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Vizio M65-C1 Powers ON, Blank Screen, Power LED Fades

I power the TV on and get bright power LED. Connected receiver turns on as usual (CEC working) then power LED fades to super dim. I opened the back up and haven’t seen any obvious signs of damage (blown caps, etc.) but I did find a “spare” screw laying on the main board down by the inputs.

I’m just looking for some ideas as to what to replace first. My thoughts are that the main board is the culprit but also the most expensive piece to replace. The fact that my receiver is still told to turn on and that I can power on the TV by pushing the home button on my Roku remote makes me think it’s not a power issue.

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I had this same issue with my vizio, I tried changing out the back lighting and the power board with no results except that when I could see (from the side looking with my eyes up to the screen) , it was very faint and upside down. I was told by a repairman if its out of warranty trash it! I did and got a LG. good luck. I hope someone knows this answer I do not.

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Turns out it was the main board. I ordered a new one ($150) and slapped it in. Powered right up. I will say, the back side of the faulty one looked like someone dumped baby food on it then tossed it in the oven. This TV had not been off it's initial setup place since I bought it, so nothing has happened to it since I've owned it.

To add a bit more clarity, the backlights were not turning on before this was replaced. The loose screw hanging out in there definitely helped make my decision on ordering a main board first. I initially thought it was the power board before tearing into it.

Be aware the main board for this TV comes in two flavors depending on the first part of your serial number.

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My TV is same model. It just went dark / black screen a week ago. I opened up and nothing seems defective from visual. I have sound but just black screen. Any idea what may be the problem. Thanks!

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I have the same issue with my Vizio M65-C1 as well. It powers up but the power led fades. no picture, no sound, no backlight. the baked on baby food substance may be thermal paste ? Mine had these pink eraser things underneath the main board had a similar looking substance. In any case, I used a blow dryer to try to reflow the main board and it still isn't working. I'm thinking I'd rather replace the main board for $150 than try to buy a new tv or pay someone else to repair it. @davezonk where did you order your main board from?

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@davezonk so it powers on and you can see the backlight turning on? You get no video and no audio? I'd be suspicious of this "spare screw" on the main board. It is entirely possible that it shortened out the main board. Start by measuring all the voltages going from the power board to the main board and see if these correspond with the values printed on the power board. Let us know what you find out.

Of course you can always post some good pictures of your boards etc., with your question so we can see what you see. 在已经存在的问题里加入图片

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