Sony KDL-32R420A Schematic

HISTORY INFORMATION FOR THE FOLLOWING MANUAL:

SERVICE MANUAL

ORIGINAL MANUAL ISSUE DATE: 3/2013

Version Date Subject

1.0 3/2013 Original manual issue.

1.1 10/2013 Correction of Panel Selection in Service mode. (P.19)

RB1FKCHASSIS

Segment: BA

LCD Digital Color TV

9-888-532-02

SERVICE MANUAL

LCD Digital Color TV

RB1FKCHASSIS

Segment: BA

9-888-532-02

MODEL LIST

MODEL COLOR COMMANDER DEST.

KDL-32R420A Black RM-ED054 AEP KDL-32R421A Black RM-ED054 AEP KDL-32R423A Black RM-ED054 AEP/UK KDL-32R424A Black RM-ED054 AEP

KDL-40R470A Black RM-ED054 AEP KDL-40R471A Black RM-ED054 AEP KDL-40R473A Black RM-ED054 AEP/UK KDL-40R474A Black RM-ED054 AEP

KDL-46R470A Black RM-ED054 AEP KDL-46R473A Black RM-ED054 AEP/UK

MODEL COLOR COMMANDER DEST.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

WARNINGS AND CAUTION S - ENGLISH

CAUTION

These servicing instructions are for use by qualified service personnel only. To reduce the ri sk o f ele ct ri c sho c k, d o not perfo r m a ny se rvi ci ng other than that c o nta ine d i n the op e ra ti ng instr uc tio ns unless you are qualified to do so.

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.

CARRYING THE TV

Be sure to follow these guidelines to protect your prop e r ty and avoid causing serious injury.

• Carry the TV with an adequate number of people; larger size TVs require two or more people.

• Correct hand placement while carrying the TV is very important for safety and to avoid damages.

SAFETY-RELATED COMPONENT WARNING!!

Components identified 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 identified in this manual. Follow these procedures whenever critical components are replaced or improper operation is suspected.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

WARNINGS AND CAUTION S - FRENCH

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.

WARNING!!

Afi n d’eviter tout risque d’electrocution provenant d’un chássis sous tension, un transformateur d’isolement d oit etre utilisé lors de tout dépannage. Le chássis de ce récep teur est directement raccordé à l’alimentation du secteur.

POUR TRANSPORTER LE TÉLÉVISEUR

Tenez compte de ce qui suit pendant l’installation du téléviseur :

• Débranchez tous les câbles avant de transporter le téléviseur.

• Transportez le téléviseur avec le nombre de personnes approp r ié ; un téléviseur de grande taille doit être transporté par au moins deux per so nnes .

• Lors du transport du téléviseur, l’emplacement des mains est très important pour votre sécurité, ainsi que pour éviter de causer des dommages.

ALERTE!!

Afi n d’eviter tout risque d’electrocution provenant d’un chassis sous tension, un transformateur d’isolement d oit etre utilise lors de tout depannage. Le chassis de ce recep teur est directement raccorde a 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 e s dans le present manuel. Suivre ces procedures lors de chaque remplacement de composants cri tiques, ou lorsqu’un mauvais fonct ionnement suspe cte.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

USE CAUTION WHEN HANDLING T HE LCD PANEL

When repa ir ing the LCD p a nel, b e sure you ar e gro und ed b y using a wrist b and . When repa ir ing the LCD p a nel o n the wall, the LCD panel must b e secur ed usi ng t he 4 mounting ho l es o n the r ea r c o ver .

1) Do not press on the panel or frame edge to avoid the risk of electric shock.

2) Do not scratch or press on the panel with any sharp objects.

3) Do not leave the module in high temperatures or in areas of high humidity for an extended period of t ime.

4) Do not expose the LCD panel to direct sunlight.

5) Avoid contact with water. It may c ause a short circuit within the module.

6) Disconnect the AC power when replacing the backlight (CCFL) or inverter circuit. (High voltage occurs at the inverter circuit at 650Vrms.)

7) Always clean the LCD panel with a soft cloth material.

8) Use care when handling the wires or connectors of the inverter circuit. Damaging the wires may cause a short.

9) Protect the panel from ESD to avoid damaging the electronic circuit (C-MOS).

