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The problem is in the vertical section of the TV. Usually one of the electrolytic caps has gone bad. Easy job if youre experienced with board level component replacement.
A shop should charge under $100 to fix.
the problem is vertical collapse,i am not so sure you can trouble shoot this on your own but you can send the board to eithor pts electronics or tristate module for repair
to get a price get the number off the sticker--left hand board(looking from the back) it will start CTC195---- write down entire number before you call them
this is normally caused by voltage on the coaxial cable which simply can be solve by a surge protector with a cable in and out.. but this is just a way to passify the issue. More than likely there is a bad ground either in your house or on the comcast line
I have sound but no picture. At first, there was picture but a lot of red lines running up and down as well as across. There were also two bars in the middle of the screen. I turned it off for a while and let it cool down but when I turned it on there was no sound at all. Do I need to have philips replace it? It's under warranty
Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages. Good Luck!