KV-VF21M40 - Sony TV Service Manual (repair manual). Page 5

– 5 –

• The units in this manual contain a self-diagnostic function.
• If an error occurs, the STANDBY lamp will automatically begin to flash.

The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY lamp
flash indicators is listed in the instruction manual for the user’s knowledge and reference.

• 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.

• When an errors occurs, the STANDBY lamp will flash a set number of times to indicate the possible cause of the problem.

If there is more than one error, the lamp will identify the first of the problem areas.

• Result for all of the following diagnostic items are displayed on screen. No error has occured if the screen displays a “0”.

Diagnostic

Item

Description

• Power does not

turn on

No. of times

STANDBY lamp

flashes

Does not light

Self-diagnostic

display/Diagnostic

result

—

Probable

Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out F901

Detected

Symptoms

• Power does not come on.
• No power is supplied to the

TV.

• AC power supply is faulty.

Note 1: If a + B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.

The symptom that is diagnosed first by the microcontroller is displayed on the screen.

Note 2: Refer to screen (G2) Adjustment in section 3-4 of this manual.

• FBT
• Q802 (H OUT) shorted

2 : 0 or
2 : 1
4 : 1

2 times

4 times

5 times

• Vertical deflection

stopped

• White balance

failure (no
PICTURE)

• +B overcurrent

(OCP) or
overvoltage
(OVP)

• Has entered standby state

after horizontal raster.

• Vertical deflection pulse is

stopped.

• Horizontal deflection

stopped.

• Power line is shorted or

power supply is stopped.

4 : 0

or

4 : 1

• IC501
• IC301 

!¢

 pin

• IC606
• Q802 (H OUT) shorted
• Q803
• Q608
• R803 open

5 : 0

or

5 : 1

• On standby state.
• Load on power line is

shorted
(at the same time 4 : 1 on

display).

at the same
time

(Note 1)

• CRT
• IC301
• IC701 - IC703, Q701

(CV board)

• G2 is improperly adjusted.

(Note 2)

• No raster is generated.
• CRT cathode current

detection reference pulse
output is small.

Code

Coutents

00h

NO EMG

10h

CAM encode NG during unloading

11h

CAM encode NG during unloading

12h

CAM encode NG at intial

20h

T reel NG during unloading

21h

S reel FG NG

22h

T reel FG NG

23h

S reel FG NG

24h

T reel FG NG at initial

25h

S reel FG NG at initial

Code

Coutents

30h

Capstan FG NG at initial

31h

Capstan FG NG

40h

Drum FG NG

41h

Drum FG NG at initial

42h

Drum FG NG

43h

Drum PG NG

44h

Drum PG NG

50h

DEW

60h

FL NG

70h

DEW eject NG

• VCR EMG code List