Question about SNK Magnavox 15MF227B 15 in. LCD TV

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TV repeatedly turns off after starting until it's warmed up

When you turn on the TV it will turn off several times in the first 5 minutes before it stabilizes and stays on. Each time it turns off, it has a different symptom. Symptoms include: Sometimes will begin with a VERY loud fuzzing sound (two different fuzz sounds) just prior to shutting down. Screen also distorts when this happens. Sometimes will shut down silently. Sometimes will shut down and automatically restart. Sometimes will shut down and stay off. Sometimes will shut down, auto restart, but freeze and require removal of the plug to restart the unit.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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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,
Alex's TV Service,
Philadelphia,
Pa, 215-806-5980.

Posted on Jan 21, 2010

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  • 736 Answers

SOURCE: My magnavox 42mf438b lcd tv will be fine for about

that set is highly rated by users .. it first came out in early 2009 (i think) so you might check to see if any warranty remains ... the display is illuminated by several lamps .. each lamp has its own high voltage inverter .. all the innverters are powered by an output of the low voltage power supply (often 18 volts)... i would suspect a problem with that low voltage power supply.. either a bad capacitor or a thermal issue .. .. ..

Posted on Apr 10, 2010

  • 84 Answers

SOURCE: Out of the blue, our TV screen has decided to go

There is a part called a projector in your tv, it projects images, sometimes it expires or gets finicky, i would recommend replacing that part.

Posted on Jul 17, 2010

  • 6 Answers

SOURCE: The tv picture is going out. It turns off and on

Chinese piece of ****. It is what the USA deserves.

Posted on Jul 22, 2010

budmrtn
  • 11361 Answers

SOURCE: My magnavox 42mf230a lcd tv

The 24vdc power supply may be going out due to bad DC filter caps, look for bad caps with leaking/bulging tops first (notes: bad caps can look normal too).
Then check the backlight inverter board to see any sign of burnt parts. Please try my guide below.
First, look at the screen in darkened room to see if you can see any slight glow from the screen, if it does, then the problem can be the T-CON (not getting the 12vdc) or the main logic board not feeding the signals to the T-CON board.
if not, next place to check will be the power supply module, make sure it has 24vdc which is required by the backlight inverter to work, the reason for not having 24vdc can be from bad DC filter caps (leaking/bulging top, high ESR) or short circuits in the inverter board which will cause the 24vdc supply to go into shutdown mode, so you may have to disconnect the power cable that feed the inverter board to see if the 24vdc will work without the inverter board hookup, you will need to apply about 3~4 amp of load to the 24vdc to make sure it can handle that. There are fuses on the backlight inverter boards also. So there are some troubleshoot you will have to do to find out the causes of the problem you are having.

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Please see my basic troubleshooting guide here:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide

http://s807.photobucket.com/home/budm/allalbums

http://en.wikipedia.org/wiki/Capacitor_plague

Parts: www.shopjimmy.com
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make a kit for you.

Posted on Aug 14, 2010

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