TV shows only a thin horizontal light whenever i turn it on
Please Help!!! My TV screen remains like it is still switched off whenever I switch it on, with the exception of a bright horizontal light across the middle of the screen. It started about a week ago. it wasn't that serious at first. once in a while the picture would shrink a bit towards the center( making the picture look wide) and become darker. Picture would also become a bit shaky. It usually returned to normal after a while or when I hit the TV.
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Re: TV shows only a thin horizontal light whenever i turn...
Since hitting the set "fixed" it initially, the problem may have been poor connections. At this point it is likely that the vertical IC is now defective. Since you have not posted a make and model, I can not give you specific details, but look for a small flat IC attached to a heat sink with about 11 pins. Try resoldering the pins first. If that fails replace the IC. It should be marked LA7837 or something similar. Feel free to post the marking here and I'll confirm you have the correct part.
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If its a horizontal line in the middle of the screen do not switch on the TV till you fix it. It means you have lost the vertical amplifier IC ( chip ). If you continue to turn on the TV the phosphor in area where the line is coming will get permanently burnt and do not look at the screen it can cause retina ( eye ) damage. Take professional help to replace the chip.
You have a vertical deflection problem. This is either caused by the vertical yoke transformer going bad or the vertical coupling capacitor going bad. It may even be one of the components in the biasing circuit that delivers the vertical deflection signal. In any event this may be causing excessive current which then causes the shutdown circuit to activate. I would have a qualified TV technician check the vertical defelection section of the TV.
A line on an LCD, either horizontal or vertical usually means the video driver board is defective or the screen is defective, does it show up as black even on a dark screen? That means a line of LCD "shutter"s is not working and there is a problem that cant be fixed by a reboot or channel change. Bummer.
My LG tv has suddenly got a problem with the picture. Whilst watching the tv with no problems at all,
the picture was suddenly reduced to a thin vertical line down the centre of the screen
and an awful smell seemed to come from the tv
There is a short ckt in your tv in horl. section.
1 isolate power from horizontal section.
2 check for normal output from power supply.
3 check parts in horl output section
a hor.output transistor
b diode & cap in h/output trnsformerckt.
c check for print.
d if all are ok check for eht transformer.
e if every thing becomes then reconnect hor output section supply.
f put on the set.
whenever you see horizontal line please reduce brightness of your tv for safety of crt.
your problem in vertical section only mostly due to loose contact in
connector,print or loose components.
this symptom, sometimes called the tube light effect, it is characterised by a bright thin horizontal line across the middle of the screen. this symptom is caused by a breakdown in the vertical deflection circuit. hence maybe the trouble maybe in the vertical oscillator, amplifier or output circuits. but if all i have said is not clear to you, better bring it to a qualified tv technician. good luck!
If you dont here anything then it sounds like the switching power supply or the horizontal output circuits not starting up. this requires troubleshooting with a variac, as well as maybe a scope. If your not trained to work on HI Voltage circuits you should seek assistance with this repair. Theres HI voltage inside these sets even after they are unplugged for a while. sorry i couldnt be of more assistance.