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Magnavox, no power,no green light, model 37mf321d/37

Any Suggestions? No flashing green light. Nothing.

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  • crip921 Oct 27, 2008

    no green light, no power, just a dull flicker. Tried to unplug for over 1 hour and re-start, no luck.

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3 Suggested Answers

IrishDruid
  • 2712 Answers

SOURCE: Magnavox 37MF321D/37

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):
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

thekleppinge
  • 5 Answers

SOURCE: My magnavox 37mf321d 37 LCD tv

This is a bad power supply and an easy fix. Their are several electrolytic capacitors on the power supply. If one is bad it will have a bulge on the top. Mine had a bad 2200uF and a bad 1200uF capacitor. About $7 worth of parts at Radio Shack. Radio Shack had the 2200uF but it was axial leads instead of radial. (leads come out of each end instead of one end) but It will still fit. They only had a 1000uf capacitor so I combined that with a 220uF capacitor and wired them in parallel. Make sure you put them in with the correct polarity.

Posted on Dec 06, 2008

  • 6 Answers

SOURCE: Magnavox 37MF321D/37 flicking on & off

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

Posted on Sep 02, 2010

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1 Answer

Magnavox 37MF321D/37. suddenly just shut off and would not turn back on, no blinking green light nothing!


Price the board first and then decide, I fix these in our shop but do not like or enjoy working on them at all.

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I just fixed a similar problem on mine but the power light was flashing at the same time the screen was flashing. I made a video showing what part and how to replace it. I also added a link to the part I ordered. L5973D STMicroelectronics Mouser

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1 Answer

37MF321D/37 TV turned off last night. This morn, won't turn on


Please read these replies to the same problem. A new power board costs around $284.00..

http://www.fixya.com/support/t465280-magnavox_37mf321d_37

Jan 01, 2010 | Philips Magnavox 42MF521D/37 Television

2 Answers

Magnavox 37MF321D/37 flicking on & off


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



Feb 08, 2009 | Philips Magnavox 42MF521D/37 Television

1 Answer

Not powering up right away


This is a big problem with these tv's. Magnavox built them with undersized capacitors, and they blow. You have to open the back, remove the power supply and replace the capacitors numbered 2074 and 2081. This sounds like a real tech job, but read my other solutions, and you will see it is not so hard. Good luck.

May 28, 2008 | Philips 37MF321D 37 in. LCD Television

8 Answers

My magnavox 37mf321d 37 LCD tv


This is a bad power supply and an easy fix. Their are several electrolytic capacitors on the power supply. If one is bad it will have a bulge on the top. Mine had a bad 2200uF and a bad 1200uF capacitor. About $7 worth of parts at Radio Shack. Radio Shack had the 2200uF but it was axial leads instead of radial. (leads come out of each end instead of one end) but It will still fit. They only had a 1000uf capacitor so I combined that with a 220uF capacitor and wired them in parallel. Make sure you put them in with the correct polarity.

Mar 05, 2008 | Philips Magnavox 42MF521D/37 Television

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