Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

[Fellow]

Sharp TV LC-42LB261U

Wouldn't turn on when plugged in. No LED indicator either. Thought for sure this would be a PSB problem.

Replaced the PSB the first time and thought it was just a bad unit. Returned. Ordered new PSB. Plugged this one in and still the power button does not a thing when touched.

Puzzling... And I'm a TV repair noob, so I request guidance from the elder gods. I have a volt meter and a soldering kit.

Could this somehow be a problem with the actual cord connecting the PSB to the button board?
Could this be a main board problem somehow?
Waddup wit dat?

Edit:
Oh, I also checked the DC voltage out from the PSB.
The schematic on the board said:
15. 5v 16. 5v
12v 12v
12v 12v
12v_A 12v_A
GND GND
GND GND

And sticking the pins in each one of them I only got a few that read 15v. Is that normal?

[Alastair E]

Re: Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

Prolly a Mainboard fault.

[Maklaud]

Re: Sharp TV LC-42LB261U- Doozey! No LED from power after the PSB has been replaced

Hello.
Can you use service manual?