10) It is recommended not to exceed 1 hour of Power-On nor Burn-in period with LCD panel face down condition, in repair activity.

WARNINGS AND C AUT IO NS

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

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 o r 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. B e absolutely certain that you have replaced all the insulators.

4. Look for unauthorized replacement parts, parti c ularly transistors, that were installed during a previous repair . Point them out to the customer and recommend their replacement.

5. Look for par ts which, though functioning, show obvio us signs o f d et er io r at io n. P o i nt them out to the custo mer 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.

8. For safety reasons, repairing the Power board and/or Inv ert er board is prohibited.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

Leakage Test

The AC leakage from any exposed metal part to earth ground and from all exposed m etal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microamperes). Leakage current can be m easured by any one of three m ethod s.

1. A commercial leakag e tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instructions.

2. A battery-operated AC milliampm ete r. The Data Precision 245 digital m ultim eter is suitable fo r this job.

3. Measuring the voltage d rop across a resistor by means of a VOM or battery-operated AC voltmeter. The “limit” indication is 0.75 V, so analog meters must hav e an accurate low voltage scale. The Simpson’s 250 and Sanwa SH-63TRD are examples of passive VO Ms that are suita bl e. Nearly all battery-operated dig ital multim eters 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).

SAFETY CHECK-OUT

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

SELF DIAGNOSIS FUNCTION

STBY LED

F lash time

Service men u Item

name

(Screen Displ ay)

D iagn ostic Item D escript ion

2 MAIN_POWER Detect power boar d 12V. ( V_DROP_DET )

TUNER_ERR Detect TS signal Error.

AUDIO_PROT Det ec t A udio Amp Error .

DC_ALERT1 Detect +3. 3V+5V Drop. (V_DROP _DE T)

BALANCER_ERR Not used

TCON_ERR Not used

PANEL_POWE Not used 6 BACKLIGHT_ERR Detec t panel backlight r eady. 7

TEMP_ERR Not used 8 - Not used 9 - Not used

10 - Not used 11 - Not used 12 - Not used

3 5

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED will automatically b egin to flash. The number of times the LED flashes translates to a probable source of the problem. A definition of the STANDBY LED flash indicators is listed in the instruction manual for the user’s knowledge and r eference. If an error symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.

DIAGNOSTIC TEST INDICATORS

When an error occurs, the STANDBY LED will flash a set number of times to indicate the possible cause of the problem.

If there is more than one error, the LED will identify the first of the problem areas. Result for all of the following diagnostic items are displayed on screen. If the screen displays a “0”, no error has occurred .

DISPLAY OF STANDBY LED FLASH COUNT

SELF-DIAGNOSTIC SCREEN DISPLAY

For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confirmed, it is possible to bring up past occurrences of failure for confirmation on the screen:

[To Bring Up Screen Test]

In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

[SELF DIAGNOSTIC SCREEN DISPL AY]

SELF DIAGNOSIS FUNCTION

Item name

BACK << 002 MAIN_POWER 000 003 TUNER_ERR 000 003 AUDIO_PROT 000 003 DC_ALERT1 000

SELF CHECK

STBY LED flash time

004 BALANCER_ERR 000

Error count

005 TCON_ERR 000 005 PANEL_POWE 000 006 BACKLIGHT_ERR 000 007 TEMP_ERR 000

12345-67891-23456 [Home] Exit

Panel operation time by hour Boot count Total operation time by hour

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen. After you have completed the repairs, clear the result display to “0”.

Clearing the Self Check Diagnostic List

1. Error history and Error count : Press the Channel 8 => Channel 0 .

2. Panel operation time : Press the Channel 7 => Channel 0 .

Exiting the Self-diagnostic screen

To exit the Self Diagnostic screen, turn off the power to the TV by pressing the POWER button on the remote or the POWER button on the TV.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

SEC 1. DISASSEMBLY AND PARTS LIST

• Items with no part number and no description are not stocked because they are seldom required for roution service.

• The construction parts of an assembled part are indicated with a collation number in the remark co lum.

• Items marked " * " are not stocked since they are seldom required for routine service. Some delay should be anticipated when ordering these items.

