Self Diagnostic Function - Sony KV-XA25M80 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the STANBY/TIMER 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 STANBY/
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.
1. DIAGNOSTIC TEST INDICATORS
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 No. of times
Item STANDBY/TIMER
Description lamp flashes
• Power does not Does not light
turn on
• +B overcurrent 2 times
(OCP) or
overvoltage
(OVP)
• Vertical
deflection
stopped
• Horizontal
deflection
overdrive
• White balance 5 times
failure
(no PICTURE)
• Micro reset
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).

SELF DIAGNOSTIC FUNCTION

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
– 5 –
KV-XA25M80/XA25M83/XA25N90
RM-954
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.
RM-914