Sony KLV-20G400A Schematic
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
SERVICE MANUAL
MODEL NAME REMOTE COMMANDER DESTINATION
KLV-20G400A
KLV-20G400A
RM-YA009 CANADA
RM-YA009 MEXICO
LAX2
CHASSIS
ORIGINAL MANUAL ISSUE DATE: 3/2008
:UPDATED ITEM
☛
REVISION DATE SUBJECT
3/2008 No revisions or updates are applicable at this time.
3/2008 Reissue entire manual to include Wire and PWB Diagrams.
10/2008 Removed Self Diagnosis logo from Front Cover and Self Diagnostic Function page.
Replaced pages 2 and 9.
LCD COLOR TELEVISION
9-883-773-03
SERVICE MANUAL
MODEL NAME REMOTE COMMANDER DESTINATION
LAX2
CHASSIS
KLV-20G400A
KLV-20G400A
RM-YA009 CANADA
RM-YA009 MEXICO
9-883-773-03
KLV-20G400A RM-YA009
LCD COLOR TELEVISION
KLV-20G400A
TABLE OF CONTENTS
SECTION TITLE PAGE
Specifi cations .........................................................................................................................................................................................................4
Warnings and Cautions ..........................................................................................................................................................................................5
Safety-Related Component Warning ......................................................................................................................................................................6
Safety Check-Out ...................................................................................................................................................................................................8
Self-Diagnostic Function .........................................................................................................................................................................................9
SECTION 1: DISASSEMBLY .......................................................................................................................................................................................10
1-1. Rear Cover Removal ....................................................................................................................................................................................10
1-2. Function Key Removal .................................................................................................................................................................................10
1-3. H3 Board Removal ....................................................................................................................................................................................... 11
1-4. H2 Board, IR Lens, and LED Lens Removal ................................................................................................................................................11
1-5. A Board and G Board Removal ....................................................................................................................................................................12
1-6. Stand Removal .............................................................................................................................................................................................13
1-7. Speakers, LCD Panel, and Main Bracket Removal .....................................................................................................................................13
Wire Dressing .......................................................................................................................................................................................................14
Overall View .................................................................................................................................................................................................14
SECTION 2: SERVICE ADJUSTMENTS ..................................................................................................................................................................... 15
2-1. Resetting to Factory Defaults after Board Replacement ..............................................................................................................................15
SECTION 3: DIAGRAMS .............................................................................................................................................................................................16
3-1. Circuit Boards Location ................................................................................................................................................................................16
3-2. Printed Wiring Boards and Schematic Diagrams Information ......................................................................................................................16
3-3. Block Diagram ..............................................................................................................................................................................................18
3-4. Connector Diagram ......................................................................................................................................................................................19
3-5. Frame Diagram ............................................................................................................................................................................................20
3-6. Schematics and Supporting Information ......................................................................................................................................................21
A Board Schematic Diagram (1 of 11) .......................................................................................................................................................... 21
A Board Schematic Diagram (2 of 11) .......................................................................................................................................................... 22
A Board Schematic Diagram (3 of 11) .......................................................................................................................................................... 23
A Board Schematic Diagram (4 of 11) .......................................................................................................................................................... 24
A Board Schematic Diagram (5 of 11) .......................................................................................................................................................... 25
