Self-Diagnostic Function - Sony KF-42WE620 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the POWER/STANDBY will automatically begin to fl ash. The number of
times the LED fl ashes translates to a probable source of the problem. A defi nition of the POWER/STANDBY fl ash 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.
Diagnostic Test Indicators
When an error occurs, the POWER/STANDBY will fl ash a set number of times to indicate the possible cause of the problem. If there is more than one
error, the LED will identify the fi rst 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".
Diagnostic Item
Description
Power does not turn on
Lamp cover error
Fan stopped
Temp error
Lamp driver error
+B OVP error
Audio error
D-OVP error
Lamp error
KF-42WE620/50WE620

SELF-DIAGNOSTIC FUNCTION

No. of times
POWER/STANDBY Probable Cause Location
lamp flashes
• Power cord is not plugged in.
0
• Fuse is burned out.
(F1901 on F Board)
• Lamp cover is not attached
3 times
securely.
• Fan1, Fan2, or Fan 3 power
4 times
is not supplied. .
(A Board)
• Fan connector is not attached
securely
• Temperature is high.
4 times
• IIC-E line connector
(CN8023 on A Board,
CN44 on H Board) is not
attached securely.
• Lamp driver is faulty.
5 times
• +17V is not supplied.
6 times
(G1 Board)
• Audio line is shorted.
7 times
(A, G1 Board)
• IC8504 (A Board) or IC4704
(AU Board) is faulty.
• PS1601 or 1602 is opened.
(G1 Board)
• +3.3V or +2.5V or 1.8V is
8 times
over voltage.
(G3 Board)
• Lamp for the light source has
LAMP-LED flashes
burnt out.
KF-42WE620/50WE620
Self Diagnosis
Supported model
Detected Symptoms
• Power does not come
on.
• No power is supplied
to the unit.
• AC power supply is
faulty.
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
• No picture/No sound
7