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I have a Magnavox 20MF251W/37 that when I plug it in it turns on to the standby mode (red power light). When I power it on with remote or by pressing power button it does turn on (blue power light). Shortly thereafter, I do see an image (snow at this point since I don't have it plugged to any video source). However, that image stays on the screen for only 1 second then disappears. The unit is staying on and is NOT going back into standby mode (power lights stays blue). I have replaced main unit board with a working one - same result. I have replaced power supply board with a working one - same result. I've checked all wire connections don't seem to have any loose fits. Is it LIKELY this problem is associated with the backlight inverter board (I don't have one of these to test it with) or is it LIKELY some other problem I need to investigate?

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  • Terrie Mar 14, 2011

    Thanks for your initial response jdvillanueva: Is it possible to determine the precise problem (e.g., leaky driver transitor or leaky/shorted coil) on the inverter board and repair it or does the entire inverter board have to be replaced? If the entire board has to be replaced do you have any other suggestions besides ebay and shopjimmy for purchasing such a board? If the board can be repaired - is the process similar to replacing a bad capacitor (as I've done this on other TVs) or should it be done by a repair shop. If the repair should be done my a repair shop can you recommend a service provider?

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  • Philips Master
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Hi tempcheck,
Lot of brand have a common symptom when there's a malfunction in inverter board, it will automatically shuts down the unit. This is because there is a protection circuit designed connected from this board to the main board(other brand from the feedback of power supply) that undergo self test while the power supply initialize. I've suspected that you're inverter board gone to overload or produced over voltage due to either leaky driver transistor or leaky/shorted coil, changed of resistance value of some resistor. I've already checked ebay.com and shopjimmy.com but you're board is out of stock, try other sources for replacement.
Hope I helped you.
Have a nice day!
Thanks for using Fixya

Posted on Mar 11, 2011

  • Jdvillanueva
    Jdvillanueva Mar 14, 2011

    There some shop that repair even the board only, this will be go to series of test on the parts like what I've mentioned. Defective transistor is easy to find out by an experienced technician same as the coil, capacitor and resistor. Also another option is to ask your local Magnavox service center for the availability of the board. I can't suggest you a local repair shop because I'm not familiar to your country.

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