Question about LG 42LC2D 42 in. LCD HDTV

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My tv powers on , but the picture screen stays black and nothing happens. If i turn the tv off and on about 3 or 4 times , it will come on as normal?

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  • Master
  • 11,361 Answers

First, the service manuals:
http://elektrotanya.com/?q=showresult&megnev=LG&megnev2=42LC2D&kategoria=tv&kat2=schematics

Second, please read below so you can narrow down to the real cause of the problems:
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 is some troubleshooting 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

Failed TV and Monitors: http://s807.photobucket.com/home/budm/allalbums

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

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

Please post back what you find.

Posted on Nov 11, 2010

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  • LG Master
  • 8,457 Answers

This problems is the cause by the tv Tuner signal board.The tv Tuner signal board is having problems,it just not dead yet,that all.The tv Tuner signal board,that the board where the incomming broadcasting signal cable plug into it.By replacing this Tv Tuner signal boad,will solved this problems,with ur tv.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish tv Tuner signal board for the replacement.

Posted on Nov 10, 2010

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Posted on Jan 02, 2017

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