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

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I get a bright green line on the very top of the viewing area of my flat panel Magnavox tv. It is almost as if the viewing area is pushed down and needs to be centered in the screen or something. I got a solution saying "Check power supply for bad capacitors they will look swollen or puffed up on top, 1000uf 16v 220uf 10v 330uf 10v" I have no idea what this person is talking about. I need help from someone who can explain something to me who knows nothing about TVs, hopefully something more than a sentence please! I can't find the exact model of TV I have. All I know is that it is an LCD 42" Magnavox flat screen.

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6ya6ya
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Posted on Jan 02, 2017

  • 6 Answers

SOURCE: capacitor size

You can get any size/type capacitor from DigiKey.  See this thread for the part numbers I used: http://www.fixya.com/support/r741402-polaroid_flm_373b_lcd_tv_black_screen

Posted on Nov 09, 2008

operas
  • 123 Answers

SOURCE: Free 32" Magnavox TV Manual

try these linkswww.ebookspdf.com/search/dopod+810/page/7/www.scribd.com/doc/6420346/Panasonic-TC37LZ800-manualjavascript:;

Posted on Jun 13, 2009

  • 1 Answer

SOURCE: Magnavox 42 LCD 42mf438b/f7 turns on/off by itself

I have exactly the same problem with a Magnavox LCD 42", very similar model 42MF437B/37. I don't have a solution. If you unplug the TV and plug it back it starts working, sometimes for hours, sometimes for less than 5 minutes, before it turns off again. Does anyone have any real solution?

Posted on Aug 01, 2009

MNfisherman
  • 11896 Answers

SOURCE: Tv went off and won' come back on.

Most likely you will have to replace the power supply. It is a very common problem especially in newer electronics. You can test it with voltmeter or multi-tester. They tend to get worn capacitor inside the power supply due to cheaper parts

Posted on Aug 24, 2009

SuperTech-11
  • 1591 Answers

SOURCE: Failed Repair Job. A friend of mine called a

replacing the 10V caps with 25V caps is perfectly fine. In fact, if it was manufactured like that, those caps may not have blown.
Replacing a 680uF with a 1000uF could be problematic depending on it's function.
680uF is pretty specific when 500uF and 1000uF are much more common and therefore cheaper - one would think that the engineers would have tried using those in the design rather than a 680uF - makes me think the value of the cap is important to the frequency of the circuit it's in.
Other concerns might be whether he got any of them in backwards or not.
That's a rookie mistake, but still an easy enough one to make (for a rookie).
Also, with that many swollen caps, I wonder if there were any that leaked out the bottom before swelling at the top (IE - if some caps were missed in the replacement procedure)
Also, with that large a number of caps gone, other components may have been compromised or blown.
I'd be testing the transistors around those caps (most likely punched through rather than open), looking for fusible links (surface mount fuses, 0 OHM resistors) that may have opened up etc.
The initial attack on the problem was basically correct, and in many cases probably would have fixed it (if say the 680uF cap was functioning as a ripple filter).
But when that didn't fix it, a deeper analysis should have been done to complete the repair (including locating a 680uF cap).

Posted on Feb 27, 2011

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