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Lg lcd 42lg3 tv was working last night got up this morning power goes on but no picture or sound

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I HAVE A 42 INCH PHILLIPS LCD TV IWAS WATCHING WHEN THERE WAS A BANG LIKE CRACKING NOISE AND THE TV WENT OFF

Posted on Aug 02, 2010

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Check the power supply module to make sure it has all the outputs, it sounds like thge 12vdc and the 24vdc are not on, it can be that it is not receicing the PS_ON signal from the main board or there is short circuits in the backlight inverter board that will cause the power supply (12 & 24vdc to go into shutdown mode), you can try disconnecting the power cables to the inverter board to see if the 12 & 24 vdc will come back on.
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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Posted on Jan 02, 2017

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