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How to replace power supply for magnavox tv /37mf321/37

How to replace power supply

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Posted on May 10, 2014

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Magnavox tv won't turn on or off


Hello,

The typical cause of power up problems in a failure of the power supply filter capacitors. The board can be repaired by replacing the bad components. Below is a picture of the power supply board with the bad capacitors circled and below that is a link to a it that is available with the correct parts to rebuild that board.


10_1_2012_3_58_30_pm.jpg

http://www.ccl-la.com/catalog/product_info.php?products_id=216


I hope this helps you out,
BuddyMc

Sep 25, 2012 | Toymax Magnavox 37MF331D 37 in. LCD TV

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Magnavox Television


There is an 8amp 250v 5mm x 20mm ceramic slow blow fuse on the power supply board inside the TV. The picture below shows the board with the fuse circled in yellow. If you had a big enough power surge it may have damaged other parts of the power supply beyond the fuse. Look for burn marks on the power supply board when you replace the fuse. If you need additional information just let us know tech@ccl-la.com
7_25_2012_6_32_04_pm.jpg

Jul 25, 2012 | Magnavox 40MF430B LCD TV

1 Answer

My magnavox power button is blinking green and wont power on


sounds like a power supply issue very famous for bad power supply replacement power boards are available from www.tvcircuitboards.com

Mar 31, 2012 | Philips Magnavox 42MF521D/37 Television

1 Answer

Power will not stay on , on my magnavox tv model 32mf337b/27 unplugged like user manual suggested but didnt work even after 30 hrs saw on magnavox.com a few people have had same proble with this model mine...


Magnavox has issues with puffed caps on the power supply. This sounds like its a 32 inch lcd tv. I tried searching for a service manual for this and can't find one. If it is an lcd you need to look at the capacitors on the power supply. If they are puffed up, you will need to replace them with equal or slightly larger valued capacitors. The capacitor values are mfd and voltage printed on the capacitors themselves. You will need a soldering iron to replace them. Lay the tv, if it is an lcd, on a flat surface cushioned by a blanket. Make sure the surface is large enough to support the tv frame, as you don't want to cause damage to the panel. remove the back of the tv. There are numerous screws, and once the back is off, check the power supply pcb for puffed caps. This is the board with the power cord attached. I know in magnavox tv there is a cage covering the power supply, so remove any connectors because you will have to flip the cage housing the power supply to get to the caps. If you feel confident, give it a try. Let me know how it goes

Apr 03, 2011 | Televison & Video

1 Answer

37 INCH LCD MAGNAVOX TV WILL NOT TURN ON. MUST BE


This problems,very common in LCD tv,after the tv was in used about a year or two.The new technalogy LCD tv don't handle heat very well,not like the old CRT Tube Tvs.The power supply board tend to have bad capacitors componnents leakage,that bulges up it top or puff up gases escape,that why it take times or couples pushes to the power botton to turn the tv on.U know basic electronic's,and have soldering tools and solders?Take the tv aparts,check for these bad capacitors,that bulges,puff up in the power supply board and replaced them,than ur power will work normal again.Or tries Websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

Apr 29, 2010 | Philips Magnavox 51MP392H Rear Projection...

2 Answers

Magnavox 37MF331D 37 in. LCD TV tv will not come on, power light blinks. I tried disconnecting power cord and hold power button to discharge, still will not come on and as soon as I apply power again the...


I had the same problem with a Magnavox LCD TV. It would not turn on and the light on the external PSU flashed. I found a replacement 12V 5A power supply on EBAY. It brought the set back to life.

Sep 12, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

1 Answer

Magnavox 20mt4405/17 piece of junk!


Hello sletak, This problem is actually common. Your degaussing coil has malfunctioned, causing the power supply to become unstable which in trun is effecting the memory settings in the processor. You have threen problems in one so lets start by looking at the overall cause first 1) degaussing coil going bad (shorted then opened) Replace this and the thermistor that is attached to the degaussing circuitry. 2) power supply instability (power surge from the degaussing circuit) replace the damaged components in the power supply section. Troubleshoot this thoroughly. 3) after fixing the power supply and the degaussing components you will need to manually degauss the TV and then use the auto-degaussing function to do the rest. I hope this helps, Thank you, Shuttle83 http://www.electron-age-technologies-llc.com

Jun 10, 2009 | Philips Magnavox 20MS233S 20" TV

1 Answer

Philips Magnavox 17MD255/17 LCD TV had AC voltage applied.


It seems your "power regulator" a small unit inside tv device has damaged due to wrong power supply. In this case usually the power capacitor burns and few other electronic components like triodes. Get the help of a electronic chip technician to replace the damaged components.

Hope it works.

Mar 28, 2008 | Televison & Video

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