Vizio M3D460SR no picture

[MillzB5]

Picked up this TV from a buddy 1 month out of warranty.

When you initially plug it in, the Vizio symbol blinks twice, pauses, then blinks continuously until you hold the power button. It then goes solid (dim, but solid).

After a 10 count you can turn the TV on. It has no picture, but there is a backlight. I dont know what input it's on so I haven't been able to figure out if sound will still come out.

From a quick google search, I've seen that the issue could be the power supply, but I don't want to dump money into it without knowing a single thing about it yet. I can't find any bad capacitors on any of the boards, so just seeing if anyone else has experienced this TV and could point me in the right direction.

[budm]

Re: Vizio M3D460SR no picture

Do you get user setup menu? If inot, check and see if you do get either 5V or 12V at both ends of the SMD fuse on the T-CON board.
Any good clear pcitures of YOUR boards?

[MillzB5]

Re: Vizio M3D460SR no picture

I'll take some pictures and test the fuse tonight as soon as I get home. Thanks for the response, I'd rather not blindly buy a power board and end up having to buy something else.

[MillzB5]

Re: Vizio M3D460SR no picture

Alright so I finally got around to taking some pictures.

Had a death in the family so I was a little delayed in my repairs.

Anyway, here are the pictures:
T-Con board

Power Board

Inverter board?? Not sure on this one

Main board


I don't see the fuse you're referring to on the t-con board.

[MillzB5]

Re: Vizio M3D460SR no picture

Also forgot to add, I cannot see any menus or anything.

I've tried unplugging it, discharging everything by holding the power button 30 seconds, the plug back in, still the same results.

Vizio logo flashes until I hold the power button. Then the logo goes solid (but dim, to indicate it is off). I then press the power button and just get a backlit black screen, no picture just blank.

When I did a google image of the SMD fuse you mentioned, I didnt see one on the T-Con board, but it could just be my ignorance. I'm used to just replacing capacitors and the TV working again, haven't had to get this deep in testing before.

[budm]

Re: Vizio M3D460SR no picture

Need better pictures, cannot see much to what the components labels are, look for something like F1 on the T-CON board.

[MillzB5]

Re: Vizio M3D460SR no picture

I found what looks like what you're referring to labeled F101, would this be the fuse I need to test?

Also, am I testing this with the TV on?

[tom66]

Re: Vizio M3D460SR no picture

Probably, without clear pictures hard to tell.

[MillzB5]

Re: Vizio M3D460SR no picture

Sorry, alls I've got is my cell phone and the camera blows on it. Let me see if I can borrow something to take a decent picture from my mom.

[MillzB5]

Re: Vizio M3D460SR no picture

Heres the "f101" piece I was referring to

[tom66]

Re: Vizio M3D460SR no picture

Definitely a fuse. With the TV switched on, measure the voltage on both ends: red probe on each end, black probe on the chassis.

[Jerseysax]

Re: Vizio M3D460SR no picture

I'm having the same issue with this same model. The Vizio light will come on bright when powered up using the side button or remote, and go dim when powered down. Complete black screen. I don't see any sign of of backlighting at all. I dont know about sound, it's silent now, but I had the speaker muted because I was using an external Vizio soundbar. I also seem to have good link lights on the embedded ethernet adaptor. A red led coming from the opitical sound port in the back. Now this may sound like a stupid question, but is the below board shot, and would it cause the issues I'm having in the manner I'm describing?
LED Driver Board:
The part with the dark shade around it is labeled Q852:


Thank you in advance for any advice.

[MillzB5]

Re: Vizio M3D460SR no picture

So as a shot in the dark, I bought a power board and slapped it in. Worked for about 10 seconds, the display had a bunch of lines and grainy picture, then stopped working again. I'd imagine I've either fried the power board again or blown the small white fuse out.

Any ideas?

[Cosmo66]

Re: Vizio M3D460SR no picture

This sounds like a problem with the main board. I have a Vizio VT470M with identical symptoms. I've already ruled out the power supply and tcon board. The inverters work fine also, I get backlight when the TV is powered up, but there is no picture or sound.

Unfortunately, the main boards are quite difficult to troubleshoot and expensive to replace, $100 is the cheapest I can find

[MillzB5]

Re: Vizio M3D460SR no picture

That's what I figured. Chased this problem before on a plasma TV. Luckily the place I got the power supply from has offered to send me a new one just incase.

[FPayne4362]

It's a bad tcon board. Vizio has had a lot of issues with them

Bad tcon 100 percent positive if u can find




QUOTE=MillzB5;335892]Alright so I finally got around to taking some pictures.

Had a death in the family so I was a little delayed in my repairs.

Anyway, here are the pictures:
T-Con board

Power Board

Inverter board?? Not sure on this one

Main board


I don't see the fuse you're referring to on the t-con board.[/QUOTE]

[Glitcher]

Re: Vizio M3D460SR no picture

Just got this model in the other day, no picture, turned out to be a bad tcon board. it worked fine initially once plugged in but as it heats up, the picture starts flickering until itll go out. And also the tcon board let out an annoying whine.

The Tcon board is 46T12.C01. Its pretty hard to find for the m3d460sr model but I was able to buy the Seiki version (less than $15) and swap over the parts from the bad m3d460sr tcon to exactly match it and get it working.