After the TV is on for a period of time, the picture becomes fuzzy and jumps around. I can turn the set off, and let it "cool down" and everything is back to normal, but eventually it will do it again. Is this common or do I have a unique problem?
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When something gets worse after it's been on a while, that always points to something overheating, such as a semi-conductor. When it cools down, it returns to normal.
Examination inside the unit might give a clue to the faulty part. Look around for the signs of heating. Also check any big capacitors for bulging tops or coloured stuff coming out of them.
Replacing boards is much cheaper than replacing the TV. The only way you would need to do that is if there was a screen problem. But as the picture is good for part of the time anyway it's OK.
Set has a bad vertical sweep IC. Also This Sanyo has a tendancy , when the IC blows out , to take the fusable resistor in the sweeo supply that feeds the vertical IC. This set should only be serviced by a trained technician because of ther high Voltage that lingers within. This repair should run you antwhere from 85.00 to 150 bucks. Good Luck