KV-29SE10B - Sony TV Service Manual (repair manual). Page 6

BX-1L chassis TV’s contain a self diagnosis function. In the event of an error occurring, the STANDBY LED indicator will automatically begin
to flash. The number of times the STANDBY LED indicator flashes translates to a probable source of the problem. 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 error occurs, the STANDBY indicator will flash a set number of times to indicate the possible cause of the problem. If there is more
than one error, the indicator will identify the first of the problem areas.

The result for all of the following diagnosis items are displayed on screen. No error has occured if the screen displays a “0”.

*

If a+B overcurrent is detected, then the vertical deflection is detected simultaneously. The symptom that is diagnosed first by the micro
controller is displayed on the screen.

**

Refer to Screen (G2) Adjustment on page 19.

V

Lamp OFF 3 sec 

Lamp ON 300ms

Lamp OFF 300ms

Diagnostic Item

Flash Count

+B Overcurrent

2 flashes

V-Protect

4 flashes

IK (AKB)

5 flashes

HV Protect

8 flashes

* One flash count is not used for self-diagnosis.

Diagnosis

Item

Description

Power does
not turn on

+B overcurrent
(OCP)*

V-Protect

IK (AKB)

HV Protect

No. of timer

STANDBY (

1)

indicator flashes

Does not light

2 times

4 times

5 times

8 times

Self-Diagnostic

display/

Diagnosis result

–

2:0

or

2:1 ~ 255

4:0

or

4:1 ~ 255

5:0

or

5:1 ~ 255

8:0

or

8:1 ~ 255

Probable Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out (F4601)

A board.

• H OUT (Q511) is shorted.

(A board)

• IC751 is shorted. (C board)

• +13V is not supplied.

(A board)

• IC503 is faulty. (A board)

• Video OUT (IC751) is

faulty. (C board)

• IC001 is faulty. (A board)
• Screen (G2) is improperly

adjusted.**

• IC604 faulty.
• IC602 faulty.

Detected

Symptoms

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

TV.

• AC Power supply is faulty.

• Power does not come on.
• Load on power line is

shorted.

• Has entered standby state

after horizontal raster.

• Vertical deflection pulse is

stopped.

• Power line is shorted or

power supply is shorted.

• No raster is generated.
• CRT Cathode current

detection reference pulse
output is small.

• No power supply to CRT

ANODE.

• No RASTER is generated.