Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

[RollinDRE]

I'd love to repair my old Samsung UN55H7150 LED TV to pass it on to my grandma. Her vision is worsening, and this would be a nice upgrade over her 24" tube TV in her bedroom.

About a year ago, the TV would randomly loop the "Smart TV" startup logo. I'd power on the TV, and as the "Smart TV" logo would load, the TV would power off / on and this would repeat for a random extended period of time. This would last anywhere from a few minutes to 15+ minutes, until it would completely power on and continue to work fine until it was turned off. This issue lasted for a couple of months.

Eventually that stopped and it started to just load the "Smart TV" logo once and then the TV would go black. At that point the light at the bottom is red, and it won't react to any buttons being pressed, and won't power off until the unit is unplugged.

I'm a newbie, but I'm assuming that one of its' boards went bad. Anyone know which board is the culprit? Or suggestions on ways to diagnosis and confirm which one is causing the problem?

Here's a link to a video of what it's currently doing and photos of the boards.

Thanks for any suggestions and help,
Danny

[budm]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

We need pictures showing all the boards and how they are connected together, that will be a start.
Do you have DMM to make Voltage, resistance testing?

"Eventually that stopped and it started to just load the "Smart TV" logo once and then the TV would go black. At that point the light at the bottom is red, and it won't react to any buttons being pressed, and won't power off until the unit is unplugged." This info indicating there is problem with the main board.

[RollinDRE]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

We need pictures showing all the boards and how they are connected together, that will be a start.

Thanks for the reply. The link in the original post has a wide photo of the layout of the boards and then closeup photos of each board separately.

Do you have DMM to make Voltage, resistance testing?

Yes, my stepdad does. He'll be able to help me. I have a neuromuscular disability that causes limited mobility, but I should be able to guide him through it with some instructions. What did you have in mind?

"Eventually that stopped and it started to just load the "Smart TV" logo once and then the TV would go black. At that point the light at the bottom is red, and it won't react to any buttons being pressed, and won't power off until the unit is unplugged." This info indicating there is problem with the main board.

A couple of people in a Facebook group that I posted in thought the same. I'm hoping there's a way to confirm, or at least make it seem pretty sure it's the main board, prior to ordering a new one.

Thanks again!

[Davi.p]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

Open it, unplug the wifi dongle and retest, if the same unplug bluetooth module then retest.

[RollinDRE]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

Open it, unplug the wifi dongle and retest, if the same unplug bluetooth module then retest.

Those were the first things I tried upon opening it a several weeks ago, but I may try again. A few people have suggested it.

[Davi.p]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

If you have already tried my suggestion it's unuseful that you redo it..

[RollinDRE]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

Replaced the main board and it's working great. Thanks!

[budm]

Re: Samsung UN55H7150 LED TV - Powers on, loads SmartTV logo, then goes black

Thanks for the follow-up on the repair.