Sony KV-28WF1A Manual de usuario

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KV-28WF1

DEST.COMMANDER CHASSIS NO.

MODEL MODEL

CHASSIS NO.

COMMANDER DEST.

RM-839

French

SCC-K01S-A

KV-28WF1K

KV-28WF1R

KV-28WF1U

SERVICE MANUAL

KV-28WF1A

KV-28WF1B

KV-28WF1D

KV-28WF1E

RM-839

Italian

SCC-K05Q-A

RM-839

AEP

SCC-K07T-A

RM-839

OIRT

SCC-K20H-A

RM-839

OIRT

SCC-K20G-A

BE-3D

CHASSIS

MICROFILM

TRINITRON COLORTV

RM-839

Spanish

SCC-K06S-A

RM-839

SCC-K04N-A

USEFUL INFO.

USEFUL INFO.USEFUL INFO.

USEFUL INFO.

Error reader.

The BE-3D chassis supports the use of the Error Reader. This jig, is available under part number S-188-900-10

(price code S).

The displayed code shows the actual error of the TV set. Refer to the service manual or the table below for an

explanation of those codes.

ERROR CODES

02 - Protection circuit trip <ANY TIME>

03 - IIC SCL LOW <POWER UP ONLY>

04 - IIC SDA LOW <POWER UP ONLY>

05 - IIC SDA and SCL LOW <POWER UP ONLY>

06 - Jungle/chroma controller no acknowledge <POWER UP ONLY>

07 - Video switch no acknowledge <POWER UP ONLY>

08 - Tuner no acknowledge

09 - MSP no acknowledge

10 - NVM no acknowledge

11 - M3L TXD LOW <POWER UP ONLY>

12 - M3L RXD LOW <POWER UP ONLY>

13 - M3L ENABLE LOW <POWER UP ONLY>

14 - M3L TXD AND RXD LOW <POWER UP ONLY>

15 - Compact Text test fail <POWER UP ONLY>

16 - AV switch cannot power on reset

17 - Cannot initialise jungle

18 - NVM acknowledge fail after initialisation

19 - Multiple devices with no acknowledge <POWER UP ONLY>

20 - Compact Text run-time failure

21 - AVSWITCH response failure after power up

22 - JUNGLE/CHROMA controller response failure after power up

23 - Compact Text does not respond

24 - Sound processor run time failure

25 - M3L bus clock low time-out after data sent (run time failure)

26 - M3L bus clock low time-out afetr data sent (power up)

27 - M3L bus clock low time-out afetr data sent (initialization)

28 - DSP run-time failure.

Replacement of HV transformer.

Two types of high voltage transformer are used (removable or fixed focus cable). When replacing a line

transformer, replace using the original type.

Type Focus cable Part no.

A Removable 1-453-169-12

B Fixed 1-453-220-11

DEFLECT

DEFLECTDEFLECT

DEFLECT

Lines tearing when hot.

[32in models only]. Replace line driver transformer T804.

No sync in TXT mode.

Replace IC1001.

PICTURE

PICTUREPICTURE

PICTURE



Horizontal interference in picture during first half hour.

IC606 is defective. Therefor unstable +9V (pin 3 of IC606). Replace 9V regulator IC606.

Ref. Description Location Part no.

IC606 LM2940T-90 D-board PSU 8-759-267-25

Visible arcing interference on screen when appliance does function. Intermittently switches off when switched

on.

Replace line output transformer T803.

Partially blanked horizontally.

Check zener diode D817 (RD5.6ESB2) in blanking circuit, for leaks.

Overbright, nearly negative picture.

Access service mode and enter TT07 to clear.

AUDIO

AUDIOAUDIO

AUDIO

Hum and/or buzz of the headphones and/or speaker when vol. is low.

Deflection unit generates interference. On board A, solder side, add a thick wire AWG18 200mm long between

pins 6,7 and 8 of IC203 and pins 29 and 30 of CN1. Given its critical position, the wire must be kept away from

board A.

Part no. Ref.

190090227 Wire AWG18

No sound. Headphones OK.

Fau;t 1: [PS6001 O/C]. Replace audio output chip IC1200 (TDA7264).

Distorted or loud crackling from audio.

Check audio demodulator/processor chip IC202 (MSP3410).

POW

POWPOW

POWER

ERER

EHT comes up briefly then nothing. No error code.

[Excess current protection system operating]. Check line output transformer T803.

Intermittently switches off when switched on. Visible arcing interference on screen when appliance does

function.

Replace line output transformer T803.

Locks when hot.

Replace IC202 (MSP3410).

Shuts down when hot.

Replace IC202 (MSP3410).

FUNCTION

FUNCTIONFUNCTION

FUNCTION

No TXT. No OSD.

Check zener diode D817 (5.1V) on main PCB.

Comes on then switches to standby. Standby LED flashes twice.

(1) Check field output chip IC500 (STV9379).

(2) [OK if D505 disconnected]. Check zener diode D505 (MTZJT7736A) for leaks.

(3) [No change if D505 disconnected]. Replace memory chip NVM IC2.



Does not got into standby mode completely; picture disappears but line continues to run.

(1) Check Q602, Q603 and Q604 in standby switching circuit. Check reservoir capacitor C615.

(2) [Above components replaced; HT not at 135V]. Replace error detector chip IC602 (SE135N).

Pulses in and out of standby. RY600 clicks each time.

Check Q601 (2SC3852A), D603 (6.8V) zener and R634 (22R) on primary side of PSU.

Degaussing incomplete.

Replace relay RY600 with part number 1-755-018-11.

TUNING/MEMORY

TUNING/MEMORYTUNING/MEMORY

TUNING/MEMORY

Intermittently channels change.

Replace tactile switches S9001 and S9002 on D board.

GEOMETRY

GEOMETRYGEOMETRY

GEOMETRY

E-W bowing. Excessive width.

Check R870 (1R/1W).

OTHER

OTHEROTHER

OTHER

No OSD. No TXT.

Check zener diode D817 (5.1V) on main PCB.

Intermittently volume bar appears.

Replace tactile switches S9001 and S9002 on D board.

Incomplete or messy OSD and menus. TXT OK.

Replace IC1001.



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