A Board Schematic Diagram (6 of 11) .......................................................................................................................................................... 26
A Board Schematic Diagram (7 of 11) .......................................................................................................................................................... 27
A Board Schematic Diagram (8 of 11) .......................................................................................................................................................... 28
A Board Schematic Diagram (9 of 11) .......................................................................................................................................................... 29
A Board Schematic Diagram (10 of 11) ........................................................................................................................................................ 30
A Board Schematic Diagram (11 of 11) ........................................................................................................................................................ 31
H1 Board Schematic Diagram ......................................................................................................................................................................34
H2 Board Schematic Diagram ......................................................................................................................................................................35
H3 Board Schematic Diagram ......................................................................................................................................................................36
SECTION 4: EXPLODED VIEWS ................................................................................................................................................................................ 37
4-1. Rear Cover Assembly and Stand Assembly ................................................................................................................................................37
4-2. Chassis ........................................................................................................................................................................................................38
KLV-20G400A
3
SPECIFICATIONS
KLV-20G400A
Power Requirements
110V - 240V AC, 50/60Hz
Video (IN) 1/2
S Video (4-Pin Mini DIN)
Y: 1.0 Vp-p, 75 ohms unbalanced, sync negative
C: 0.286 Vp-p (Burst signal), 75 ohms
Video
1.0 Vp-p, 75ohms unbalanced, sync negative
Audio
500 mVrms (100% modulation)
Impedance:47 kilohms
COMPONENT IN 3
YP
Y:1.0 Vp-p, 75 ohms unbalanced, sync negative
PB:0.7 Vp-p, 75 ohms
PR:0.7 Vp-p, 75 ohms
Signal format: 480i, 480p, 720p, 1080i
AUDIO
500 mVrms (100% modulation)
Impedance: 47 kilohms
AUDIO OUT:
500 mVrms (100% modulation)
HEADPHONES:
Stereo mini jack
Impedance: 16 ohms
(Component Video)
BPR
Television system
NTSC American TV Standard
Channel coverage
Analog
Terrestrial 2-69
Cable 1-135
Antenna
75-ohm external terminal for VHF/UHF
Panel System
LCD (Liquid Crystal Display) Panel
Display Resolution (horizontal x vertical):
640 dots x 480 lines
Screen Size (measured diagonally)
approx. 20 inches
Supplied Accessories
Remote Commander RM-YA009
Two Size AA (R6) Batteries
AC Power Cord
Cable Band
Operating Instructions
Quick Setup Guide
Warranty Card
KLV-20G400A
Power Consumption
in use
in standby Less than 1W
Speaker Output (W)
mm 45 x 130 mm
Dimensions (W x H x D)
with stand
mm
Dimensions (W x H x D)
without stand
mm
Mass
with stand
without stand
All measurements are approximations.
KLV-20G400A
3W + 3W
13/16
in
in
in
kg
lbs
kg
lbs
1
609 x 427 x 196 mm
24 x 16
609 x 384 x 80 mm
24 x 15
8.7 kg
19 lbs 2
7.5 kg
16 lbs 8
48W
x 5
7/8
1/8
1/8
x 7
x 3
7/8
1/2
in
3/4
1/4
OZ
OZ
in
in
Optional Accessories
Headphones Plug Adapter
Connecting Cables
Support Belt Kit
Wall-Mount Bracket
SU-WL100
Trademark Information
“BRAVIA” and , , BRAVIA
Theatre Sync and DMPORT are trademarks or
registered marks of Sony Corporation.
Design and specifi cations are subject to change without notice.
4
KLV-20G400A
WARNINGS AND CAUTIONS
CAUTION
These servicing instructions are for use by qualifi ed service personnel only. To reduce the risk of electric shock, do not perform any servicing other
than that contained in the operating instructions unless you are qualifi ed to do so.
CARRYING THE TV
To avoid dropping the TV and causing serious injury, be sure to follow
these guidelines:
s Before carrying the TV, disconnect all cables.
s Carrying the large size TV requires two or more people.
s When you carry the TV, place your hand as illustrated and hold it
securely. Do not put stress on the LCD panel.
s When lifting or moving the TV, hold it firmly from the bottom. Place
your palm directly under the panel.
s When carrying, do not subject the TV to shocks or vibration, or
excessive force.
s Place your palm directly underneath, but do not squeeze the
panel’s speaker grill area.
WARNING!!
An isolation transformer should be used during any service to avoid possible shock hazard, because of live chassis. The chassis of this receiver is
directly connected to the ac power line.
! SAFETY-RELATED COMPONENT WARNING!!
Components identifi ed by shading and ! mark on the schematic diagrams, exploded views, and in the parts list are critical for safe operation. Replace
these components with Sony parts whose part numbers appear as shown in this manual or in supplements published by Sony. Circuit adjustments that
are critical for safe operation are identifi ed in this manual. Follow these procedures whenever critical components are replaced or improper operation is
suspected.
ATTENTION!!
Ces instructions de service sont à l’usage du personnel de service qualifi é seulement. Pour prévenir le risque de choc électrique, ne pas faire
l’entretien autre que celui contenu dans le Mode d’emploi à moins que vous soyez qualifi é faire ainsi.
POUR TRANSPORTER LE TÉLÉVISEUR
s Le transport du téléviseur doit être effectué par au moins deux
personnes.
s Lorsque vous le transportez, placez vos mains tel que cela est illustré
et tenez solidement l’appareil. N’appliquez pas de pression sur
l’écran ACL.
s Lorsque vous transportez le téléviseur, ne le soumettez pas à des
chocs ou vibrations, ni à une force excessive.
s Positionnez votre paume directement sous l’appareil et veillez à
ne pas exercer de pression contre la grille des haut-parleurs
du panneau.