Note: About the wire dressing, please refer to “APPENDIX-1”. Note: About the tape position, please refer to “APPENDIX-2”. Note: About the procedure of switch unit disassembly method, please refer to “APPENDIX-3”.

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

REF. No . PART No . DESCRIPTION MARK

1 4-446-634-01 STAND SHAFT (M2) 2 4-459-441-51 COV E R, UNDER (32F ANF ) for KDL-32R423A(UK )

4-459-441-61 COVER, UNDE R ( 32 FANF) for KDL- 32R420A/421A/

423A(A E P ) /424A

2-580-608-11 SCREW, +PSW M5X16 2-580-639-01 SCREW, +BV T P 4X12 TYPE2 IT-3 7-685-647-79 SCREW +BVT P 3X10 TYPE2 IT-3

1-1. KDL-32R420A/421A/423A/424A

1-1-1. STAND SHAFT

DISASSEMBLY AND PARTS LIST

1-1-2. COVER, UNDER

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

REF. No . PART No . DESCRIPTION MARK

3 1-492-329-21 SWITCH UNIT 4 1-910-108-04 FFC CABLE 32 MB-KEY 6P 5 1-858-888-21 LOUD SPEAKER (R) 40X100MM 6 1-474-486-11 GL3(ID)-STATIC CONVERTER(TV) 7 1-910-107-98 CONNECTOR ASSY 32 MB-SP LR 4P 8 1-846-662-11 POWER-SUPPLY CORD for KDL-32R420A/421A

/423A(AEP) /424A

1-846-663-11 POWER-SUPPLY CORD for K DL- 32R423A(UK )

9 1-910-108-02 FFC CABLE 32 MB- T CON 30P 10 1-910-108-03 FFC CABLE 32 MB- IR 10P 11 1-910-107-97 CONNECTOR A SSY 32 MB-PSU 14P 12 1-895-375-11 MOUNTED PWB A for K DL- 32R420A/ 421A

1-895-375-21 M O UNTED PWB A for K DL- 32R423A(AEP) /424A

1-895-375-31 M O UNTED PWB A for K DL- 32R423A(UK) 13 1-858-888-11 LOUD SPEA KER (L) 40X100MM 14 A-1939-532-A LCM ASSY (32FANFY MR) EU for K DL- 32R420A/ 423A

A-1939-533-A LCM ASSY (32FANFY HL) EU for K DL- 32R421A/ 424A 15 4-459-475-21 BRACKET, V ESA (FANF) 16 1-910-107-99 G ROUND CABLE 32 MB-PSU (M )

7-685-646-79 SCREW +BVT P 3X8 TYPE2 IT -3

1-1. KDL-32R420A/421A/423A/424A

1-1-3. GL3 BOARD, A BOARD, SPEAKER AND VESA BRACKET

DISASSEMBLY AND PARTS LIST

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

1-2. KDL-40R470A/471A/473A/474A

REF. No . PART No . DESCRIPTION MARK

1 4-446-635-01 STAND SHAFT (ML2) 2 4-459-446-51 COV E R, UNDER (40F ANF ) for KDL-40R473(UK )

4-459-446-61 COVER, UNDE R ( 40FA NF) for K DL- 40R470A/ 471A

/473(AEP ) /474A

2-580-608-11 SCREW, +PSW M 5X16

2-580-639-01 SCREW, +BV T P 4X12 TYPE2 IT-3

7-685-647-79 SCREW +BVT P 3X10 TYPE2 IT-3

1-2-1. STAND SHAFT

DISASSEMBLY AND PARTS LIST

1-2-2. COVER, UNDER

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

REF. No . PART No . DESCRIPTION MARK

3 1-910-108-12 FFC CABLE 40 MB-KEY 6P 4 1-492-329-21 SWITCH UNIT 5 1-474-487-11 GL4(CH)-STAT I C CONV ERTER (TV) 6 1-858-888-21 LOUD SPEAKER (R) 40X100MM 7 1-910-108-06 CONNECTOR ASSY 40 MB-SP LR 4P 8 1-846-662-11 POWER-SUPPLY CORD for K DL- 40R470A/ 471A

/473A(AEP) /474A

1-846-663-11 POWER-SUPPLY CORD for K DL- 40R473A(UK )

