Self Diagnostic Function - Sony TRINITRON KV-SW21M80 Service Manual

The units in this manual contain a self diagnostic 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.
1. DIAGNOSTIC TEST INDICATORS
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 occurred if the screen displays a "0".
Diagnosis No. of timer
Item STANDBY (1)
Description indicator flashes
No Power Does not light
+B overcurrent
(OCP)
V-Protect (OVP)
IK (AKB)
Power supply
NG (+5V) for
Video Processor
2. STANDBY INDICATOR BLINKING PROCESS
Lamp ON 300ms
Lamp OFF 300ms
Lamp OFF 3 seconds
The example above represents for 4 times blink

SELF DIAGNOSTIC FUNCTION

Diagnostic Result
on screen display
–
2 times 2:0
or
2:1 ~ 255
4 times 4:000
or
4:1 ~ 255
5 times 5:0
or
5:1 ~ 255
8 times 8:0
or
8:1 ~ 255
Probable Cause
Location
• Power cord is not plugged
in.
• Fuse is burned out (F600)
A board.
• H OUT (Q805) is shorted.
(A board)
• IC751 is shorted. (C board)
• +13V is not supplied.
(A board)
• IC804 is faulty. (A board)
• Video OUT (IC1545) is
faulty. (A board)
• IC001 is faulty. (A board)
• Screen (G2) is improperly
adjusted.
• IC604 faulty.
• IC602 faulty.
3. STANDBY INDICATOR ON TV FRONT PANEL
– 3 –
Detected
Symptoms
• Power does not turn on.
• No power is supplied on
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 shorted.
• No raster is generated.
• CRT Cathode current
detection reference pulse
output is small.
• No power supply to CRT
ANODE.
• No RASTER is generated.
Standby indicator
KV-SW21M80
RM-GA002