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Hi, I have a VizioSZ470XVT1a troubleshooting the backlight issue how do I know if the mother or slave back light inverter board is out they both test with no shorts I could use your help.

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  • radvanced Oct 04, 2010

    When I turn on the tv the backlight comes on for about 2 seconds then goes off I have audio and everything else works.I checked the voltage out put and they read what they are supposed too.So I unplugged the slave back light inverter and left the master plugged in and turned it on and the backlights blink with just the master plugged in.I dont think the lights are burned out because it blinks its only a year old tv.



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If they are testing as having no shorts it's probably likely they are fine. Is one of the backlights having issues? Just will not light up or what is the issue exactly?


Posted on Oct 04, 2010

  • Tim Grayson
    Tim Grayson Oct 04, 2010

    Have you looked into the warranty on this tv? It could be the mainboard sending irregular instructions to the backlight boards... I have seen this happen before and it's nearly impossible to test without replacing the mainboard. If it's just a year old though I would hate to have you need to replace parts... Have you made sure it's not under warranty? If you think it may
    still be under warranty please contact the manufacturer to file an
    RMA. If you happened to purchase the TV with a major credit card (not
    a debit card) there is a good chance it may still be under the free
    extended warranty most credit cards place on electronics. Please
    contact your credit card company to inquire if they do this, and they
    will be able to file the claim and get you a refund for the TV.



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