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Magnavox Plasma Model # 42MF231D/37 S/N AE1C0628000383 ....Has sound, No visible video or OSD; and no sign of backlight..... Visible inspection showed no signs of degraded electrolytics on any of the power supplies. I am suspecting a panel problem??????

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  • ZNREL Jul 30, 2010

    I'll know after I purchase CBA's and Install them, as far as results.




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Thanks for using FixYa. I hope you have already checked the X and Y sustain buffer boards as well while checking any swollen/bulged capacitors on these boards. I’ll suggest you to check the power supply board and replace it if it has gone bad. Also check the controller board which is the board located next to the power supply unit. As there is no picture so it can only be an issue with one of these boards or a component that has gone bad. All this is only recommended if you have electrical expertise and know how to solder/re-solder components as these units contain high voltages even when in off position. Please do accept the solution if the issue is resolved or post a comment for further assistance.


Posted on Jul 29, 2010

  • ZNREL Jul 29, 2010

    I have allready checked all the CBA's for visibly bad caps. None found. Where there were voltages listed alongside the connectors, I checked for these voltages and what I could check seemed OK. Its been a couple of weeks now since I was inside this TV. And unfortunately I never made notes on which connectors and what voltages I checked.

  • Rylee Smith
    Rylee Smith Jul 30, 2010

    Then check the control board the one next to the power supply unit and Y-main and the buffer boards. You'll have to replace whichever has gone bad as the sound is working so it seems to be either of these boards.



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Have sound but no picture


If its not under warranty, pull the back cover and check the capacitors on the power supply. If there are any that are bulging or show signs of fluid leakage, replace them. If that doesn't fix your no picture but sound issue then you have a bigger problem. You can do it yourself pretty cheap and its not that hard. Just make sure you use the proper replacement capacitors.
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Unfortunately the answer isn't a simple one on that set. Just about every board in that set can have a problem that causes it to shut down. The cheaper way out this will be a trip to the shop as opposed to you buying all the boards from a distributor and doing it yourself. A small, local shop will charge you a FAIR price and do it right for you. Plus, most distributors DO NOT WARRANT parts if you are not a professional technician.

Ask friends where they have had work done or call the local chamber of commerce. They can point you in the right direction as well. Avoid the great big places. More than a few techs means more overhead and higher prices.

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Hi my name is Roety,
I can help you with your issue ,
Sounds like a bad SSB small signal board
login as a guest and check price and availability at  
If I have helped you with your issue please click accept.
If you have more questions you can still respond until this post expires,
I will reply asap

I’m happy to help further over the phone at

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