KV-XR29M80 - Sony TV Service Manual (repair manual). Page 3

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The units in this manual contain a self diagnosis function. If an error occurs, the STANDBY (1) indicator will automatically
begin to flash. The number of times the   STANDBY (1) 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 errors occurs, the STANDBY/(1) 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.

Result for all of the following diagnosis items are displayed on screen. No error has occured if the screen displays a "0".

Diagnosis

Item

Description

• Power does not

turn on

• +B overcurrent

(OCP)*

• I-Port

• IK (AKB)

• HV Protect

Detected

Symptoms

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

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 stopped.

• No raster is generated.
• CRT cathode current

detection reference pulse
output is small.

• No power supply to CRT

ANODE.

• No RASTER is generated.

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 2-4 of this manual.

No. of times

STANDBY/TIMER

lamp flashes

Does not light

2 times

4 times

5 times

8 times

Self-diagnostic

display/Diagnosis

result

—

2:0

2:1 ~ 255

4:0

4:1 ~ 255

5:0

5:1 ~ 255

8:0

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/CV Board)

• +13V is not supplied.

(A Board)

• IC503 voltage list is faulty.

(A Board)

• Video OUT (IC751) is faulty.

(C Board)

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

adjusted.

• IC604 faulty.
• IC607 faulty.