Question about SNK Magnavox 42MF438B/27 42 in. LCD TV

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We have a LCD 42" Magnavox tv. We had it on the picture went dim then the picture went away all together. Now all we have is sound.

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  • SNK Master
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The power inverter supply board is bad. Have a tech replace this! Thankyou for asking!

Posted on Apr 27, 2010

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Posted on Jan 02, 2017

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How to fix my magnavox LCD tv, the picture went out, have sound


Hi Daryl,
This is a common problem with LCD TVs. Back light failure is the cause in most of the cases. I do not think you can do anything about it yourself. Please consult a local TV tech.
Good Luck

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I HAVE 42 INCH MAGNAVOX PLASMA TV AND THE SOUND WORKS BUT THE TV DOES NOT SHOW A PICTURE AT ALL IT IS JUST ALL BLACK,COULD IT BE THE PICTURE TUBE THAT WENT OUT.


yes...the video card could have gone out but most likely you have a connection that is loose or bad. I would check those first. If you have done so then I would try another video port and verify that it is the screen that is out and not just the port you are in.

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2006 plamsa 42 in has sound no picture was


its a 2006 LCD tv its supposed to that.

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Change power supply capactors. you will see two capactors that have the tops bubbled out,change them and unit will work great.

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Magnavox HDTV very dim


hi i have a philips 42 pfl5522d and need a new screen can you get me one..

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42 inch LG Plasma TV - Lost picture


Most likely what happened is one of the capacitors went bad. When a capacitors goes bad it produces a popping sound. This could be an easy and cheap fix if you find the bad capacitor or capacitors. The bad capacitor will have a bulging top most likely on the power board but could be anywhere.

Feb 24, 2009 | LG 42LC3R 42 in. LCD TV

1 Answer

42" magnavox plasma started to smoke, has audio but no video?


power board replacement a burnt circuit is visible upon opening unit and removing the power board.

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1 Answer

No picture but has sound


Regarding the Plasma TV with dark picture, this is often caused by bad sustain board, replacing the Ysus Zsus kit may solfe the problem.

Regarding instead the Vizio with sound but no picture:

If an LCD TV has sound but no picture do the following:

Use the source button to ensure that source is not set to the wrong input.

Try unplugging power cord for ten minutes, to ensure it is not a setting problem.

Check all the video cables at the back of TV.

Check Light /Color settings.

If problem persist and does not depend on external receiver or settings, then it is likely an internal fault.

If it has sound but no picture then one of the following parts is faulty, and must be tested and replaced:

The inverter is the high voltage board that provides variable power to the backlight lamp. This is the most common. When inverter is faulty you can get no picture, or a very dim picture that can only be seen by pointing a torch light with a 45 degree angle on the LCD surface from very near distance.
The inverter must be tested by reading voltages with a multimeter.

The LCD ribbon cable/LCD display and connectors.
This is quite uncommon, but happens. If the TV had been hit or moved the LCD cable may have slipped out, or the LCD connector may be damaged.

The LCD controller board.
This is the board that controls the video signal, it is difficult to test, as there is need to read determined values on IC pins. To test this board you need to purchase a service manual and follow the troubleshooting diagrams on service manual.

Input/Output Signal boards.
This are the boards where you connect the video and audio cables, if a signal board is defective, then you may get no picture on particular inputs located on faulty board.

If under warranty contact the manufacturer ringing the number on the user manual.

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |

Oct 14, 2008 | Philips Magnavox 42MF521D/37 Television

4 Answers

Magnavox Plasma HDTV Red light


I had a similar problem with my magnavox tv with the blinking light issue. Eventually it just didn't come one anymore. Looking at other forms they said the problem was a bad capacitor number 2074 located on the power supply board. When I opened my tv, I noticed that the capacitor was bulging and burnt up. I bought a new one labeled 2200uf 35v and did some solder to attach the new piece. Put the tv back together and it works like new. No more blinking light. I hope this helps.

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