Question about Philips Magnavox 42MF521D/37 Television

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Magnavox 37MF321D/37 Units power light blinks on and off no picture screen flashes as it blinks was working fine and turned it on one morning and this is all it does

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  • Anonymous Apr 04, 2008

    tv is on watch it for 10 mins or so and then off then back on over and over agasin want to do

  • jblake6942 Apr 05, 2008

    Same problem, power light flashes and the TV won't turn on.

  • Anonymous Apr 26, 2008

    i have the same problem,with same model. power light blinks,screen flashes. will come on after a period of time. picture is great. everything works fine after it comes on.it is takeing it longer & longer to come on

  • Anonymous Jun 12, 2008

    Well they arent showing my model number ....but mine is ( MF32ID/37 ) and have the same problem for the last 6 months. Since when did we have to worry on how to get our televisions to turn on or off??????Sometimes it will turn on in 5 minutes....today I've been working at it for 9 hours....INSANE!!!

    Usually the led light on the power will flash for however long .Also the screen might flash a few times. When the power light stops flashing , it shuts itself off. I will use the remote to turn it back on . The power light will glow bright and steady , then shut down again. I have to do this usually 6 to 7 times, and the picture will finally come on. My television has now taken over all my extra time.

  • Anonymous Aug 21, 2008

    Same problem, power light flashes and the TV won't turn on. I purchased the extended service plan, so I called for service.

  • Anonymous Jan 25, 2009

    I have the exact same problem. My 2 year old (seems to be a common age to have problems so says net searches) 37" magnavox model 37MF321D/37 will blink green repeatedly. Sometimes the screen will flicker for a little bit but usually shuts itself off. I unplug it for several minutes to reset, some days 2 or 3 times and then all of the sudden it turns on like nothing is wrong. Other days it will blink all day and never come on. The only thing I have seen is to download a firmware upgrade, but I cant find it on the magnavox site. I can leave it on continuously with a small fan directed on it and the only problem then is it will shut off for 5 seconds then come back on. Not an ideal fix. Come tax time I will replace this piece of junk. I was a hard core magnavox fan... until now.

  • ciii Feb 24, 2009

    Same problem.. I have a two year old 37" Phillips Magnavox that the power light flashes but never cuts on. I have tried to unplug the power sourse to reset but to no avail...I have found that while the power light is flashing I can sometimes press the A/C H button and hold it down the TV comes on (probably just coiencidence)...I have had it with Phillips and will NEVER purchase another product of any kind from them or their parent companies!!!

  • miratessa Mar 03, 2009

    mine does the same thing!! Haven't been able to get it on now for almost 2 weeks! It is under 3 years old, i just don't get it!

  • B-rock32 May 11, 2010

    irishdruid mentioned replacing a board and i was just wondering if anyone knows where that might be found. i live in a small town so i would have to go online or look next time im in salt lake. that would help a lot if i could get that info. thanks

  • Anonymous Mar 15, 2014

    Hooked speaker wires from steario to tv speeaker termiinals by mistake. Sounnd doesnn't work now. Reversed current.

  • Bradley Santiago
    Bradley Santiago Apr 08, 2014

    capicator . easy fix

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6 Answers

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  • Master
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1. Try this - hold the menu button down for 10 seconds. TV should power up; you will have to turn off front panel buttons on menu.

2. You can also try plugging in the TV through the USB on its panel to a computer or USB charger, and it may work. However, this is only a temporary solution.

3. Powering down the set or putting it in standby may have allowed the power supply to cool. Weak capacitors often go out of spec when they cool, thus preventing a section of the power supply from firing up properly again. There is a simple trick...just warm the back of the TV with a hair dryer for 5-7 mins after you have unplugged the TV. Look for the little areas of holes in the back panel of TV. Use these as your guide at where to use the hairdryer, but don't hold the dryer too close (say 5-6inches away). (Make sure the dryer is on High heat). If the TV doesn't turn on after you have heated it up (like it tries to come on but then turns off) you need to unplug the TV again, this resets it. And repeat those steps till it works. Resetting the TV after it fails to turn on is the key. Also, just leave the TV on. Don't turn in off. Since it is LCD, it doesn't take much power...only a few bucks extra a month for your utility bill.

4. A circuit board may crack about some of the larger components mounted on it. You can inspect the PCB's for fractures, and then repair them. It may also be poor soldering that has failed. I would be checking for these things first.

5. If you want to go in for a long term solution, you can easily replace the whole power board or just change the faulty capacitors. You will have to open the back panel and take a look. You can make out which are faulty, because their caps will be swollen on top. Here's a sample pic (not same model):
Magnavox 37MF321D/37 - 6cc82db.jpg
Check the specifications of the faulty capacitors, and get the replacements from your local electronics shop. If you are comfortable with this, you can use a pair of needle nose pliers to G-E-N-T-L-Y pull out the defunct capacitors. Once that is done, solder in the new capacitors carefully. If are unsure how to do this, try to get a friend who knows how to do this kinda stuff do it for you, or get a qualified technician. Warning: If you do not have a background in electronics repair, or are inexperienced, get a qualified technician to do it for you.

