL MENU OPERATION (1) PICTURE (4) FEATURES Setting item Setting position Setting item...
- Page 17 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.
-
Page 18: Adjustment
SECTION 4 ADJUSTMENT ADJUSTMENT PREPARATION ADJUSTMENT ITEMS (1) The adjustment using the REMOTE CONTROL UNIT is VIDEO CIRCUIT made on the basis of the initial setting values. The set- • 625i A-D OFFSET adjustment ting values which adjust the screen to the optimum •... - Page 19 4.5.3 DESCRIPTION OF STATUS DISPLAY (5) SETTING ITEM NAME Setting item name are displayed. The setting item numbers to SETTINGITEM No. SETTING ITEM SETTING VALUE (DATA) be displayed are listed below. Item No. Setting item S001 to S039 Video system setting S001 PREPARE S001 PREPARE PAL50...
- Page 20 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.
- Page 21 Item No. Item name Variable range Setting value Item No. Item name Variable range Setting value D020 SYH CON 00 - 3F D070 (Not display) 00 - FF D021 SYH CONF 00 - 01 D071 (Not display) 00 - FF D022 SC CON 00 - 3F...
- Page 22 Item No. Item name Variable range Setting value Item No. Item name Variable range Setting value D120 (Not display) 00 - FF D170 (Not display) 00 - FF D121 (Not display) 00 - FF D171 (Not display) 00 - FF D122 (Not display) 00 - FF...
- Page 23 ADJUSTMENT PROCEDURE 4.7.1 VIDEO CIRCUIT Measuring Item Test point Adjustment part Description instrument 625i Remote [1.ADJUST] (1) Receive a 625i component ramp pattern signal. A-D OFFSET control unit S001: PREPARE (2) Set PICTURE MODE to "STANDARD". (Adjustment setting mode change) (3) Set ZOOM to "FULL".
- Page 24 Measuring Item Test point Adjustment part Description instrument SUB SCREEN Remote [1.ADJUST] (1) Set PICTURE MODE to "STANDARD". A-D OFFSET control unit S001: PREPARE (2) Set ZOOM" to "FULL". (Adjustment setting mode change) (3) Set COLOUR TEMP. to "NORMAL". Signal (4) Set MULTI SCREEN to "2 pictures".
-
Page 25: Troubleshooting
SECTION 5 TROUBLESHOOTING SELF CHECK FEATURE 5.1.5 POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE 5.1.1 OUTLINE In addition to circuit failures (abnormal operation), the following This unit comes with the "Self check" feature, which checks the cases may also be iagnosed as "Abnormal" and displayed and operational state of the circuit and displays/saves it during counted as "NG". - Page 26 5.1.6 DETAILS Self check is performed for the following items: < Page 1 of screen > Diagnosis Detection item Display Detection content Detection timing signal (line) Low bias line short Confirmation of operation of the low bais LB_PRO Detection starts 3 seconds after the protection (2.5V / 3.3V / 5V / 9V) protection circuit.
- Page 27 < Page 2 of screen > Diagnosis Detection item Display Detection content Detection timing signal (line) Fan lock Not used. Abnormal of operation of Not used. PANEL Abnormal rise of Not used. temperature in PANEL Abnormal rise of Not used. temperature in audio circuit Short circuit detection of...
- Page 28 Victor Company of Japan, Limited AV & MULTIMEDIA COMPANY DISPLAY CATEGORY 12, 3-chome, Moriya-cho, Kanagawa-ku, Yokohama-city, Kanagawa-prefecture, 221-8528, Japan (No.YA299) Printed in Japan...