You may have failing power supply due to bad DC filter caps, that will be the first place to look, report back what you find for further help.
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
The technical advise provided by the Fixya team were very helpful in fixing power-up problem of our Samsung LN-T4042H TV. Four bulged capacitors - CM 806, 811, 812
Thank for your feedback, this will help out other people also, If you can, you should replaced all the caps in the secondary side DC filter caps, because more likely the other will fail soon, please make sure to use good caps with 105c rating and low ESR type.
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