Question about Toymax Magnavox 37MF337B 37 in. LCD TV

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Magnavox turns on then goes off model 37f337b/37f437b

Turns on then goes off

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More than likely power board,usually repairable,look for blown capacitors.A blown capacitor will look like the top is rounded also suspect capacitors will show signs of the plastic coating shrinking .

Posted on Apr 20, 2014

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I have a magnavox 42"


Problem could be in the Main unit Board, check out www shopjimmy.com

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My Magnavox 42MF231D 42" T.V


You may have a weak power supply. This would indicate one or two capacitors that are weak or bad. This model may be about 4 years now and this is a good indicator as these capacitors need replacing. The other problem may be the infared board in the TV that receives the signal from the remote may be a problem as well. I would certainly investigate my first thought. The latter is kind of rare. Thanks for asking and show a few hands of support.

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1 Answer

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You may be experiencing the death throes of the main power supply.
BTW, you should always include the make and model numbers of ALL devices, not just one. You may have a model that has known issues that one of the techs has already dealt with.

Mar 14, 2010 | Philips Magnavox Learning Universal Remote

1 Answer

Magnavox 42 LCD 42mf438b/f7 turns on/off by itself sometimes screen goes blank tv unresponsive to remote


I have exactly the same problem with a Magnavox LCD 42", very similar model 42MF437B/37. I don't have a solution. If you unplug the TV and plug it back it starts working, sometimes for hours, sometimes for less than 5 minutes, before it turns off again. Does anyone have any real solution?

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1 Answer

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1 Answer

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check your set. maybe you turned on SLEEP. it will automatically turn off. 

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