I need your help with a TV (LG 32LC55)

The TFT is only one month old... the problem is that while it works fine, without reason it falls into standby mode, if you try to turn it on immediately falls into standby again, or turns totaly off.

The owner is well familiar with electronics but he messed the guarantee and it's absolute need for help because he can't locate the problem.

nobody has the slightest idea?

It could be absolutely anything! - and LCD TV's are difficult and expensive to repair - he shouldn't have messed his guarantee!.

thanks for your answer nigel

yeah i know too silly what he did... his tv costs about 800E! and i was hopping that someone might help from here