20 Most Recent LG 42LH40 LCD TV Questions & Answers

There might be an off on switch under the lower right hand corner of the set. (feel for it) and switch it.

Refer to your owners manual for the set. If you are missing it, just search the make and model to locate it. The manual will provide reset information.

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. http://electronicshelponline.blogspot.com/ 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.

Sounds like a motherboard fault. Contact the authorized service center for LG. It will be best. Gopakumar Gopalan Google

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A firm ware upgrade might solve this problem. Upgrading your RAM, if not, the procesor ic on the main board.