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hi if only a horizontal line across with no video anymore, you have bad either vertical ic or no dc supply b+( vertical ic ) or no output dc coming from the ic. if it is not totally a horizontal white line and you can see a video you must check leak or bulged capacitors at the vertical section near the vertical ic. hope this can help good luck.
You will have to inspect the pins of the vertical IC. They may need resoldered. And you may have to replace some of the capacitors in the immediate area of this IC. If you still have a vertical problem you may have to replace the vertical IC.And please check the diodes near this IC, rare but occasionally they will short out.
This is an easy repair if you've ever soldered and would not be too costly for a repair shop to do it for you. The problem is a bad Vertical Output IC (usually mounted on an aluminum heat sink with the part on it labeled LA78?? ) and 1 or 2 bad capacitors. Some times you can even fix the problem by re-soldering the contacts of the IC- To find the IC follow the 4 wires that come from the Yoke (which is a contained coil of wires slipped over the neck of the picture tube(s)) back to the board. 2 of the wires go to the horizontal o/p and 2 to the Vertical o/p the thinner gauge wires are for the vertical.
If you were able to tap on the set to get it working, then it means that the solder joints on the vertical output IC are cracked and loose. This is very common on those sets. Now, the pins of the IC could be so loose that they just wont work anymore, and simply resoldering the pins of the IC will cure your problem. However, it could also be that the loose pins have caused the IC to short out inside, in which case the IC will have to be replaced and most likely a small resistor in its power supply too. If you do not have experience working on things like that in TV sets, allow a qualified tech to handle it for you.
If you have a picture but the top is folded over, your vertical IC is probably good and you need to replace the pump-up capacitor next to the IC. When the pump-up cap (typically a 47 or 100uF 35V cap) is open then the picture will have white lines and foldover at the top. The typical vertical output IC is the LA7838, but I am not familiar with exactly which output IC your set uses.