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Re: Panasonic TX-29AD2DPM Serial no LE-7511621
No Colin, Its not the Tube. The problem is a vertical sweep falure. it could be just a driver/output IC or could also have a problem In the sweep power supply where The voltage that supplys the B+ going to the vertical IC could also be defective. Its not a repair a user should attempt to do as it's soldered into place and you can get hurt if not experienced with these types of TV repairs. As to the cost It depense on how much you like the set and if you can find an honest repair person to do an honest job? Good Luck
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The screen voltage to the picture tube is more than normal. Adjust it by the help of screen pot-meter integrated with Line Output Transformer. Visit the site named 'Electro-help' for more details. Check this link and select the site named above. View it in
'Flip card' option, which can be selected from the drop down box menu at
the left top corner or the display window. It will make search easy.
If this is a picture tube set (not a thin screen), then you have a bad electrolytic capacitor in the vertical circuit. Just about all picture tube sets that I've worked on that get lines at the top was caused by a bad or leaky cap and is a common problem w/ most sets. There's a very slim chance it could be the vertical ic but normally when it goes bad you will have nothing but a thin white line running across the center of the screen from left to right. If it's just a capacitor, the part would only cost a couple of dollars at most, however there's no way I can tell you exactly which one to change w/ out looking in the set. A repair shop would probably get between $30-$50 to fix it. If you can give me the model number of the tv, I can see if I can you some more info.
I can't tell you how to fix this set, but I can tell you that its not a "lamp" issue as this doesn't have a lamp. Its a 3 picture tube projection TV. the three tubes are in a red green blue format, and average about $175 for each one, not including the labor to install them. your problem, may not be the tube, but just a power supply problem, but there is a chance it is.
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.
Vertical defection failure. Common failure. Pretty easy to
repair ($50-75?). However, my general rule of thumb is not to
waste any more money on TVs over 10 years old. Too much other
stuff in there ready to fail as well.
It is not a bulb. It is a picture tube. If there are thin blue lines across the entire screen, not just the edges, and the picture itself looks too blue, it means that the blue picture tube is being driven too hard. This could be because the blue screen voltage is too high, the boost voltage on the blue picture tube is too low, or the video output is leaky or shorted. If the picture has what looks like blue arcs and double images on one or more sides of the picture, it means that one of your convergence IC's has burned out and needs to be replaced. These are things that should be tested and serviced by a qualified tech, so allow an experienced tech to handle it for you.
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!