TV goes black at bottom and has horizonal lines in middle?
I have a Sony Trinitron several years old. Turned it on and the screen went black at bottom and had lines in the middle of screen. then it would go completly black and I can turn it off and the picture will come back on. When it does this again I can tap the side of it and the picture will be normal. I have to do this several times and so far as long if I don't turn it off it works finefor the day. I took the back off and I noticed when I barely touched the wire going to the flyback it would work normal. so i turned it off and pushed down on the wire and I felt it click when I turned it on it worked normal till the next day & it started again. Talked to the guy at the TV shop he said that was not my problem that it was when I moved the wire to the flyback that I was moving the circuit board. He said I had a bad connection on the board from the horizontal chip. Before I take it apart and start checking sodier joints has anybody got any suggestions. Thanks
Pulled the board out and checked the solder joints and found that one of the legs on the horizontal output transistor had never been soldered. found another one on the board that was not solderd. made the repair & wiggled the board. The TV works great. Thanks for your help......BILLPulled the board out and checked the solder joints and found that one of the legs on the horizontal output transistor had never been soldered. found another one on the board that was not solderd. made the repair & wiggled the board. The TV works great. Thanks for your help......BILL
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Re:
Hello,
please check the high current area around flyback transformer, horizontal output transistor as well as the deflection connector for bad soldering.
Best regards,
Arpi
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I have same problem, over 10 years old, only started when turned on, but does it @ anytime now . any solutions ? and this thing does weigh a ton. never had a problem ever, great tv, great picture, etc., anytime a function is initiated screen blinks on off at will, stays on for the most part, no other problem, but can this be repaired or is it time to buy a new tv ?
no ....the tube will end up after 20 yrs in 10 yr old sony... it is worth if u fix it. randomly going black means...horizontal driver trans former is the problem..or any loose contact with the 110 volt supply to that transformer,,or any loose contact with line o/p transformer.. (horizontal driver transformer may be gone then tv behaves like this) if any other parts gone tv wont come back.... there may be a loose contact call a service pro..
2 things that will cause that vertical IC or Yoke! Listen to this one went on service call 2wks ago Customer had a 50 INCH1988 pioneer big screen replaced 3 capacitors resolder poor connections TV is now working like New ?
Make sure the TEXT and CAPTION options are turned off.
I am not sure about the Sonny's, but on my Toshiba a black box appears when I inadvertently leave one of the close captioning (CC) on for text or captions on (such as CC1, CC2, etc.).
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.
Pulled the board out and checked the solder joints and found that one of the legs on the horizontal output transistor had never been soldered. found another one on the board that was not solderd. made the repair & wiggled the board. The TV works great. Thanks for your help......BILL
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