I have a Samsung model code: UN46H5203AFXZA; Version Number: TD01; Serial Number: 02PZ3CBF601719Y. I've tried different power sources and unplugging all external devices, but the standby light is flashing about every 2-3 seconds, and the screen is black with a white flashing light at the top. Any ideas? I greatly appreciate you're help. Thanks.
Sounds like your backlights are bad, can you see a faint picture with the flashlight test
Testimonial: "I tried the flashlight test and there was no picture. It’s almost like the tv is shutting on and off. I thought maybe it was the cord or outlet, so I changed outlets. I don’t have another cord, but after reading some other post, they said it may be the main board has gone bad. Any idea how to test that theory?"
Thanks Larry.
Test the power cord to be sure your getting voltage to the female end as the first test, if that's ok test the 5 volt standby on the power board, if you don't have that you need a new power board, if you have 5 volts there look for the BL_ON terminal on the power board, you need to see 3+ volts there, that's the signal from the main telling the backlight driver in the power board to turn on, if you don't see that you won't have backlights so the main need's to be replaced, if you see that voltage then the main is ok and a few more tests need to be done to figure out what's going on.
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