9 1-910-108-10 FFC CABLE 40 MB- T CON 51P 10 1-910-108-05 CONNECTOR A SSY 40 MB-PSU 14P 11 1-910-108-11 FFC CABLE 40 MB- IR 10P 12 1-895-375-41 MOUNTED PWB A for K DL- 40R470A/ 471A

1-895-375-51 M O UNTED PWB A for K DL- 40R473A(AEP) /474A

1-895-375-61 M O UNTED PWB A for K DL- 40R473A(UK) 13 1-858-888-11 LOUD SPEA KER (L) 40X100MM 14 A-1939-535-A LCM ASSY (40FANFY MR) EU f or K DL- 40R470A/ 473A

A-1939-536-A LCM ASSY (40FANFY HL) EU for KDL-40R471A/474A 15 4-459-475-21 BRACKET, V ESA (FANF)

7-685-646-79 SCREW, +BV T P 3X8 TYPE2 IT -3

2-580-639-01 SCREW, +BV T P 4X12 TYPE2 IT-3

1-2. KDL-40R470A/471A/473A/474A

1-2-3. GL4 BOARD, A BOARD AND SPEAKER

DISASSEMBLY AND PARTS LIST

1-2-4. VESA BRACKET

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

REF. No . PART No . DESCRIPTION MARK

1 4-446-636-01 STAND SHAFT (L2) 2 4-459-473-51 COV E R, UNDER (46F ANF ) for KDL- 46R473A(UK )

4-459-473-61 COVER, UNDE R ( 46FA NF) for K DL- 46R470A/ 473A(AEP )

2-580-608-11 SCREW, +PSW M 5X16

2-580-639-01 SCREW, +BV T P 4X12 TYPE2 IT-3

7-685-647-79 SCREW +BVT P 3X10 TYPE2 IT-3

1-3. KDL-46R470A/473A

1-3-1. STAND SHAFT

1-3-2. COVER, UNDER

DISASSEMBLY AND PARTS LIST

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

REF. No . PART No . DESCRIPTION MARK

3 1-492-329-21 SWITCH UNIT 4 1-910-108-20 FFC CABLE 46 MB-KEY 6P 5 1-474-488-11 GL5(CH)-STAT I C CONV ERTER (TV) 6 1-858-888-21 LOUD SPEAKER (R) 40X100MM 7 1-910-108-14 CONNECTOR ASSY 46 MB-SP LR 4P 8 1-846-662-11 POWER-SUPPLY CORD for K DL- 46R470A/ 473A(AEP)

1-846-663-11 POWER-SUPPLY CORD for K DL-46R473A(UK )

9 1-910-108-18 FFC CABLE 46 MB- TCON 51P 10 1-910-108-19 FFC CABLE 46 MB- IR 10P 11 1-910-108-13 CONNECTOR A SSY 46 MB-PSU 14P 12 1-895-375-41 MOUNTED PWB A for K DL- 40R470A

1-895-375-51 M O UNTED PWB A for K DL- 46R473A(AEP)

1-895-375-61 M O UNTED PWB A for K DL- 46R473A(UK) 13 1-858-888-11 LOUD SPEA KER (L) 40X100MM 14 A-1939-537-A LCM ASSY (46FANFY MR) EU for KDL- 46R470A/473A 15 4-459-475-31 BRACKET, V ESA (FANF)

7-685-646-79 SCREW, +BV T P 3X8 TYPE2 IT -3

4-465-806-01 GEAR SCREW M 3X5 22

2-580-639-01 SCREW, +BV T P 4X12 TYPE2 IT-3

7-685-647-79 SCREW +BVT P 3X10 TYPE2 IT-3

1-3. KDL-46R470A/473A

1-3-3. GL5 BOARD, A BOARD AND SPEAKER

DISASSEMBLY AND PARTS LIST

1-3-4. VESA BRACKET

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

1-4. OTHER PART

PART No . DESCRIPTION MARK

1-492-067-11 REMOTE CO MMANDER (RM-E D054) 4-458-514-11 MA NUAL, INSTRUCTION GB 4-458-514-21 MA NUAL, INSTRUCTION FR/ES/NL/DE/PT 4-458-514-31 MA NUAL, INSTRUCTION NO/FI/DK/SE 4-458-514-41 MA NUAL, INSTRUCTION PL/HU/CZ/SK/RO/BG/GR/IT 4-458-514-91 MA NUAL, INSTRUCTION RU/UA

4-459-474-21 BRACKET, VESA T O P LO NG A (46FAN) for wall mount (46inch only) 2-580-602-01 SCREW, +PSW M4X12 (V ESA L FA N) for wall mount (46inc h only)

1-4-1. MISCELLANEOUS

DISASSEMBLY AND PARTS LIST

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

SEC 2. ADJUSTMENT

HOW TO ENTERING SERVICE MODE

1) Turn on the main power switch to place this set in standby mode.

