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I hAve a 15" magnavox model 15mf400t/37 it works for 5 secs and screen goes black with sound what can I check

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  • yadayada
    yadayada Dec 13, 2016

    Just Google "LRD TV has no picture with sound"

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moorah1
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SOURCE: magnavox plasma tv model 42mf230a/37 sound but ni

Replace lower scan converter PCB, which plugged into Y-Sustainer Board, located to the left of the display if you poke back cover open. There are 2 of them, but in some models might be the one, long PCB.don't wait to fix it! otherwise, you will knock out Y-
Sustainer and upper scan converter. That will cause you to spend few hundreds to fix it.
Good luck,
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Posted on Jan 21, 2010

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caroldon
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SOURCE: I NEED A POWER SUPPLY AND CORD FOR A MAGNAVOX 15'

Either you can get this universal type available inthe market in any electronic spares store or it is easy too make one by yourself if you are familiar with electroncis.
All you need is a mains transformer with secondary voltage at 12 volt and 4 amps capacity, use a bridge rectifier , good storage capacitor of about 4700mfd/25 volts and if possible use a 12 V regulator so that the power is smooth, regulated and protected..

Posted on Sep 24, 2010

  • 586 Answers

SOURCE: "I have a rarely used Magnavox 15MF400T/37 Series

Hi,

first, make sure the Tv is correctly plugged into the wall. You can try another outlet. If that doesn't work, then your Tv is certainly having a power problem.

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.......

But more often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes).

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.......

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

Yours sincerely.

Elect_Comp.

Posted on May 15, 2011

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Magnavox 15mf400T/37 screen flashes on for a second then goes black


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I turn on my TV and after a few sec the screen goes black?


Hello,

First check if your televisions screen saver is not on, then check if you do not have your television on some settings that could cause such. Once you have verified that, then it means it is a hardware problem.

The causes of such problems are either bad lamp or faulty t-com board. The solution to the problem is for you to have the the television opened, assess the lamp and t-com board and replace which ever is faulty.

Take care and good luck

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I NEED A POWER SUPPLY AND CORD FOR A MAGNAVOX 15' LCD TV MODEL NUMBER 15MF400T/37 POWER RATING 12V 3.5A


Either you can get this universal type available inthe market in any electronic spares store or it is easy too make one by yourself if you are familiar with electroncis.
All you need is a mains transformer with secondary voltage at 12 volt and 4 amps capacity, use a bridge rectifier , good storage capacitor of about 4700mfd/25 volts and if possible use a 12 V regulator so that the power is smooth, regulated and protected..

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Magnavox 15MF400T/37 No Audio


Get a set of multi media speakers and connect them through the microphone plug in the back. I have mine set up this way and the sound is awesome. I purchased the Creative T-10. Can be found on ebay for around $15 + shipping.

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Need Universal remote code for Magnavox 15MF400T/37


these are the codes associated with Radio Shack's line of remotes:

One for All Universal (Radio Shack)
0054, 0179, 0030, 0020, 0024, 0096, 0186, 0171

And I was also able to find these:

UNIVERSAL REMOTE CONTROL CODE LIST for TVs
MAGNAVOX
002 009 109 118 209 309 402 408 502 508 510 807 914 917

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2 Answers

Need Help


check the cable connecting to the System unit!, it could have loosen up!
tighten it

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