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Getting no picture or backlight with sound Samsung UN55H800AF

Thanks in advance for the help.

Model is: UN55H8000AF

When powered on I have no picture or backlight. I do have sound though. I have checked the fuse on the T-Con board (circled in red), and it is getting continuity, and roughly 12V. Also, all three LEDS stay solid blue. I have not replaced any parts. I am at a total diagnostic loss on what else to do to figure out the problem.

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Any advice would be greatly appreciated!

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Hi,

With the TV on with sound, try shining a torch (flashlight) at an angle close to the screen and check for images. They will be very faint so trying this in a darkened room may help to see them if they're there.

If they are there it is a backlight problem.

Turn off the TV and disconnect the power from the TV, remove the back cover and then disconnect the cable between the power board and the mainboard at the power board end.

Reconnect the power to the TV and turn it on.

The TV backlights should turn on full and stay on. Obviously there will be no picture because the mainboard is disconnected

If they don't turn on then either the backlight LEDs or the power board is the problem.

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Hello Jayeff,

Thanks for your reply. I did the first issue beforehand and must of forgot to add that troubleshooting to my original post.

For the second test, the power board connects to the mainboard AND the T-CON board with the same connection, will the results be the same?

I did try anyway and I got ZERO lighting of any sort anywhere.

Thanks again!

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@krayzed

Can't see it too well, but maybe check the voltage on pin 14 (BL on/off?) of CN803 on the power board with the cable on and then removed.

I think that this is the Backlight on/off signal wire.

You could always get a backlight tester (example only) but I'm thinking since there are no images or backlights it is the mainboard

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