Tv turns it self off after only 2-3 seconds and makes crack noise

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check for bad capacitor in the power supply board and then check shorted component parts at the sustain board.

Hello Junior,
This type of failures is commonly due to defective capacitors in the power supply.
Check the video from the link.. LG 50PC1DA Not powering up clicking sound no picture or sound Diagnosis

If nobody at home how was the tv on?!?!?!?!?!? U must have a poltergeist living there if you stick to that story!

Screens do not just crack all by themselves - they need a little help. And product warranty's do not cover abuse. So yeah, you will be eating the 2 big ones.

The most likely the TV has a power supply related problem. A power surge can cause the problem. Last thing you want ot do is void the warranty by opening up the TV. Here's info to get your warranty started:
http://www.lge.com/us/support/repair/support-warranty-claims.jsp

With a problem like this, I would use the warranty for the TV.
It's possible a circuit board failure has occurred and the TV is automatically turning itself off to protect it from further damage. Is normally called " Protection Mode " for most TVs.

Being that it's 2 months old, it should be under warranty regardless. I would recommend contacting the store of where it was purchased and have them help you with the warranty issue.

hello my friend, your problem is with the Y or Z SUSTAIN BOARDS if got to feel the stimulus package replaced boths.

You can have them repaired but, usually the cost of a new plasma panel exceeds the cost of replacing the set.

Hi there, Im Kanth, i had the same problem, and i found a person in Mississauga, they fix all kind of problems in Plasma, they fixed my LG before a 7 months, its still running good, i came to know lots of ppls were having same problems, i sujest u to being the plasma to electronics @ Dixie and Britannia Mississauga, call them now 905 565 6595 or check there wesite for more info. http://dukeelectronic.com