KDL-55W900A — Sony TV Service Manual (repair manual)

Model
KDL-55W900A
Pages
28
Size
4.22 MB
Type
PDF
Document
Service Manual
Brand
Device
TV
File
kdl-55w900a.pdf
Date

View Sony KDL-55W900A Service Manual online

REPAIR MANUAL
Self Diagnosis
Supported model
HISTORY INFORMATION FOR THE FOLLOWING MANUAL:
LCD Digital Color TV
9-883-520-02
RB1G 
Chassis
 
Segment: HG
Version Date 
Subject
1.0  
04/26/2013 
Original Manual Release Date.
2.0 
08/09/2013 
Updated Section 2 - Troubleshooting and Section 3 - Repair Information. Replaced pages 12 - 17.
 
 
Caution included on Cautions and Warnings Section. Replaced page ii.
  MODEL 
    COMMANDER 
DESTINATION
KDL-55W900A 
 RM-YD087/RMF-YD001 
US/CND
 
 
KDL-55W900A
KDL-55W900A i
TABLE OF CONTENTS
Cautions and Warnings ...................................................................................ii
Section 1 - Specifications and Layouts .........................................................1
Specifications ................................................................................................1
Checking the Accesories .......................................................................................1
Board Layout .................................................................................................2
KDL-55W900A .......................................................................................................2
Smart Core Block...................................................................................................2
Wire Dressing ................................................................................................3
KDL-55W900A .......................................................................................................3
Smart Core Block...................................................................................................3
Section 2 - Troubleshooting ...........................................................................4
Diagnosing the Error .....................................................................................4
Viewing the Self Check Diagnosis History ............................................................. 4
Triage Chart ...................................................................................................5
Flowcharts and Diagrams ..............................................................................6
Overall Block Diagram ...........................................................................................6
Power and Control Block Diagram.........................................................................7
No Power Flowchart ..............................................................................................8
Standby LED Blinking Flowchart ...........................................................................9
No Video Flowchart .............................................................................................10
Video Distortion Flowchart ................................................................................... 11
Section 3 - Repair Information ......................................................................12
Repairing the TV ..........................................................................................12
Removing the Table-Top Stand ............................................................................12
Removing the Rear Cover ...................................................................................12
Replacing the Main Board ...........................................................................13
Replacing the Power Supply Board .............................................................16
Replacing the Switch Unit ...........................................................................16
Removing the Speakers ..............................................................................16
Removing the Smart Core Block .................................................................17
Section 4 - Exploded View/Part Number Information .................................18
KDL-55W900A .............................................................................................18
Smart Core Block.................................................................................................20
Connectors ..................................................................................................21
KDL-55W900A .....................................................................................................21
Smart Core Block.................................................................................................21
Screws .........................................................................................................22
Section 5 - Accesories/Part Number Information .......................................23
Accessories and Packaging ........................................................................23
Miscellaneous ..............................................................................................23
Optional Accessories ...................................................................................23
Remote Commander ...................................................................................23
Appendix A: Encryption Key Components ............................................... A-1
KDL-55W900A ii
CAUTION!!
These servicing instructions are for use by qualified 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 qualified to do so.
WARNING!!
An isolation transformer should be used during any service to avoid possible 
shock hazard, in case of live chassis. 
!
 
SAFETY-RELATED COMPONENT WARNING!!
There are critical components used in LCD color TVs that are important for 
safety. These components are identified with shading and 
!
 
mark on the 
schematic diagrams and the parts list. It is essential that these critical parts 
be replaced only with the part number specified in the parts list to prevent 
electric shock, fire 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 warranty.
ATTENTION!!
For safety reasons, component level repair of the Power Supply Boards 
and/or the Inverter Boards is prohibited. 
CAUTION ABOUT THE LITHIUM BATTERY!!
Replace only with the same or equivalent type. Danger of explosion may 
occur if battery is replaced incorrectly. Exposed battery should not be in 
contact with water.
CAUTIONS AND WARNINGS
ATTENTION!!
Ces instructions de service sont à l’usage du personnel de service qualifié 
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 
qualifié faire ainsi.
ALERTE!!
Afin d’eviter tout risque d’electrocution provenant d’un chássis sous tension, 
un transformateur d’isolement doit etre utilisé lors de tout dépannage. 
!
 ATTENTION AUX COMPOSANTS  
RELATIFS A LA SECURITE!!
Les  composants  identifies  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  identifies  dans  le  present  manuel.  Suivre  ces  procedures  lors  de 
chaque remplacement de composants critiques, ou lorsqu’un mauvais 
fonctionnement suspecte.
ATTENTION!!
Pour  des  raisons  de  sécurité,  Interdire  de  réparer  ou  remplacer  les 
composantes dans les blocs d’alimentation et/ou sur les modules d’inverseur. 
AVERTISSEMENT AU SUJET  
DE LA PILE AU LITHIUM!!
Ne  remplacez  qu’avec  une  pile  de  type  identique  ou  équivalent.  Danger 
d’explosion  si  la  pile  est  remplacée  incorrectement.  La  pile  exposée  ne 
devrait pas être mise en contact avec de l’eau.
KDL-55W900A iii
CAUTIONS AND WARNINGS
SAFETY CHECK-OUT
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 in “Leakage Test”.
LEAKAGE TEST
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.  
Follow the manufacturers’ instructions provided with the tester.
2.  A battery-operated AC milliammeter. 
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. Nearly all 
battery-operated digital multimeters that have a 2 VAC range are 
suitable. (see Figure A)
To Exposed Metal
Parts on Set
0.15 µF
Earth Ground
AC
Voltmeter
(0.75V)
Figure A. Use an AC voltmeter to check AC leakage.
HOW TO FIND A GOOD EARTH GROUND
The cover-plate retaining screw on most AC outlet boxes is at earth ground. 
Verify the AC outlet box retaining screw ground by connecting a 60W to 
100W incandescent (not a neon or fluorescent 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)
Figure B. Checking for earth ground.
Trouble Light
AC Outlet Box
Page of 28
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Here you can view online or download Sony KDL-55W900A Service Manual in pdf. This Service Manual can help you recover, restore, fix, disassemble and repair Sony KDL-55W900A TV. Information contained in Sony KDL-55W900A service manual (repair manual) typically includes:

  • Disassembly, troubleshooting, programming, maintenance, remote, adjustment, installation and setup instructions.
  • Schematics, wiring and block diagrams.
  • Printed wiring boards (PWB) and printed circuit boards (PCB).
  • Parts list (bill of materials).