First I had horizontal lines near the top of the screen for about one month. Now the image has collapsed to the bottom 1/10 of the screen or just a flickering line at the bottom. Audio also quit at the same time. I have some background in digital systems and circuit board design. Can this be fixed? I would guess a internal power supply toasted some IC's. If you would be willing to give me a hint, or even better, component identification or location I'm sure I can put humpty-dumpty together again. It would be greatly appreciated.
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This is what is known as frame collapse - which means there is no vertical deflection applied to the tube.
Please do not continue to watch the set in this condition as it may burn a horizontal line in the middle of the screen.
The most likely cause is either bad solder connections to or failure of the frame vertical output IC.
Please rate the assistance I have given - I hope it is useful. If you call a serviceman and tell him its frame collapse as this type of repair is not for amateurs - voltages in television receivers can kill.
Set starts, horizontal and vertical deflection work, HT ok, crt heaters ok, but no sound or picture
I turned the G2 voltage up and noticed a white screen with flyback
lines, frame ok. I detected two badly soldered double diode rectifiers
in the secondary part of the power supply ! I checked all other joints,
and everything was ok !! success
White horizontal line (no vertical deflection)
Check / replace R548, R549
Sound but no picture except for a couple of horizontal colour lines
Replaced the frame chip TDA8356, set now ok
the black bar is from the light tunnel collapsing. the white lines are from the colorwheel or the main board has a cold solder joint. replace the tunnel and colorwheel and have the main board looked at.
The several thin white lines at the top of the screen is the warning that the vertical output IC is not getting the boost voltage it needs to run correctly. The IC cannot operate for long like that and shorts out inside, which is when the vertical collapses altogether and you get the thin white line through the center of the screen. The good news for your son is that he had nothing to do with that, and it has nothing to do with the cable F connector. The set needs to be serviced by an experienced tech who will restore the boost supply and replace the vertical output IC, and when I do that I charge $75 but techs in your area will vary, so be sure to ask around.
Assuming this line is across the screen horizontally (side to side), this means the vertical deflection circuitry is dead. In late model sets, there is a Integrated circuit package which drives the vertical yoke coils. Possible defects: the I.C. itself, bad solder connections where it solders to the board, missing voltage source to this I.C. (often around +24 volts), or a bad electrolytic capacitor in the associated circuitry. This latter often results in a non-linear picture, or less than full deflection condition, rather than a thin line only.
It is possible lightning caused this problem, (I've seen some rather illogical damage from lightning ) perhaps it produced enough of a surge to pop the I.C. or a fusible resistor in that voltage source noted above.