My tv is not working please help.?

The sound is ok but the picture blinks on and off. Sometimes it goes out and all that is there is a faint blue and green line across the middle. Wometimes if u hit the back it will blink and then go on as normal. Its a Panisonic, rear projection tv . about 30 inch screen(not sure).
what could be wrong? please help

Answer:
It would be unusual for a CRT TV to lose deflection on all three CRTs Based on the symptoms, I would make the assumption that the problem is in the power supply and not for an amateur to attempt repair. the voltages in a TV can exceed 20,000 Volts .

Recommend a Power strip with a connected equipment warranty. should cost $50-$100 US once you have the TV fixed.
Faint blue and green line in Picture eh?

Sounds like you've lost the Vertical Deflection...that would make a line from the left to the right side.and banging on the cabinet indicates loose solder connections on the Vertical or the Vertical's power supply..

Look around IC 400 and 500 series.that's normally the Vertical and Horizontal sections of the TV, then look at the resistors and diodes around the High Voltage transformer too...OF COURSE WITH THE TV UNPLUGGED..
The fault is caused by bad soldered joints on the vertical chip ! very common , just needs resoldering . I have done hundreds like this, well ok then ! dozens !!Cheers Pete

Flap no Are you going to correct the first sentence of your answer ? you have it **** about face ! Or just insert a " not " after it would !

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