REMEMBER there are very dangerous voltages inside a TV that can KILL. Be sure to work SAFE when dealing with electricity. DISCONNECT THE POWER BEFORE YOU DO ANYTHING.

Hope that helps!

If your issue is not resolved, please do not assign a rating just yet. Please post back as to what steps you took, results, etc, and I will try to assist you further as best I can. I am here at your service.

P.S. -You can rate this solution with one of four votes, if you feel your issue is resolved (remember that at times a bit of to and fro dialogue may be necessary to resolve an issue).

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IrishDruid

Posted on May 05, 2008

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Ive been having the same problem as many others concerning this tv model...i have located the power supply...i have one 2200uf 26v capacitor that needs to be replaced...no problem...there is also a burn mark on the underside located directly under a 1n914 diode which will also need to be replaced...
http://www.fixya.com/uploads/images/5DF38CD.jpg...this pic is one i found of the power supply for the magnavox 37mf321d/37. my question is in the picture on the bottom half just right of center what is it (it has a yellow tape on it)? on mine it has a brownish liquid, will i have to replace it along with the capacitor and diode

Posted on Apr 04, 2010

  • JaredBoomgaa Aug 30, 2010

    This is exactly what was wrong with mine. The power supply is easily located, at the end of the power cord. That thing with the yellow tape on it, I'm pretty sure is a transformer. There was nothing wrong with my transformer. Also, on capacitors the arrow points to the negative lead. DO NOT skimp and just replace the capacitor, because the capacitor was about $5 at radio shack (35v 2200uf) and the diode came in a package of ten for a little less than $1.50 and you're risking your capacitor by not replacing it, and its (the diode) easier to remove and replace than the capacitor is. The capacitor I bought had one lead at each end, as opposed to the original, but it works fine and there is plenty of room on the board to lay it down on its side even though the original is smaller and upright. I used electrical tape to make sure the capacitor leads don't touch anything you don't want them to. TV works fine. Thanks crystalgolem. The pic was extremely helpful.

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  • Philips Master
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Remove the back cover. Look on the left lower part ot the tv. remove the foil tape. remove this. Remove the four or five screws on this board, and flip it over. Two Capacitors location 2074 which is a 25 volt 2200mf 105 degree cap. It is bad, replace with exact kind. Next cap to look for and occasionally goes on the fritz is located at 2081 which is 35volts 1200mf, just sometimes its bad. You decide if it should be replaced. Take the wife out to her favorite restaurant with the money you saved on repair. See you there.

Posted on Jul 08, 2009

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I disassembled my TV today, found 2 of the larger capacitors on the power board were swelled. I will be replacing them with a high quality capacitor, along with the other 2 of the same brand. Will let you know what happens. My thought was that the 2 caps were enough to get the screen to flash but not enough to get the thing to fire up the whole way.

Posted on Jun 21, 2009

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  • MTUJeeper Dec 13, 2009

    I replied above, here is an update. 2200uf was leaking badly, ordered a 2200uf 35v and they sent me a 50v. It was too tall, so my board isn't mounted as flush as it should be, but it doesn't seem to be a problem. I also had the 1200uf leaking a little, and one of the 1000uf caps swelled. I figured why not just replace all of them. The place I bought them from couldn't get a 1200uf cap, so I ordered a 1000uf cap and 220uf cap (both radial). I had to open the holes in the board a little to get both cap leads in there. I soldered the 1000uf on the top in place of the 1200uf, and on the bottom side of the board I cut the leads about 3/8-1/2" long, stuck them in and bent the cap over and re-soldered. It doesn't provide any interference with mounting, but I put a piece of electrical tape over it just to be safe. Assembled everything back together and it works just fine. Just got done watching a movie on it. Cost 8.00 for the capacitors, and .79 cents for electrical tape (couldn't find mine). Not bad for a TV I got from a guy while taking my trash to the dump!

  • MTUJeeper Dec 13, 2009

    Oh, the reason I replaced the 2200uf with a 35V cap (really used a 50V, but 35 is what I wanted) instead of the stock 25V is I read somewhere that the circuit is actually 29v there, and it cooks the cheap caps used in assembly. Walmart TVs are the same on the outside as what you may find at other stores, but there internals are different. They actually have a slightly different part number. They are manufactured cheaper so they can be sold cheaper (according to my housemate).

  • MTUJeeper Jan 14, 2014

    Over 4 years later and the TV is still going strong! WOOHOO!!!

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I have the same model. Luckily we bought the extended warranty and had the set repaired. The technician came and replaced the power supply. I looked at the old one and all the capacitors were swollen.

Posted on Mar 15, 2009

  • rcpilot123 Oct 18, 2013

    Update - I ended up doing exactly the same as MTUJeeper by replacing the swollren caps. It's an easy fix and I used larger voltage caps than original and larger uF values becuase that's what I had in my can of capacitors. Works like a charm

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OK Every one. Try the unplug and plug in solution. Amazingly this worked for my sound problem. I am so happy I don't have to replace any circuit boards or anything else (power board etc.) as was previously suggested.. 

Posted on Sep 05, 2008

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