Vizio m550nv

[ShadyJay]

Hello,

I Received this TV from a family member that had it for maybe 2-3 years. From what I was told, the TV would periodically go to a black screen, or shut off as they would say. But, from what I have read about the TV automatically doing app and firmware updates, that it sounds like they may have mistaken updates to the set for shut downs.

Either way, the set now has nothing but a black screen when turned on... The logo will alternate between orange and white for maybe 30 secs, (warming up the backlight?) then stay solid orange. After that, hitting the power button again causes the logo to change to solid white. Unfortunately, that's it. No VIZIO logo on screen, the power dial on the side brings up no menu prompts.

I have tried all the inputs, as well as cycling through inputs with the remote. I have also unplugged for a hard reset, as well as unplugging, and holding the power dial in for 30 secs. (Which I read was another way to do the reset?) I don't have any testing equipment, and I'm not sure if I would know what I was doing even with instruction....

NOW, on the other hand. I don't have any issue at all when it comes to installing a new board if needed. From what I have been reading a lot of times it sounded like replacing the power supply board fixed the issue. A couple of posts though had said a new T-con board did the trick.

I have contacted a seller in advance about exchanging one board for another if the first one I tried just by guessing didn't work... I know it's not the smartest way to go, but for what this set can do, I feel like it is worth a couple hundred bucks at most to fix. I know it is not much to go on, but maybe even an educated guess could help.

Thanks in advance though to anyone that tries.

[Agent24]

Re: Vizio m550nv

Bit hard to say what it might be, would help if you can check voltages from PSU etc...

Someone else might know what board the symptoms point to but if not and without some kind of troubleshooting you would just be replacing boards at random basically..

[budm]

Re: Vizio m550nv

First, you need to provide good clear pictures of the whole back side of the TV, and the boards.
You will need to check the Voltages and signals on the power supply board to see what is missing.

[ShadyJay]

Re: Vizio m550nv

OK, so I know I may be asking quite a bit from someone to try and guess based on what I have presented so far. So... I'm thinking I WILL go ahead and pick up a tester and maybe someone from here could walk me through what to do?

I have been building PC's for about 10 years now so I'm not completely unfamiliar with hardware like this, as far as testing voltages though, the only part I have ever used a meter on was when I replaced the laser module on my old Xbox lol...

Anyways though, I'm sure if someone explained where I needed to test ect, I should be able to follow any instructions that are given. Thanks again to any help provided.

[ShadyJay]

Re: Vizio m550nv

Ah, thanks for replying Agent and Bud. Looks like you replied right before me heh. When it comes to what meter I buy, is there anything in particular I should make sure it tests for? I think the best one they have here at the local Walmart is only like 30$. Plus I think it has alot of auto functions that might help someone like me?

I will go ahead and start getting some pics together, I will hopefully have everything together here in a few hours. I will still keep an eye out here in case you mention anything else I might need.

Thanks again.

[Agent24]

Re: Vizio m550nv

For basic tests just about any meter will be fine. As long as it can do DC and AC Volts (with a 500v AC or higher range in case you need to measure on the primary side of the PSU), resistance\ohms, and has a diode\continuity test - which 99% of them do.

A $30 one from Walmart will likely be just fine. It won't be as good as a Fluke or anything but it will work.

Just avoid the really cheap ones, they can be a bit of a safety liability...