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Lg hdtv troubleshooting
Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time.
You have a bad micro processor on the main PCB. Remove back cover, board on right side, find part# on board and replace. Shop Jimmy is a good source for TV parts.
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