LG 37LC7D 37 in. LCD HDTV Logo
Posted on Jan 17, 2011
Answered by a Fixya Expert

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Works fine for 10-15 minutes, then screen goes gray/black and the input flashes in top right corner (alternate gray/black screen and input display). turn tv off, then back on several minutes later - same thing.

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Bud Martin

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  • Master 11,361 Answers
  • Posted on Jan 17, 2011
Bud Martin
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It can be caused by unstable DC in the power supply due to bad DC filter caps, that will be the first place to look. I have a feeling that it may be the main board.
http://www.shopjimmy.com/catalogsearch/result/?q=LG+37LC7D+

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

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

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.


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