I used to be able to jiggle the cable connection and the picture would tune in, but now it's just a few horizontal lines with a partial picture that flickers in and out in one or two of them; screen is 2/3 blank
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Re: sound is fine, picture not
You have a vertical deflecttion chip that is going bad. Probably a LA7832. There is also a good chance that you have a leaky capacitor and bad zener diode. The capacitor is east to get , the zener diode part # is MTZJ75. These repairs are usually best left to a professional
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If it's a horizontal line across the face of the picture tube, your TV has a problem with its vertical output. Most likely, it's bad solder connections to the vertical output IC. Because this part gets very hot during normal operation, the connections to the circuit board can crack and the part quits working. All you see then is that narrow line across the tube. A few minutes with a soldering iron to repair the connections is usually all that's needed to fix the TV. It's also possible the part has truly failed, but the bad connections a much more common. A service shop could do the repair if you don't know anyone with the soldering skills.
The vertical output transistor, or a component in that circuit has gone out. Often an electrolytic capicator in this circuit will fail causing this problem. Sometimes you will have catastrophic failures which will take out the transistor, cap, and resistors in that circuit. But none are expensive parts really. But it takes an experienced hand to replace/test them.
well tuners are being made smaller (and there is more cold solder in some points due to heat) so i would look up a new tuner for that tv...and if you know how to solder ,do it yourself it will be cheaper
Sounds like you've got whats called a cold solder connection somewhere in the horizontal width control circuit or a connection in the sweep section. Should'nt be two expensive but unless you have had some soldering and troubleshooting experience I would leave this on to the pros. Good Luck