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Re: POP and noothiing
Yes it can still be fixed! the pop sound you've heard maybe came from a blown capacitor in the vertical deflection circuits. 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!
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Hello; This is an older 27 " CRT set that has no vertical sweep. This is likely caused by a bad vertical output IC or cracked solder connections on it. It can also be caused by bad capacitors or other components. Some of these sets have an internal "service switch" to set CRT beam currents. If someone has had the set apart and set the switch in the service position, you will get the one H line. Just put back to normal and pix will be back. John
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.
If it's old, it's most likely reached the end of it's working life. Some older sets had a 'service' switch for repairmen, when the switch was thrown it would produce the same effect as you describe.I wouldn't really call this a solution, but get a new one.
sounds like you have feild colapse.take off the back and on the ciruit look for the horizontal and when you get it sue a screw driver and a mirror. put the mirror in front of the tv once you locate the horizontal plug the tv back on and look at the mirror and as soon as you turn the horizontal you will see the picture come back up to the correct size, if no good???? take it out and get a new one if you look on the side off the component you must get tthe same for safety, solder the new component in and try again
This is very likely not the picture tube. I suspect that something in the vertical oscillator section has gone bad. You will need to get the schematics for this set. Locate the vertical section and look at the transistors and IC's to see if they are still good. Also check for bad solder joints and open resistors. You can do all the checking with a simple Digital Volt Meter. You can get all the info you need online for how to test transistors, diodes, electrolytic capacitors and resistors. Most of my TV fixes have involved bad solder joints that have gone bad after years of hot/cold cycles , usually under a component that gets hot (heat sync) , resistor, or heavy item such as a transformer. The other issues are usually with transistors or IC's that have gone bad due to power surges or age degradation. Sometimes fuseable resistors open open. Sorry I can't be more specific. There are too many things to check. Could also be a power supply issue. but highly unlikely if you still have a center line. TV tubes hardly ever go bad unless the set is very old.
Check capicitor in vertical hold circuit. You should have solid knowledge of electronics repair before attemping repair. TV's can emmit harmful radiation, and produce voltages up to or in excess of 30kV.