Samsung UN55HU7200 not powering on, no blink code

[dskall]

Re: Samsung UN55HU7200 not powering on, no blink code

So it stays in standby? Does pson need to be pulled low? Have you tried remote? Checked buttons to see if they change voltage?

[budm]

Re: Samsung UN55HU7200 not powering on, no blink code

First we need good clear pictures of the whole back side of the TV showing all the board.
What is the power supply board P/N? BN44-00781A??? This board is also known for bad solder joints, especially around the transformer legs that are fed through the through hole rivets.
What do you have for BL-ON (BLU_ON/OFF)?

[withalligators]

Hey folks,
Haven't had a project in a long time. Kinda rusty at diagnosing. Got the aforementioned Samsung off the side of the road. Screen appears uncracked and fine. Plugged it in, hear a relay click, red LED indicator comes on, stays on. Button presses do nothing.

Unfortunately, all my tools were stolen, all I have right now is a crappy $3 multimeter. Here's what I've done. I pulled the back, and tested the outputs from the power supply to the main. Both A5V show 5V in standby. All six B13V show 13V in standby. PS ON/OFF shows 3ishV. Nothing seems to change when the on button is pressed.

No obvious puffy caps or burnt components on main or power. Nothing causes the red LED to change

Soooooo, whaddya think? Seems like a main issue to me, but I'm rusty, like I said. I want it to be a power board issue, cause its cheaper, but I don't think it is. Tell me I'm wrong. If you guys think it'll help, I'll post pics.

Thanks!
Alex