Question about Philips Magnavox 42MF521D/37 Television

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Magnavox 42MF521D LCD TV won't power on

It turned itself off in the middle of a football game and won't power back on. i unplugged it for 60 seconds and replugged per the owners manual but that didn't fix it not did trying the plug in different outlets. i called magnavox support and they agree that it probably is a fuse. i need instructions on how to replace the fuse though. thank you.

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I would not suggest trying to repair it yourself as you have to disassemble the unit and unless you are comfortable doing so and know what you are doing, you may damage something else. It may be a fuse but there is also a possibility of it being the power transformer or a component such as a diode or transistor. It is best to have a professional tech check it out. That way if it is something more serious, they will be able to determine what it is and repair it more easily. It may cost a bit more but better than irreversible damage to the unit.

Best wishes.

Posted on Jan 04, 2009

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Magnavox television won't stay on


I know this is going to sound strange but I have something to check. If you have LED lights in your house turn them all off. When they are off turn on your TV and see if your TV stays on. Yes, there could be many problems but this one is cropping up quite a bit. If this does not work then you need to take a look at the power supply board.

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First place to look is to follow the power cord inside the set to the main fuse---look at that first. If you are not able to do that get a shop or tech to look for you.

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TV turns on in the middle of the night


  1. If the TV has a timer option, ensure it is disabled.
  2. Check the remote control to see if any of the buttons are stuck that may be interfering with the TV.
  3. Unplug the power cord of the TV from the AC wall outlet for 60 seconds.
  4. Plug the power cord back into the AC outlet.
  5. Attempt to turn on the TV.
  6. Remove all remote controls from the room where the TV is located.

OR

unplug all HDMI sources to see if a device is sending signals in the middle of the night

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LCD will not power on as of latley with out messing with it


Sounds like you need to repair the power supply, don't fret, it can be really easy. Here is a pair of youtube videos I made after following some advice on this website from other posters:

http://www.youtube.com/watch?v=qSS6ycUxS98

http://www.youtube.com/watch?v=oTOkHKPJsnM

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1 Answer

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Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

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Most likely you will have to replace the power supply. It is a very common problem especially in newer electronics. You can test it with voltmeter or multi-tester. They tend to get worn capacitor inside the power supply due to cheaper parts

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Try to replace the Small Signal Board (SSB Assy) of your tv.

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1 Answer

Television Turns on and then Turns Right back off!!!


Either a short in the High Voltage section or power supply section. If you are not a TV technician you will have to find a reputable repair shop to help. Good luck.

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