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Vizio M421VT LED TV fault

 
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Sun Apr 17, 2016 12:38 am    Post subject: Vizio M421VT LED TV fault Reply with quote


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Hi guys; i need your help on this Vizio M421VT LED TV, one of my last finds,and i'm trying to save it from going to landfill;
i have this screen pic attach.,
also there is no sound.

http://postimg.org/image/b1s2lk0zx/ae269042/
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Sun Apr 17, 2016 10:00 pm    Post subject: Reply with quote

Hi there anybody have a clue of this fault! it's as if the video is scrambled,voltages are good.
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AnalogRocks
Forum Moderator



Joined: 08 Mar 2006
Posts: 26026
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Sun Apr 17, 2016 11:52 pm    Post subject: Reply with quote

Can you post a picture of all the circuit boards inside the set?
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 23993
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Apr 18, 2016 5:09 am    Post subject: Reply with quote

I haven't worked on a lot of Vizios, but typically it's the main board that's gone bad. Doesn't look like a bad LCD screen or driver board to me. It's not worth doing.
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Mon Apr 18, 2016 5:07 pm    Post subject: Reply with quote

Curt Palme wrote:
I haven't worked on a lot of Vizios, but typically it's the main board that's gone bad. Doesn't look like a bad LCD screen or driver board to me. It's not worth doing.





Thanks curt Palme; i have made a Utube video,i've got hold of a remote control and was able to set chan-3 and i get sound and the scrambled pic.
sometimes when i plug from the wall it gets the vizio logo blinking then a few pugs in and out from the outlet i can get pic scrambled and sound,
well i would be happy if it was not the screen, no money now for a main board that is being sold for 130 dollars which is out of the question for now,maybe i come across a cheaper a board in the future




. https://youtu.be/YiSs0lPw6RY
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Mon Apr 18, 2016 9:26 pm    Post subject: Reply with quote

AnalogRocks wrote:
Can you post a picture of all the circuit boards inside the set?



Here are some pics thanks
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 23993
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Apr 18, 2016 10:07 pm    Post subject: Reply with quote

Vizios are known for bad motherboards. Note that even if you find a used motherboard for cheaper, it will most likely fail the same way again. Do a search on this forum for exactly that story on another Vizio. Guy replaced the power supply for $100, that wasn't it. Finally found a CPU/motherboard for $130. That fixed it, and 6 weeks later it died again, same problem.

Throw it away, it's not worth doing.
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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Mon Apr 18, 2016 11:34 pm    Post subject: Reply with quote

Curt Palme wrote:
Vizios are known for bad motherboards. Note that even if you find a used motherboard for cheaper, it will most likely fail the same way again. Do a search on this forum for exactly that story on another Vizio. Guy replaced the power supply for $100, that wasn't it. Finally found a CPU/motherboard for $130. That fixed it, and 6 weeks later it died again, same problem.

Throw it away, it's not worth doing.



Thanks i think i'm going to do that
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Curt Palme
CRT Tech



Joined: 08 Mar 2006
Posts: 23993
Location: Langley, BC

TV/Projector: All of them!


PostLink    Posted: Mon Apr 18, 2016 11:38 pm    Post subject: Reply with quote

Find some 2007-2009 LGs or Samsungs. A lot of those have bad power supply capacitors, and I call it my 12 minute fix. 8 minutes to take the back off and on, and 4 minutes to replace the bad caps. makes them as good as new!

Sonys over 42" have lots of screen problems, lines, rolling and weird colors, which are also throwaways.
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26026
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Tue Apr 19, 2016 2:40 am    Post subject: Reply with quote

If you are going to scrap it sell the stand on Ebay. Stand usually go for $30 - 40 bucks.

If you decide to fix it, try the main board on the right side in your picture first provided you can test the power supply to see if the voltages from the power supply are OK

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silv55




Joined: 26 Mar 2016
Posts: 50
Location: USA


PostLink    Posted: Tue Apr 19, 2016 11:53 pm    Post subject: Reply with quote

Thanks i've got tv running i did the BGA chip heating, i don't know for how long,
i applied the same method as the Ps3 YLOD fix tutorial just by heating first bottom side with low heat then with high heat the heat sink , let it cool for an hour then put it together and voila it's running for now,i also added 2 small 5 v fans connected to USB.



http://postimg.org/image/w8qemkslz/a87ababc/


http://postimg.org/image/juherh593/2a52fe32/
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AnalogRocks
Forum Moderator



Joined: 08 Mar 2006
Posts: 26026
Location: Toronto, Ontario, Canada

TV/Projector: Sony 1252Q, AMPRO 4000G


PostLink    Posted: Wed Apr 20, 2016 12:40 am    Post subject: Reply with quote

Cool! Er Hot! Nice fix. Very Happy
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