Question about Philips Magnavox 42MF521D/37 Television
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):
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!
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Posted on May 05, 2008
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
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
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
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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Posted on Jan 02, 2017
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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:
Feb 08, 2009 | Philips Magnavox 42MF521D/37 Television
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