Afi n d’eviter tout risque d’electrocution provenant d’un chássis sous tension, un transformateur d’isolement doit etre utilisé lors de tout dépannage. Le
chássis de ce récepteur est directement raccordé à l’alimentation du secteur.
! ATTENTION AUX COMPOSANTS RELATIFS A LA SECURITE!!
Les composants identifi es par une trame et par une marque ! sur les schemas de principe, les vues explosees et les listes de pieces sont d’une
importance critique pour la securite du fonctionnement. Ne les remplacer que par des composants Sony dont le numero de piece est indique dans le
present manuel ou dans des supplements publies par Sony. Les reglages de circuit dont l’importance est critique pour la securite du fonctionnement
sont identifi es dans le present manuel. Suivre ces procedures lors de chaque remplacement de composants critiques, ou lorsqu’un mauvais
fonctionnement suspecte.
KLV-20G400A
5
SAFETY-RELATED COMPONENT WARNING
KLV-20G400A
There are critical components used in LCD color TVs that are important for safety. These components are identifi ed with shading and
mark on the schematic diagrams and the electrical parts list. It is essential that these critical parts be replaced only with the part number
specifi ed in the electrical parts list to prevent electric shock, fi re, or other hazard.
NOTE: Do not modify the original design without obtaining written permission from the manufacturer or you will void the original parts and
labor guarantee.
!
USE CAUTION WHEN HANDLING THE LCD PANEL
When repairing the LCD panel, be sure you are grounded by using a wrist band.
When installing the LCD panel on a wall, the LCD panel must be secured using the 4 mounting holes on the rear cover.
To avoid damaging the LCD panel:
do not press on the panel or frame edge to avoid the risk of electric shock.
do not scratch or press on the panel with any sharp objects.
do not leave the module in high temperatures or in areas of high humidity for an extended period of time.
do not expose the LCD panel to direct sunlight.
avoid contact with water. It may cause a short circuit within the module.
disconnect the AC adapter when replacing the backlight (CCFL) or inverter circuit.
(High voltage occurs at the inverter circuit at 650Vrms.)
always clean the LCD panel with a soft cloth material.
use care when handling the wires or connectors of the inverter circuit. Damaging the wires may cause a short.
protect the panel from ESD to avoid damaging the electronic circuit (C-MOS).
LEAKAGE CURRENT HOT CHECK CIRCUIT
KLV-20G400A
6
The circuit boards used in these models have been processed using
Lead Free Solder. The boards are identified by the LF logo located
close to the board designation e.g. H1 etc [ see example ]. The
servicing of these boards requires special precautions to be taken as
outlined below.
KLV-20G400A
example 1
It is strongly recommended to use Lead Free Solder material in order to guarantee optimal quality of new solder joints.
Lead Free Solder is available under the following part numbers :
rebmuntraP retemaiD skrameR
91-500-046-7mm3.0gK52.0
02-500-046-7mm4.0gK05.0
12-500-046-7mm5.0gK05.0
22-500-046-7mm6.0gK52.0
32-500-046-7mm8.0gK00.1
42-500-046-7mm0.1gK00.1
52-500-046-7mm2.1gK00.1
62-500-046-7mm6.1gK00.1
Due to the higher melting point of Lead Free Solder the soldering iron tip temperature needs to be set to 370 degrees centigrade.
This requires soldering equipment capable of accurate temperature control coupled with a good heat recovery characteristics.
For more information on the use of Lead Free Solder, please refer to
http://www.sony-training.com
KLV-20G400A
7
SAFETY CHECK-OUT
KLV-20G400A
After correcting the original service problem, perform the following
safety checks before releasing the set to the customer:
1. Check the area of your repair for unsoldered or poorly soldered
connections. Check the entire board surface for solder splashes and
bridges.
2. Check the interboard wiring to ensure that no wires are “pinched” or
touching high-wattage resistors.
3. Check that all control knobs, shields, covers, ground straps, and
mounting hardware have been replaced. Be absolutely certain that
you have replaced all the insulators.
4. Look for unauthorized replacement parts, particularly transistors,
that were installed during a previous repair. Point them out to the
customer and recommend their replacement.
5. Look for parts which, though functioning, show obvious signs of
deterioration. Point them out to the customer and recommend their
replacement.
6. Check the line cords for cracks and abrasion. Recommend the
replacement of any such line cord to the customer.
7. Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC leakage. Check leakage as
described below.
The AC leakage from any exposed metal part to earth ground and
from all exposed metal parts to any exposed metal part having a
return to chassis, must not exceed 0.5 mA (500 microamperes).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instructions.
2. A battery-operated AC milliampmeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a VOM
or battery-operated AC voltmeter. The “limit” indication is 0.75
V, so analog meters must have an accurate low voltage scale.
The Simpson’s 250 and Sanwa SH-63TRD are examples of
passive VOMs that are suitable. Nearly all battery-operated digital
multimeters that have a 2 VAC range are suitable (see Figure A).
How to Find a Good Earth Ground
A cold-water pipe is a guaranteed earth ground; the cover-plate
retaining screw on most AC outlet boxes is also at earth ground. If the
retaining screw is to be used as your earth ground, verify that it is at
ground by measuring the resistance between it and a cold-water pipe
with an ohmmeter. The reading should be zero ohms.
If a cold-water pipe is not accessible, connect a 60- to 100-watt
trouble- light (not a neon lamp) between the hot side of the receptacle
and the retaining screw. Try both slots, if necessary, to locate the hot
side on the line; the lamp should light at normal brilliance if the screw
is at ground potential (see Figure B).
Leakage Test
0.15 μF
Figure A. Using an AC voltmeter to check AC leakage. Figure B. Checking for earth ground.
To Exposed Metal
Parts on Set
Earth Ground
AC
Voltmeter
(0.75V)
Trouble Light
AC Outlet Box
Ohmmeter
Cold-water Pipe
KLV-20G400A
8
KLV-20G400A
SELF-DIAGNOSTIC FUNCTION
IMPORTANT:
The unit in this manual DOES NOT contain a self-diagnostic function. If an error occurs, the TV will not stay on. It is our recommendation that if a
repair is required for this set, the technician should bring both the A Board and the G Board to the customer location.
Control Buttons
PIC OFF/TIMER
Description of LED Indictors
The unit in this manual DOES NOT contain a self-diagnostic function.
POWER
KLV-20G400A
9
1-1. REAR COVER REMOVAL
1
Remove 2 screws from top of Rear Cover, +BVTP 3X10
2
Remove 2 screws, +PSW M4X12
3
Remove 4 screws from Terminal area, +BVTP 3X10
4
Remove 2 screws, +PSW M4X12
5
Remove 2 screws, +PSW M4X12
6
Remove 8 screws from both sides of Rear Cover, -BVTP 4X12
NOTE: The Vesa Brackets are not included in the Rear Cover Assembly. If you are replacing the
Rear Cover you must proceed to step 7.
7
Remove 4 screws to detach the 2 Vesa Brackets from the Rear Cover. Save the screws and the brackets
and put them into the replacement Rear Cover.
KLV-20G400A
SECTION 1: DISASSEMBLY
Bezel
6
1-2. FUNCTION KEY REMOVAL
1
Remove from Bezel
2
Release hooks
3
Disconnect one connector from the H1 Board.
Key Cover
Function Key
Rear Cover
1
2
3
4
5
7
Vesa Breacket
Rear Cover
1
2
3
KLV-20G400A
H1 Board
Bezel
10
1-3. H3 BOARD REMOVAL
1
Remove 1 screw from the H3 Board.
2
Disconnect one connector
2
Remove 1 screw +PSW M3X6 and release the ground wire
KLV-20G400A
Bezel
H3 Board
1
3
2
1-4. H2 BOARD, IR LENS, AND LED LENS REMOVAL
1
Remove 3 screws, +BVTP 3X10 from H2 Board
2
Disconnect one connector
KLV-20G400A
Bezel
IR Lens
LED Lens
H2 Board
2
1
11
1-5. A BOARD AND G BOARD REMOVAL
1
Remove 2 screws and release ground wire, +PSW M3X6
2
Remove 2 screws from bottom of Main Shield, +FH 3X4
3
Remove 4 screws, +PSW M3X6
4
Remove 1 screw (+FH 3X4) and a Hex Nut from Tuner
5
Remove 7 screws, +PSW M3X6
6
Disconnect 6 connectors
7
Remove 5 screws, +PSW M3X6
8
Disconnect 8 connectors
9
Release 1 PWB Holder
10
Slide out AC inlet with the G Board from the Main Bracket.
KLV-20G400A
Main Bracket
B Board
A Board
8
9
10
7
6
4
5
Main Shield
1
2
3
KLV-20G400A
12
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