KF-E42A10, KF-E50A10 (serv.man5) - Sony TV Service Manual (repair manual). Page 7

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”.)

Panel/Lamp

Temperature

 2 times

- No picture/No sound

- Panel or Lamp temperature is too high.
- Temp sensor connector is 
  not attached securely.
  (CN7020 on HB Board, 
   CN7180 on S2 Board)

- Check ventilation

Lamp 

Cover/Position

3 times

- No picture/No sound

- Lamp is not inserted correctly (T2 board)
- Lamp cover is not closed (T1 board)
- Detection switch on the
  T1 board or T2 board is damaged

- Re-insert the Lamp
- Re-close the cover
- Change the board

Fan stopped

4 times

- No picture/No sound

- Fan (1-4) power is not rotating.
- Fan connector is not attached securely.
  Fan wires or harnesses caught.

- Clean fan to remove dust, 
  check Fan Regs on AGA Board
- Check connector CN8002 
  on AGA Board

Lamp driver

5 times

- No picture/No sound - HV regulator (Lamp driver) is not working

- Check B_12V output from 
   GTA Board
- Check the thermal fuse 
  near the lamp

Low B error

6 times

- No picture/No sound

- Low B (B_12V) is not supplied 
  (GTA Board) 

- Check AU_VCC from GTA Board
- Check the connection from the 
  AGA Board or GTA Board

Speaker Protection

Audio Error

7 times

- No picture/No sound

- K Board not working
  Fuse blown out 
   (PS3001 on K board)
  IC failure 
   (IC3005 on K board)
- K Board not connected
  Short-circuit of Audio power supply line

- Check AU_VCC from GTA Board
- Check the connection from the 
  AGA Board or GTA Board

D-OVP

8 times

- No picture/No sound

- Low B (B_12V) is over 15V
  (GTA Board) 

- Check B_12V output from 
   GTA Board

Lamp error

LAMP-LED is ON. - No picture/No sound - Lamp for the light source is burned out.

-Replace the lamp