Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

[bobsapp]

Hi all,

Samsung TV UE49KS7090 (2016).
No power, no red light. When I unplug the mainboard from the power board, HALF the backlights flash briefly. I made a short video here https://youtu.be/EVikW32p6kQ

Voltage measurements:
With mainboard DISCONNECTED, I see all voltages to be ca. 5-7V
With mainboard CONNECTED I See voltages of ca, 4-6V
According to the pinout diagram, I should be seeing 13V.

Would anybody know which part is faulty? Everywhere I read, it is expected that when you disconnect the mainboard, the backlights stay on permanently. But this is not the case with me. I'm suspecting the backlights (which of course are the hardest to repair IMO).

Thanks a lot for any support.

[bobsapp]

Re: Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

BUMP :-)
does anyone know which component needs replaced if,m when I unplug the mainboard from the power supply, it results in briefly flashing LED, like in the video?

[Davi.p]

Re: Samsung UE49KS7090 (2016) TV - no power, no red light - which part is faulty?

test PSB with some loads..