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panasonic tx-L42D25B

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t1412:
Hi fella's got a panasonic TX-L42D25B 7 blink error code, it's saying mainboard, any other info would be great thanks

shaun

fix2003:
note found on web
Panasonic TXL42D25 Error 7
This one was not to difficult to diagnose but i thought i would share the info as it was interesting.

This LED back light TV would attempt to switch on with a brief flash of back light then the TV would shut down and give error code 7

the manual states error 7 is A or XW Board

My first thoughts were power supply but i removed the outputs to the LED's and the set ran with no back light sound etc
was fine.

as this was under warranty i did not investigate the panel any further but i assume one of the LED sections were O/C

This is my first LED back light failure and is one to look out for.

Anyone else had this kind of problem?
replacement screen cured the fault.

downunder:

Very interesting, fix2003. A check of the service manual says that code 7 ia a Sub_3.3V_Sense_SOS, which would generally mean the Main (A Board). Granted the error codes are not always gospel but it would be easy enough for a person of Shaun's ability to test your solution.
Go Shaun the sheep - I'd be interested to know your findings.                  Bruce

t1412:
Hi vince/brucie the screen does flash up for a second then off, starts flashing 7 error blink code thanks 

shaun
 

t1412:
massive thanks for the tech tip the backlight is the fault,

shaun
 

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