Hi all,

I have a Samsung UE75TU7090 with PSU board BN44-01056A (L75S6N_THS) with a backlight fault. With both backlight connectors unplugged the TV boots normally with a stable 12V rail. With the backlight connected the TV fails to start, Channel 1 (rated 115V) folds back to around 20V, Channel 2 (rated 70V) drops to 0V, and the 12V rail collapses to 3.1V. With the backlight disconnected and powered on, Channel 2 ramps up to around 230V open circuit while Channel 1 sits at 0V.
Since the TV boots fine with the backlight unplugged I'm leaning towards a shorted LED strip causing...

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Hi, I have a Samsung GU65TU8079U, where the backlight is not working. I started with the typical Samsung test to disconnect the mainboard, still no backlight comes up.

Next I took out the PSU and took it to the bench. 13 V are there and also ~280 V on the LED connector (with nothing connected).
Now I am struggling with the connector pinout. On the component side of the PCB I find this label:


Also on the backside there is an identical pinout.



However that pinout does not make any sense looking at the traces. Pin 1 is the positive...

Post body:

Hi all,

I'm working on my Samsung QE65Q9FN (65" Q9FN QLED, European model) with relay clicking and no picture. The power supply board in the display itself is the BN44-00944A, known on the board itself as the 65A board (silk-screened designation). There is also a second board, the 65B, which looks identical but is only partly populated for the LED power.

Symptom: Continuous relay clicking on the one connect — TV will not start up, no picture. However the standby LED is on constantly — so the standby supply rail appears to be alive and the...

Hi everyone!

Hope you're all having a great day, and thank you very much for stopping by and taking the time to read this post to help me with my parents' Samsung TV.

My issue: No backlight.

Model: QE82Q70RAT
Type No: QE82Q70RAT

The TV was already serviced by Samsung once under warranty for the exact same issue, but six months after the fix, the backlight went out again. Now, Samsung is asking for nearly the same price as a brand new TV to fix this with the same 6-month guarantee.

So hopefully, I can fix this cheaper.
...