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Try wiggling it the video cable. I have a TV with a messed up video plug-in from pulling cords off it, and when we wiggle it then the screen will flicker the image and we keep wiggling it till the picture stays on the TV screen.
I am having this exact same problem with this same model. The problem is intermittent and the screen issues are only on the top 25% of the screen. Please help.
as a general rule, vertical faults can be divided into two types: ones that cause geometric distortion (a circle will not be round) and those that simply black out a portion of the screen. the former are faults in the vertical oscillator, drive, or output stages. the latter are blanking faults. blanking faults are almost always caused by electrolytic capacitors changing value and thereby changing the timing of the pulses which blank the screen during vertical retrace. In other words, the pulses are turning off the video signals at the wrong time.
the most common true vertical fault is geometric distortion and a foldover of white lines at the top of the screen. this is almost always caused by the electrolytic capacitor on or near the collector of the vertical output transistor or part of the IC which has the supply voltage (B+) on it. In the old tube days, the general rule was that bottom distortion was in the cathode of the output tube and distortion at the top was caused by a fault in the drive circuit. this may help the solution!!
right click on your desktop... select properties.... when that window opens ... click on the tab that says settings. you will see a sliding adjustment there with different screen sizes.... experiment abit till you get the screen size that looks right and that you are comfortable with.
This is due to vertical section failure. Change the vertical supply rectifier diode and supply filters. Then check zener diode leakage in pumpup circuit section. Also check any electrolytic capacitors leakage in vertical section. If it is old model tv change vertical height, vertical lenearity presets also. I hope given details useful to you.
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