Vizio M421Vt faulty

Discussion in 'General Electronics Chat' started by frank55, Apr 16, 2016.

  1. frank55

    Thread Starter Member

    Dec 6, 2013
    253
    10
    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,
    also there is no sound.

    http://postimg.org/image/b1s2lk0zx/ae269042/
     
  2. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
    156
    The best answer for you is too google the model with the problem cause most times these are common issues and will give you the best solution .. Also look for repair kits too..
     
  3. SLK001

    Well-Known Member

    Nov 29, 2011
    824
    229
    My first guess would be a bad T-con board, but since you also have no audio, probably a bad main board. Also, you will probably get better recommendations at badcap forum.
     
  4. frank55

    Thread Starter Member

    Dec 6, 2013
    253
    10
    Thanks guys.
     
  5. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
    1,190
    156
    Have you checked the voltages and does any of the caps look bad ??
     
  6. Roderick Young

    Member

    Feb 22, 2015
    408
    168
    Is that from trying to use the tuner? Does it have a bad picture when you first start it up, no signal applied? Will it display a good picture with HDMI or other digital input?
     
  7. frank55

    Thread Starter Member

    Dec 6, 2013
    253
    10
  8. frank55

    Thread Starter Member

    Dec 6, 2013
    253
    10
    Hi guys;Update on this Vizio M-421VT Led display, 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




    .
     
  9. frank55

    Thread Starter Member

    Dec 6, 2013
    253
    10
    Hi guys;Update on Vizio, i've got it 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 opened a big hole behind the Main board Heat sink and added 2 small 5 v fans connected to USB.



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


    http://postimg.org/image/juherh593/2a52fe32/
     
  10. SLK001

    Well-Known Member

    Nov 29, 2011
    824
    229
    If it gives your more problems, you might consider removing the BGA chip and reballing it with 63/37 balls. That lead-free crap will be the death of us yet. The new "lead free" solder requires too much of a temp for the more fragile components on the board, so manufacturers are cheating on the low side of temp, thus there are a huge amount of cold solder joints out there. Good enough to last for a few months, but fail in the long term.
     
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