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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
SAMSUNG LCD LA40C530F1RXXA Backlight Turns off Randomly

 

 


kolbep
New User

Feb 21, 2019, 5:43 PM

Post #1 of 1 (69 views)
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SAMSUNG LCD LA40C530F1RXXA Backlight Turns off Randomly Can't Post

Hi
I have a Samsung LCD LA40C530F1RXXA Television.
It is several years old, and started turning off it's backlight by itself.

After being off for a while, the backlight stays on between 5 and 20 minutes, after which time it turns off.
Tuning on again, the backlight stays on for at most 30 seconds at a time.

When the Backlight is on, all the tubes look uniform brightness.
I have cleaned the PSU and the Inverter boards.

I put a DC Multimeter on the Diodes on the Inverter board, and they return 4.5v. Just before the backlight turns off, the voltage on each of those diodes go up to over 5.5v.

Also, I checked the 2 LD inputs on the Inverter board. They run about 9 volts, then fluctuate (I think they drop a bit low) once or twice before the backlight cuts off.

Any suggestions on where I can start looking to fix this problem. It was a free TV, so I will be happy if I can get it going.

Thanks
Peter
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