KV-XA29K90 - Sony TV Service Manual (repair manual). Page 4

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The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automati-
cally begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/
TIMER 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/TIMER 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

• +B overcurrent

(OCP) or
overvoltage
(OVP)

• Vertical

deflection
stopped

• Horizontal

deflection
overdrive

• White balance

failure (no
PICTURE)

• Micro reset

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.

• Power is shut down

shortly, after this return
back to normal.

• Detect Micro latch up.

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.

* R(Q703), G(Q702) or B(Q701) out is faulty (C6 board).

No. of times

STANDBY/TIMER

lamp flashes

Does not light

2 times

5 times

—

Self-diagnostic

display/Diagnostic

result

—

002:000 or

002:001~255
003:001~255
004:001~255

at the same time

005:000 or

005:001~225

101:00 or

101:001~225

Probable

Cause

Location

• Power cord is not plugged

in.

• Fuse is burned out F4601

(F)

• H.OUT Q511 is shorted.

(A board)

• Q701, Q702, Q703 is

shorted (C6 board)

• -13V is not supplied.

(A board)

• IC 503 faulty (A board)

• G2 is improperly adjusted.

(Note 2)

• CRT problem.
• R(Q703), G(Q702) or

B(Q701) out is faulty
(C6 board)

• IC301 is faulty. (A board)
• No connection A board to

C6 board.

• Discharge CRT (C6 Board)
• Static discharge
• External noise