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On a Phil/Mag LCD mod# 32MF231D the set shuts down after about 10 minutes. Trying to figure out if the power supply is defective or the main boarde is telling the supply to go to sleep. Found a bad cap(47u/50v) on supply. No change. The big caps are not domed or hot.18volt and 24 volts out are smooth.Ideas? Case histories?

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  • dachshock Apr 17, 2009

    Thanks Guru I AM a tech. The biz is called Shock Therapy Electronics. 9000' in the Rockies. Overheating is a common prob @ this altitude. Extra sinking is a regular task. I'll try it w/ asheet metal plenum &fan



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If you are a technician and you know what you are doing, start the Set with cover open and point a fan as big as possible toward the main board, if the TV stays on longer or does not turn off at all then it was an overheating problem on main board. Replace cooling system, or even better add an additional cooling fan to the heath sink.

If this was not overheating test inverter and power board.

Note this model suffers from overheating related problems, but as you pointed out, a faulty power board, or a faulty inverter board can cause the same kind of shutdown.

Here testimonials from users having the same problem on same model. This is the most complete thread about this model. For many of them it was overheating: Magnavox 32 LCD TV keeps turning off

Posted on Apr 16, 2009


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In most of the case, the problem is defective LED back lights strips, the other problem could be a defective main board.

If you have a LED strip tester, check out the LED strip first, if you don't, try a new main board first, if the symptoms are the same, for sure, the problem is LED strip(s).

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Flat screen tv shuts down after 10 minutes

Fault in the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
Check whether the timer is set to 10 minutes or not.

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Why does my sanyo dp46840 shutoff after 15 minutes and then come back on

That is definitely not a common behavior.

Shutting off and not coming on by itself would be somewhat acceptable, but shutting off and then coming back on is really weird.

If I had to choose I'd go for a bad main board, but in reality it may be the power supply too.

it's just that we've serviced hundreds of main boards and very few, if any, power supplies for DP46840.

I think the best I can offer you is send the main board and let us run it for 20 minutes to see if it'll do the same at our end.

You can see what the price is if we confirm a problem and are able to fix it - the cost is fixed and is at our site.

if we confirm the problem and can't fix it - happens every now and then - then you pay no service fees whatsoever.

And if we can't confirm the problem you'd pay $20 diagnostic fees for us testing the board.

in all cases you pay the return shipping cost unless you send us prepaid return shipping label , which is the same, but some prefer doing it that way.

I understand this does not help a whole lot as it doesn't let you figure out right away if it's your main or power supply that is bad, but the next better would be manually jumping the power supply to activate the backlight and letting it stay that way (main board off - just bypassed) and even if it stays on for 30 minutes it still wouldn't be certain if it's because the PSU is good or if it's because it's not loaded enough.

Trying one of your two boards on a good set OR trying a knowingly good board on your set is the most efficient way of finding out the guilty board.

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1 Answer


Hello Kevin,

That type of issue is usually caused by bad filter capacitors on the power supply board. As the capacitors heat up they can't filter the output power correctly so the power supply shuts off to prevent damage. Here is a link to information and parts list of the capacitors neede3d to repair the power board.

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This is your mainboard needing replaced! Simple as that!

The main sends the pson signal and without have a dead tv.

Please rate if this helped :)

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My Magnavox 32MF231D/37 no longer will stay ON. When I plug the set in (after being unplugged for more than 5 minutes), the green power light comes on as soon as the set is plugged in. As soon as the...

The power is down due to three bad capacitors. The first bad cap is location 2074, which is 25 volts at 2200Mfs. This is the first cap to go down. Next may be the location# 2081, which is a 35 volt 1200 Mf cap. A third one that requires care to extract is location# 2066, which is a 16 volt 10 Mf cap. These are listed as most bad to weak. Any of the noted caps are a 105 degree cap (High Temp). You may use a next higher voltage but be sure the microfarads are exact! Be patient and you will discover how to remove the silver tape and uncover the area you need to remove. I think you will be concerned with the board on your left back. It has been some time since I have repaired this model. But the info you receive will get the power supply up and running. Thanks for asking and show a few hands of support!

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I will say that the part that you bought could have been removed from another LCD and it might not be working properly due to components that become defective when they overheat.
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The only way to get the LCD working is to repair the power supply to the component level instead of swapping it.
In about 95% of the time the power board is defective.
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I have the 26MF231D and it worked great afterward (even though you can't mount it)

Here is how you remove the cover.

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Your LCD main board defect.
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