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It will be good to check the capacitor on the +B voltage that goes to the power section in the main board. A filter capacitor of about 47mF/160 V can be defective.
Next check the capacitor on the HT line to the grid-22mf/250V replace.
If possible loop on capacitors in the horizontal section particulary the IC.
Now the tip I can offer:
If the fault occurs on heating shcek out htis area to confirm and isolate the component.
But finally I understand that when you press any key the picture is good.If so check the memory IC/cmos IC in this section for logic control, it might be having a switching fault, a conflict or the video noise is coming on in default but goes off in the data selection mode. Do a soldering around this section on the IC , capacitor and see if the fault goes off or becomes irregular when this section is heated, if so there is a semiconductor producing this noise error .
So start from the begining so that we have a clean voltage inside.
I hope my advice helps.
that is a capacitor arround 47 micro farads 25 volts or 2.2 /3./4.3 micro, replaced with 35 volts
in vertical circuit amp that is a 30 minutes job for a good tech
hope that will help you
have a nice day
Is it still under warranty? If not I would find a good TV Service Shop and have them check out the power supply as there more than likely a 'Capacitor' much like a battery that is going bad. Blessings, A/V Media Guy
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.
Sounds like something is getting hot causing voltage loss or drive pulse loss to the vertical IC. Maybe you have a bad solder joint. Try tapping the circuit board around the vertical section. A capacitor could be heating and opening up.
Also you might try using circuit cooler spray and make the problem show up.
One thing you should not do with electronic devices which have a start up proceedure is to turn the power off, and then on again without a wait of about five minutes.
Some equipment manuals warn you about this, and specify a longer period.
The start-up has to have time to reset.
It will be more likely to reset if you do not leave it on standby,
and even unplug it.
In your TVs case you need to describe the distorted picture as it may give a clue to a fault, or incorrect start-up.
The horizontal line indicates the frame timebase had stopped working.
No picture could be a fuse blown inside the set, or a timed cutout which may reset after a time.
Try after several hours to see if it comes on.
If it is just the frame timebase (vertical) it is worth repairing.