I have a 1991 Sharp Linytron 25 inch color tv with a beautiful picture when it is not fluttering or going completely black with small lines through. Sometimes it goes bad after watching a perfect picture for 3 or more hours and the next time when you turn it on, it is already fluttering. Any suggestions?
The vertical output IC Has cold solder connections.
Or the set has bad vertical shaper capacitor or the b+ cap. off the sweep power supply is defective.