Question about Vizio P4 46 in. HD-Ready Plasma Television

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My 50" Vizio plasma tv has no power.

My Vizio just turned off! Is there a quick fix? Nothing. No lights come on at all, not even the back up yellow light? If someone can direct me on how to fix this or what parts I need, I would greatly appreciate the help.

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  • louhun May 24, 2009

    I have an lg and have the smae problem just turned its self off and now have no power chenged the fuse but still nothing

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Mine did a similar thing (VP322), I would go to turn it back on after it having been off for a while, and it would turn on, then off, then on... Over time it would cycle on and off even longer... Eventually it stopped working, would not turn on and made a clicking sound.

Mine was past it's warrenty, so I opened it up and inspected the switchmode power supply board (where AC connects, and two voltage ribbon cables going to screen circuit and main circuit). On the side going to the main circuit board I noticed that five electrolytic capacitors were bulging at the top (a clear sign of overheating) and when this happens, their values (in farads) tends to drop, which can cause voltage instibilities.

The capacitor values were:

2 x 25V 1000 uF
2 x 10V 3300 uF
1 x 10V 1000 uF

I replaced them with spares and reassembled the unit, and it now works.

Hope that helps!

Posted on Sep 03, 2009

  • HDrider48 Oct 04, 2010

    How do you get the back off the tv to access these capacitors?

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I tried a quick fix for this on-off-on-then-just-off problem on my dead VP322 and it works. Since the VP322 stayed on after it warmed up and would switch on and off normally then, I reasoned when it wouldn't start to just heat it up. I put a small space heater in the cabinet behind the TV and let it go. Fifteen minutes later the orange logo came back on, I hit the remote ON and voila it started up and ran normally. I've done this six days now until I can take it apart and replace something (like the capacitors). If you don't have a cabinet behind the TV try a hair dryer on the back but be aware it takes upwards of 10-20 minutes to warm up enough to turn on, (Incidentally this sounds to me like a cold solder joint but I'll know more when I take it apart and investigate.)

Posted on Mar 28, 2010

  • John P. Cater Apr 07, 2010

    Okay, rkrupski96 you RULE! Tried your fix on my VP322 exactly as you said and it works! $10 in parts and an hour of time. What a fix. Many many thanx.

  • John P. Cater Apr 07, 2010

    Oh, if you don't easily see the capacitors at fault, on my LG power board they were:



    C204 1000uf 25V

    C205 1000uf 25V

    C233 3300uf 10V

    C234 3300uf 10V

    C236 1000uf 10V



    The voltage on the replacements doesn't really matter as long as it's the same or greater than these values (and the replacement part fits). I replaced the 1000uf 10V cap with a bigger 25V one but then had to hot glue it to the surrounding parts to keep it physically stable. I'm still amazed that this fixed the problem (I'm an EE and it seems like this might have been a design problem ---or feature ;-).

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Check the fuse on the power supply if blown then get new one (cheapest way). If not change the power supply. Make sure you check your power source to make sure it has power. breaker may have tripped. Just a thought.

Posted on Jun 16, 2009

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