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This is usually a bad elect capasitor or a bad solder connection on the vertical IC, The capasitors will be close to the vert chip..Sometimes you can clear problem with a light tap on the TV, if so then suspect bad solder.
I would suggest to locate a part that looks like the one on this link and re solder all the pins, also check for any high power resistor nearby the IC295890 and put some fresh solder.
Let me know if you need further assistance.
The vertical output IC LA7847 is failing. It will likely fail permanately and you will have just the horizontal line. The set will require service. Just do not run the set very long in this state. That thin white line can likely burn into the crt phospher and will show all the time thus ruining the glass picture tube...
hi there, you do have a vertical section problem and at the power supply section problem. do some test, check for some cold solder at the power supply section, test some electrolytic capacitor at the vertical section. ty
If you can hit it, it is probabl;y just bad solder joints on the vertilcal output IC (yes thats right vertical, because it stretches,or in your case compresses the picture vertically). kind of hard to point you to it if you've never been in a tv but it will be a little chip standing up mounted onto a piece of metal (heat sinc). There will be a few though the IC will likely have 1 row of pins maybe 7-10. And probably have a part number on it that begins with "LA" like maybe LA7838. You can tap around the different heat syncs with a NON-METALIC with the TV on until you find the one that is sensitive that should help you identify the vertical IC. Any way unplu flip the PCB over and resolder that IC. That should take care of it.
Open the TV amd turn it on in a position you can see the picture, possibly through a mirror. Now gently tap all of the metal heat sinks on the circuit board until you find the one that is sensitive it will have a small chip mounted vertically on it, with probably like 7-10 pins. The number on the chip will most likely be an "LA****" number. Now turn the circuit board (UNPLUG FIRST) over and resolder the pins. This is your problem 99% of the time. Be very careful there is High Voltage inside this TV.