Question about Toymax Magnavox 37MF331D 37 in. LCD TV

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Philips Magnavox 37" LCD Flat Screen 37MF331D \37

Is it possible, my dear TV expert, That I could have a simple capacitor problem like some of the Poloroid's Ive read about. Again, it doesnt want to switch on. Started by taking a while, then longer......and....you get the pic. ( The capacitor prob I speak of manifest itself as caps expand on top ) Any help greatly appreciated......

PS I do the fixya on the Automotive stuff, so if you need help with youre ride...Let me know.

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  • Anonymous Feb 16, 2009

    power light flashes breifly will not stay lit, need to keep pushing power button...acts as if stuck in standby...then quit working altogether...unplugged a few days and messed w it more ..now it is on...just gonna leave it on till i find a fix...

  • deltadeliver May 11, 2010

    when i change the capacitor do i need to worry about the pos and neg

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There are two capacitors in the internal power supply regulator board that have been the main culprit of this particular issue. You can identify the bads ones by the slight buldge at the top of the capacitors.

Posted on Apr 06, 2009

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Power supply is the problem. I had the same issue. Cost $250 at the local repair shop but it's worth it. The shop said it has replaced a dozen power supplies in that model in the past cople of months.

Posted on Apr 28, 2009

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Sure you can send this out to be fixed for $150-$250 at a local repair shop, or you can do ebay for $99, but that may not solve the problem. The main board could have a problem now as well with running to hot at a different voltage for to long. Will sound be a problem, or video?!?

So this could fix the tv but for how long. The wear and tear on the other components makes me hesitate repairing this unit. Do I spend the money here, or do I reinvest it in a new TV.

Posted on Jan 04, 2010

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I have a mag. 37 lcd......same prob wouldnt come on but had power, just had it fixed and it was the power board/power supply......it cost me 190.00 to have fixed

Posted on Feb 07, 2010

  • mwrozmen Dec 26, 2010

    Capicitors 2074 and 2081. 6 bucks in parts and a buddy fixed it. Not to shabby for a trash pick pick up!

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2 Answers

Can i use a 1000uf 35v for replacement with a 1200 uf 35 v? for a magnavox 37MF331D 37 in. LCD TV


Absolutely NO! Although it may be close, you will find a poor startup just as if the set was still bad. The capacitor you need is of course a 25 volt 1200MF. In this case a 35 volt 1200MF will work. I would suggest in this case a next up voltage with the correct MF. In this case the best sub is the 35 volt 1200MF. Check out Matelectronics.com. or MCM Electronics.com or Mouser Electronics .com. If you have a local Electronic supply store they may have what you need. I do not believe you will find it at Radio Shack. Thanks for asking and show a few hands of support!

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I lost the picture on my 37" LCD model 37MF331D/3. The audio is fine.


There are two places to look for the problems, the backlight inverter board and the power supply. 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.

Dec 03, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

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Need to get a schematic of the power board in a MAG 37MF231D part# 31381036294.3 for T/S purposes. New board just to expensive.


Replace cap location 2074 which is 25 volt 2200Mf and cap location 2081 which is 35 volt 1200Mf. You can visually see these when you remove the back...Good Luck! PS...be sure they are rated at 105 degrees!!!!

Nov 17, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

1 Answer

My 2 year old Magnavox 37MF231D/37 LCD TV just blew the picture screen. The audio comes through fine, but the screen is dead black with no menus, info, nothing. I tried various inputs, same result. I...


The problem can be in the backlight inverter board (hard to get to), or the main power supply module may not be working. Look at the power supply first since it is easy to get to, look for burnt parts, bad capacitors.
http://en.wikipedia.org/wiki/Capacitor_plague
Please

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1 Answer

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Your set either has a bad SSB (small signal board) or needs a software upgrade. Try the upgrade first by going to http://www.m4c.magnavox.com/cgi-bin/dcbint/cpindex.pl?scy=US&slg=AEN&cat=FLAT_TV_CA&sct=LCD_LARGE_30_40_SU&grp=TV_GR&session=20090830171041_4.131.87.247&ctn=37MF331D/37&mid=Link_Software&hlt=Link_Software
Download the latest software release for your set then follow install instructions that are contained in the user manual for your set.

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Disconnect the LVDS Cable that runs from the small signal board to the display panel and apply power,if the screen comes on,the Small signal board (aka Scaler Bd ) is the faulty board. other than that,all that's really left that has gone bad for me is the logic board.

Feb 19, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

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