KF-42WE620, KF-50WE620 - Sony TV Service Manual (repair manual). Page 7

*If a +B overcurrent is detected, stoppage of the vertical defl ection is detected simultaneously.  The symptom that is diagnosed fi rst by the 
mircrocontroller is displayed on the screen.

- One blink is not used for self-diagnosis.

- Example
Diagnosis item

LED blinks

Lamp cover

3 times

Fan

4 times

LED ON : 0.3sec
LED OFF : 0.3sec

LED OFF

3.0sec

Stopping the POWER/STANDBY LED Flash
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the POWER/STANDBY lamp from fl ashing.

Self-Diagnostic Screen Display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” that cannot be confi rmed, it is possible to bring up past 
occurrences of failure on the screen for confi rmation.

To Bring Up Screen Test
In standby mode, press the buttons on the Remote Commander sequentially, in rapid succession, as shown below:

Display  

  Channel  5      

 Sound Volume  -  

 Power ON

Self Diagnosis

SELF DIAGNOSIS

6 : +B OVP

0

1 : LAMP

0

7 : AUDIO

0

3 : LAMP COVER

0

8 : D-OVP

1

4

: FAN

1

101 : WDT

0

Move the joystick

4 : TEMP

0

5 : LAMP DRIVER

0

201 : WDT-ENGINE

0

- Numeral "1" means a fault was detected one time or more.
- Numeral "0" means that no fault was detected.

MAIN

LCD ENGINE

Handling of Self-Diagnostic Screen Display
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you 
have completed the repairs, clear the result display to “0”.
Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.