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I have a vizio jv50p. The tv turns on but won't display a picture for me. I need to know what the common problem is for this particular symptom. I can order what-ever part it needs. I know it's a common issue with the set and need some input on what is the common failing component in this set. Please do not reply for assistance if you haven't repaired these before. I will just ignore the comment and move to the next tech with the answer. Thanks.

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I'm pretty sure its the bad capacitors on the power supply board. They will look like this :

I have a vizio jv50p. - 1a89667.jpg

A good cap is totally flat on the top.

Anyways, many of these vizio TVs had bad caps from the factory and they took about 2 years to fail. If you read the values off the side of them and replace them with the exact same values (example 1000uf @ 25volt) then it should work good again.
You can purchase higher voltage caps, but make sure you get the 105 degree versions, and keep the uF rating the same.
Use a company like www.mouser.com, www.mcmelectronics.com, or www.jameco.com to get your caps, and you'll need a soldering iron, desoldering wick, and some solder to complete the job.

You can also complain to vizio and they might help you out. In my experience, they just send out a tech with another power board, same "potentially bad" caps on the new board.

Let me know how I can be of further assitance to you.

Posted on Jun 06, 2010

  • 5 more comments 
  • thielectronick
    thielectronick Jun 06, 2010

    oh, the power board is the one in the middle
    the power from the wall (AC power) goes straight into it and wires go to all the other boards.

    If the caps look good, I can talk you through narrowing it down to whichever board it may be, but I'm almost positive this one had some bad caps. If you see other "same value" caps that aren't bulged, replace those too. Only some values were defective, but you can assume any value that is bulged will go bad, even if other ones look good.


  • Steve Yelmene
    Steve Yelmene Jun 06, 2010

    I see nothing to that effect. The owner told me that the set made a sizzling noise before it went out.

  • thielectronick
    thielectronick Jun 06, 2010

    ok, if the caps are good, then you are typically narrowing down if you have a Y-sustain failure or Z-sustain failure. If you have the power LED, power is likely ok. If its turning on, the microprocessor is responding to your command and kick it on, so your main board is likely ok.

    at this point, you need a mulitmeter to check the fuses on the Y or Z board.
    the power board powers these boards with a Vs and Va voltages, which are about 200 and 60 volts respectively.
    if one of these voltages does not come up, you can isolate which board is shorted or "pulling down" the power supply by unloading the voltage cables.
    **important - this tv has a switch mode power supply (smps) that needs a load to work, if you unload both the Y and Z boards it will blow up the power supply because there will be no load. some will have the power cables going to both boards independently, others will have them "daisy chained" and you can really only unload one of them.
    anyways, you likely have a bad y or z board.
    this tv has multiple plasma panel manufacturers, usually lg but sometimes it will be a samsung
    on the lg, the part #s are listed on the boards

    from the back of the tv. the Y board is the one on the left with all the little buffer chips driving the rows of the picture (lots of wires) and the Z board is the one on the right with the large copper ribbons (2-3 big fat wires) that just sustain the panel.

    let me know where i can be of assistance.


  • Steve Yelmene
    Steve Yelmene Jun 06, 2010

    Yes, LG is the manufacturer. Is there something I can test to isolate which board is the problem?

  • thielectronick
    thielectronick Jun 06, 2010

    yes
    use an ohm meter and monitor Vs to cold ground
    if its low ohms, you have a short. unplug the cables and see which board has the "low ohm" condition
    if its high ohms, try the same check on the Va line, but thats more rare
    typically there are fuses on each board, check those with an ohm meter, whichever has a blown fuse is likely your bad board.
    if its the Y sustain, make sure all the buffer ICs look ok, the little chips that run the horizontal rows of the picture, if one has a pin hole burned into it, it will blow out your new Y sustain board if you don't replace both parts together.


  • Steve Yelmene
    Steve Yelmene Jun 06, 2010

    Do you possibly have a service manual for the tv? Or, do you know where I can get one. I would like to get one for free.

  • thielectronick
    thielectronick Jun 07, 2010

    contact vizio
    877.698.4946



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ecollier2012.jpg
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