Hi i have a phillips 26'' lcd which is 4 years old. for last few weeks the tv starts of fine but with in 1 to 2 hours half of the scrren image starts breaking up and finally becomes vertical lines which keep changing colour. if i switch it off for 20 to 30 min it recovers for 30 min and then starts flickering again.
Probably caused by a power supply nearing its death.
Try to verify this by placing a portable fan to the side of the set with airflow directed at the vented sides.
If this lengthens the operating time, there is a good chance that some minor components in the main supply have developed low values of capacitance and higher losses which worsen with warmth.
Listen closely at the vents with the sound turned down to attempt to detect a squealing sound while the TV is in its failure mode; if you find this, it is also a sign of power supply trying to die.
A tech equipped with a capacitance meter that measures losses at the same time, could find and replace the weakened parts without a whole lot of labor and little cost for parts.
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