Self-Diagnostic Function - Sony KDF-42WE655 Service Manual

The units in this manual contain a self-diagnostic function. If an error occurs, the POWER/STANDBY or LAMP LED 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 or LAMP LED fl ash
indicators is listed in the instruction manual for the user's knowledge and reference. If an error symptom is diffi cult to reproduced use the Remote
Commander to display the record that is stored at the internal NVM to specify the cause of the failure.
Diagnostic Test Indicators
When an error occurs, the POWER/STANDBY or LAMP LED 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. If the errors occur simultaneously, the one that corresponds to the fewest
fl ashes is identifi ed fi rst.
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
Lamp cover error
Fan error
Temp error
Lamp driver error
Low B error
Audio error
D-OVP error
ATSC-OVP error
Lamp error
KDF-42WE655/50WE655

SELF-DIAGNOSTIC FUNCTION

Number of times
STANDBY or LAMP LED
lamp flashes
3 times - Lamp cover is not fastened securely
- Fan1-4 Power is not supplied.(G2 board)
4 times - Fan connector is not seated securely
- Fan caught wires or harnesses
- Internal temperature is too high
4 times - IIC-E line connector is not seated properly
(WE:H3 board, WF/XS:H4 board)
5 times - Lamp driver defect
6 times -No "DD 6V " output (G1 board)
- Short-circuit of Audio power supply line
(KD board, G1 board)
- Blowout of a fuse
7 times
(F4702,F4703,F4704 on KD board)
- IC failure
(IC4703,IC4708,IC4710 on KD board)
- Overvoltage of +3.3V or +2.5V
8 times
(A board, B board)
-No "DTL MODULE 5V " output
10 times
(G1 board, G2 board)
LAMP-LED is ON. - Lamp is dead
Probable Cause
KDF-42WE655/50WE655
Self Diagnosis
Supported model
Detected Symptoms
- 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
- No picture/No sound
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