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My 42' magnavox the screen went black still have sound but no picture I only have 2 years with the TV

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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

Please post back what you find.

Posted on Aug 02, 2010

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Now,u turn on the tv?U get flashes of pictures only few sec. than died,have only sound left?Yes,than the 2 long board call the LCD inverter boards are dead.These 2 long LCD inverter boards must be replaced.These 2 long LCD inverter boards help the LCD screen panel to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy these 2 refurbishes LCD inverter boards for the replacement.

Posted on Jul 31, 2010

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Posted on Jan 02, 2017

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