Question about SNK Magnavox 15MF227B 15 in. LCD TV
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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Posted on Jan 02, 2017
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.
Alex's TV Service,
Posted on Jan 21, 2010
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
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
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:
Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make a kit for you.
Posted on Aug 14, 2010
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