2) Press the buttons on the remote commander as follows, and entering servi ce mode.

3) Service mode display.

Info TV POWERChannel Volume

Service Mode

Status Information >> Self diagnosis history >> Panel Selection <[ 19_S320DB3-1_EU ]> NO_SIGNAL_MUTE <[ Off ]> TUNING SYSTEM <[ AUTO ]> LVDS Spectrum (%o) <[ 30 ]> Low of HPD <[ 5 ]> UART Selection <[ Usb Fact ]> SERIAL NUMBER EDID 6000001 MODEL NAME EDID KDL-32R420A

[</>]Set[Home]Exit

Panel Selection MODEL NAME EDID

19_S320DB3-1_EU KDL-32R420A

KDL-32R421A KDL-32R423A KDL-32R424A

18_S400DH1-1_EU KDL-40R470A

KDL-40R471A KDL-40R473A KDL-40R474A

48_S460DH1-1_EU KDL-46R470A

KDL-46R473A

- When replace Main Board or panel, please confirm "Panel Selection" and "MODEL NAME EDID" in service mode. If they are different, please select a suitable thing.

- Change of SERIAL NUMBER EDID and MODEL NAME EDID are possible only once when they are white character.

Note: About the software data update, please refer to “APPENDIX-4”.

KDL-32R420A/421A/423A/424A, 40R470A/471A/473A/474A, 46R470A/473A(AEP/UK)

4) How to use the remote commander.

Function The flow of control

Service mode on <Info><5><Vol Up><Power> Service mode off <Other> / <Power off + on>

Adjustment Item up / down /

Data Value up / down /

5) After entering service mode, then turn off the power switch.

ADJUSTMENT

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

SEC 3. TROUBLE SHOOTING

3-1. NO POWER

No power

Long AC off(> 15 min.)

and then

Power On

Check SB_3.3V

at 1 pin of CN201

on the Main board

Between 3.14~3.45V

Enter Service Mode and check

Self diagnosis history

Check the harne ss

PSU to M/B

connection

IF MAIN_POWER > 0 or

DC_ALERT1 > 0

IF AUDIO_PROT > 0

BACKLIGHT_ERR > 0

Replace the harness

between PSU and

Main board

Symptom improvement

Change

PSU

Yes

Change

Main board

Change

Main board

Change

Panel

Change

Main board

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

Fix the harness

connection

Harness issue

3-2. STANDBY LED BLINK

1) 2 times blinking (Main Power Error)

2-time blinking

TROUBLE SHOOTING

Check REG+12V at

CN201_Pin-3/8 on

Main board

(11.8~13.2V)

Change

Main board

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

Check PSU_EN# at

CN201_Pin-6 on

Main board

<2.6V

Change

Main board

>=2.6V

Check the harne ss

PSU to M/B

connection

Fix the harness

connection

Replace the harness

between PSU and

Main board

Symptom

improvement

Harness issue

Change

PSU

2) 3 times blinking (Main Board Error)

3-time blinking

Check PWM_5V at

L202 pin-2 on Main board

(4.75~5.25V)

TROUBLE SHOOTING

DC_ALERT

U202, L202, etc

Change Main board

Check SYS_3.3V

at U204_Pin-6 on Main Board

U204, etc

Change Main board

(3.135~3.465V)

Check the harne ss

M/B to Speaker

connection

Check the speaker

Impedance at the

SP Connector

(8ohm+/-15%)

Fix the harness

connection

KDL-32R420A/421A/423A/424A , 40R470A/471A/473A/ 474A, 46R470A/473A(A EP/UK)

AUDIO

Change Speaker

Demo, Audio, Tuner, etc

Change Main board

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