When I turn on the TV the sound is on but the screen is black except for a narrow horizontal line across the middle and you can see a tiny bit of the picture . All inputs have been checked and they are all good. My TV is only 14 months old. This problem started about 2 months ago but only did it occasionally. If I turned the TV off for a couple of minutes and then back on, it would work. Now that doesn't work at all. I had the cable company here to check it out and he said he thinks it's the picture tube. What do you think? I also called a TV repair service and he said this happens with a lot of Toshiba TV's
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The set has a shorted vertical output IC, probably
a TA8427k. The capacitors around the heat sink of this IC dry out and cause the IC to run hot. The correct repair is to replace the vertical output
and the electrolytic capacitors near it. Also use 105 centig instead of the original 85 centigrade.
The is some time a pico fuse or current limittng resistor which must also be replaced. This a common problem with Toshiba and is not a bad picture tube. The usual cost of this repair is
around $120-150 depending on the integrity of the technician. Scrivitron
I sorry but i tend to agree with the cable guy. It s not uncommon. If you see a dot on the screen or the Pic. is reduced to the center of the screen it is a hint that there is something wrong with the pic tube. Not necessary the pic tube but something along the lines. I would call Toshiba and find out about the warranties on there product. Good luck.
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The line is there because the vertical deflection unit - the one that spreads that line across the entire screen to form the image - has failed. Replacing it is a job for a professional, or at least an experienced amateur, and the parts will be quite difficult to find for such an old tv .
vertical output ic needs to be resoldered. careful leaving that bright line displayed on the screen as this will cause a permanent phosphor burn into the tube. this can not be corrected once burned unless you replace the tube. mch
I wouldn't attempt as the capacitors on a tv store around 25000 volts this is more than enough to kill you and they keep there charge even when the tv is off. Either take it to a repair shop or put that money towards buying a new tv - Do not even attempt to open the tv. (It sounds like maybe a tube has gone or the electromagnet that makes the beam move vertically is gone.
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!