Question about Vizio L32 32 in. LCD HDTV

3 Answers

Vizio l32 turns on makes noise then off again then over again

I have repaired several lcd tvs now and this is the first one i have seen do this.

when you plug it in the light (yellow maybe? green?) comes on for a second and then off, while this is happening there is a very high pitch squeal coming from the back that seems to increase in pitch, then when the light goes dark the sound goes away.
and then it starts all over again and continues until you unplug it.

i have cracked the case on it and looked through the power and control board . i only see one issue on the power supply, the large 450v 150pf cap is just barely extended, have not discharged the cap yet to see if it holds charge or not.
need help on this one, it is for a friend who is way down on their luck and really needs some good fortune

thanks in advance

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  • 2 more comments 
  • Jimmy Carter May 07, 2008

    it is not a crt, so no flyback in here, you have any info on the lcd tvs? thanks
    JCC

  • Jimmy Carter May 07, 2008

    and the cap is rated in picofarad, micro, thanks

  • m lost May 09, 2008

    I have the same problem but it only happens when you plug it in or turn it on and stops fo a second. the tv is 14 mounts old and it was a really big purchase for us. I dont know anything about tvs but am a handy person and can figure things out with help. Vizio wnats almost what a new one costs to repair it. Where should I start. Thanks

  • Jimmy Carter May 20, 2008

    ok, update,
    i replaced the large cap,
    and it just took an extra second to start squealing, so i am intending to replace the power board, it can be had for 75$ or less from vancebaldwin electronics.

    if yours is an l32, get the back cover off and get the part number from the power board (its the one with all the transformers and heat sinks) mine was 0469d03.
    then search on google, you'll find it.



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3 Answers

Great thanks for the info, i was wondering whether or not the transformer could be damaged. like i said the cap in question is ever so slightly bulged, no leaks or cracks / blast marks, so i am not toally convinced that it is the cap, but i guess it is worth the 4-5$ to find out. since i have to remove it to test it anyway.

i just wish it would stay powered up long enough to do some testing, and with the noise it is making i am very hesitant to stick my hands anywhere near it knowing that kind of voltage is being discharged.
even if the transformer is bad i have all the right size and type wire to re-wind it myself.

i do appreciate your words of caution, i have learned through the years how not to get shocked and i follow all those rules very carefully (got shocked by a flyback on a 36" crt a few years ago, never again) i will keep you guys posted on the situation. thanks again.

Posted on May 07, 2008

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Transformers on power supplys can make that high pitch noise... Did you say that Cap looks extended like Bulging at the top?
Well if your going to attempt this yourself which I feel you are please be careful I could sit here and type paragraphs on what to do but I feel you have enough knowledge to just read up on it.
Capacitors aren't hard to replace.. but... but... that cap could have damaged the transformer so its not converting enough AC to DC.

Good thing is you have ALOT to read before starting please
Bad thing is you might need a new power supply also.

Ok go here it has TONS of info on CAPS tips/tricks
http://www.justradios.com/captips.html

I have replaced so many electronic parts... sometimes I worry about sending people off to do it on their own. Please read all the relivent information on the site.

If you need more help like finding the correct CAP or using 2 Caps in parallel to get the correct pf amount let me know.

Posted on May 07, 2008

  • Ronald Tisdale
    Ronald Tisdale May 08, 2008

    Ok well goodluck and if what I said helps rate my solution Fixya please and if it was only Helpful in the fix feel free to rate it helpful.

  • Ronald Tisdale
    Ronald Tisdale May 08, 2008

    You can short a CAP with the end of a stripped wire... So just hold the insulation for a piece of scrap wire... and strip the end to expose some metal and close the circuit for the CAP.



    Yeah I can still feel the pain from my first CRT repair when I was 13... blasted me up to my elbow

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Take out the 450 v -150mfd cap and replace it, that is causing your problem.also check your flyback transformer it probably needs to be replace.check and see if high voltage is not escaping from the anode of your crt.

good luck

Posted on May 07, 2008

  • Henry  Thomas
    Henry Thomas May 07, 2008

    kindly send me your email address mine is nicodhem@yahoo.com you will need to change the whole power supply circuit. that high pitch is surely the sound of your caps.you can order such component HD ELECTRONICS,MONTGOMERY,CA,
    phone 323-265-1536

    good luck

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