KV-21XE42C - Sony TV Service Manual (repair manual). Page 5

Diagnostic Item

 Flash Count*

+B overcurrent    2 times
Vertical deflection stopped   4 times
White balance failure    5 times

* One flash count is not used for self-diagnostic.

Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp from flashing.

For errors with symptoms such as "power sometimes shuts off" or "screen sometimes goes out" that cannot be confirmed, it is pos sible to bring up
past occurances of failure for confirmation on the screen:

[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

 Screen display  

 channel  5

 Sound volume  –

 Power ON

                                                                               

                                                                              Note that this differs from entering the service mode (sound volume 

 +  ).

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.

[Clearing the result display]
To clear the result display to "0", press buttons on the remote commander sequentially as shown below when the diagnostic screen is being
displayed.

Channel  8

 ENTER

To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.

SELF DIAGNOSTIC

2: 0  <-------------

Numeral "0" means that no fault has been detected.

3: N/A 0
4: 0
5: 1   <-------------

Numeral "1" means a fault has been detected one time only.

101: N/A 0

STANDBY/SLEEP lamp

Lamp ON 0.3 sec.

Lamp OFF 0.3 sec.

Lamp OFF

3 sec.

2 times

4 times

5 times