Question about ViewSonic NextVision N3200w 32 in. HDTV-Ready LCD Television

1 Answer

Viewsonic n3250w LCD-TV

My TV seems to be looking for a signal and the screen is blank. The green power light is on and the unit makes a chirping sound. I have tried using all ports with different sources and nothing changes. Any way to reset the TV?

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  • John misak Jun 12, 2007

    I went to two shops that told me the price would be in the $500 range without even looking at the TV.

    How can I find a reputable shop, or, better, can I fix this myself? I have a working knowledge of electronics and circuitry.

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  • Master
  • 934 Answers

That chirp indicates a feedback on the secondary transformer in the switch mode power supply and needs to be either repaired or replaced. A good shop can have this one back up in an hour or so - assuming they have the parts on-hand... If they have to replace the SMPS you'll naturally have to wait a few days. Most shops don't have such specific parts on-hand and will have to order it.. Replaced an entire SMPS for an Akai recently with the same symptom, chirping. Turned-out to be the regulators and two MOSFET's. A MOSFET is a metal oxide semiconductor field effect transistor.. In laymen's terms a switching gate. But below the two MOSFET's, when they went thermal they burned the board and several small traces which could not be bridged. The SMPS was $70.00 plus shipping, and you're probably going to be somewhere in that ballpark on this too if the whole SMPS has to be replaced. Good Luck Bill

Posted on Jun 08, 2007

  • William Rayburn
    William Rayburn Jun 12, 2007

    To find a reputable shop I would recommend the NESDA site: http://www.nesda.com/locator/state_searc...
    That should point you in the right direction with that part of your question.
    Second, a working knowledge is great but it won't substitute for the tools you'll need. At a minimum you would need a DMM, ESR meter and 20Mhz scope. You may also need a signal generator and logic probe. So, repairing this yourself is not probably possible unless you do what we call in the industry a shotgun repair. That type of repair would most likely be $500.00 or more...
    That said, if you have the right stuff to remove the back and remove the SMPS yourself you could send it in to PTS Electronics and have it overhauled. You might try calling them and see what they would charge to make the repairs to the power supply. Have the model number of the unit handy.
    PTS can be reached at: 800-844-7871
    Good Luck
    Bill

    PS: If you need anything else I can help with drop me an email at: premtech@willapabay.org and reference enough in your email that will bring me up to speed with this particular problem.. I get about 600 emails a day so whatever you can do to refernece will be appreciated.

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