KV-29FA240 - Sony TV Service Manual (repair manual). Page 6

 

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

*If a +B overcurrent is detected, stoppage of the vertical deflection is detected simultaneously.  The symptom that is diagnosed first by the mircrocontroller 

is displayed on the screen.

**Refer to Screen (G2) Adjustments in Section 2-4. of this manual.

Standby indicator

The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED indicator will automatically begin 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 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 error occurs, the STANDBY LED 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.

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

Diagnosis

Item

Description

• No Power

• +B overcurrent

(OCP)

• Vertical NG.

• IK (AKB)

• Supply Voltage

Protection

Detected

Symptoms

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

TV.

• AC power supply is faulty.

• Power does not turn 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 stopped.

• No raster is generated.
• CRT cathode current

detection reference pulse
output is small.

• No power supply to CRT

ANODE.

• No RASTER is generated.

No. of times

STANDBY

Indicator flashes

Does not light

2 times

4 times

5 times

8 times

Diagnostic Result

on screen display

—

2 OCP:0

2 OCP:1 ~ 255

4 VSTOP:0

4 VSTOP:1 ~ 255

5 AKB:0

5 AKB:1 ~ 255

8 SUP:0

8 SUP:1 ~ 255

Probable

Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out (F4101)

(H2 Board)

• H.OUT (Q511) is shorted.

(A board)

• IC751 is shorted.

(CV Board)

• +13V is not supplied.

(A Board)

• IC503 voltage list is faulty.

(A Board)

• Video OUT (IC751) is faulty.

(CV Board)

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

adjusted.

• IC604 faulty.
• IC607 faulty.