Self-Diagnostic Function - Sony KF-E42A10 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 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 will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the POWER/STANDBY 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".)
Number of times
Diagnostic Item
STANDBY lamp
Description
flashes
Panel/Lamp
2 times
Temperature
Lamp
3 times
Cover/Position
Fan stopped 4 times
Lamp driver 5 times
Low B error 6 times
Speaker Protection
7 times
Audio Error
D-OVP 8 times
Lamp error LAMP-LED is ON. - No picture/No sound - Lamp for the light source is burned out.
KF-E42A10/E50A10

SELF-DIAGNOSTIC FUNCTION

Detected Symptoms
- Panel or Lamp temperature is too high.
- Temp sensor connector is
- No picture/No sound not attached securely.
(CN7020 on HB Board,
CN7180 on S2 Board)
- Lamp is not inserted correctly (T2 board)
- Lamp cover is not closed (T1 board)
- No picture/No sound
- Detection switch on the
T1 board or T2 board is damaged
- Fan (1-4) power is not rotating.
- No picture/No sound - Fan connector is not attached securely.
Fan wires or harnesses caught.
- No picture/No sound - HV regulator (Lamp driver) is not working
- Low B (B_12V) is not supplied
- No picture/No sound
(GTA Board)
- K Board not working
Fuse blown out
(PS3001 on K board)
- No picture/No sound IC failure
(IC3005 on K board)
- K Board not connected
Short-circuit of Audio power supply line
- Low B (B_12V) is over 15V
- No picture/No sound
(GTA Board)
Self Diagnosis
Probable Cause
KF-E42A10/E50A10
Supported model
Possible Solution
- Check ventilation
- Re-insert the Lamp
- Re-close the cover
- Change the board
- Clean fan to remove dust,
check Fan Regs on AGA Board
- Check connector CN8002
on AGA Board
- Check B_12V output from
GTA Board
- Check the thermal fuse
near the lamp
- Check AU_VCC from GTA Board
- Check the connection from the
AGA Board or GTA Board
- Check AU_VCC from GTA Board
- Check the connection from the
AGA Board or GTA Board
- Check B_12V output from
GTA Board
-Replace the lamp
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