Hello. I have a two or three year old Sharp 32" TV. It has overheated on my twice now, which is strange for it's age. I finally noticed that everytime I touch the screen, the TV has static charge. I rub my hand on the front screen and it's just pure static. I don't know why it is like this, but I assume maybe during a move something got knocked loose and now it's not grounded properly. But it builds up a lot of static charge, attracts a lot of dust, and then overheats. I have taken it apart and cleaned it out, but I want to prevent this from happening again. Any suggestions?
Static on the front of the crt is normal, there is a 25-30 thousand volts around the bell of the tube, this extreme voltage will cause this. Even with the set turned off. Explain your problem better, because "overheats" does not tell me what is going on. Does it shut down? -- picture change in some way ? . If you are getting shocked of the glass, then maybe the dag ground came off, but you would have more extreme issues. The dag ground is a bare wire braded looped around the back of the tube, then connected to a ground point of some kind. - but unless you dis-connected this yourself, it should not be a problem.
Ok. Well, my roommate runs it pretty consistently, so it's on most of the time. After running for a while, it will normally flash a blue screen for a second. A few minutes later, it will shut off and it will not come back on no matter how many times I push the on/off button. It doesn't make a sound or do anything when I push the on/off button. So I take apart the inside and use compressed air to blow on the inside. It normally comes back after I blow on the light right behind the main screen, which leads me to believe it's overheating there.
I understand TVs are supposed to have lots of static, but I can tell you that this is an abnormal amount. I was seeing if there was a quick solution or if there is something actually wrong with my TV. I haven't actually been shocked off the glass, but I can feel the charge building.
From what you are saying you have a component (transistor, ic) that has become temp sensitive, or something has a bad connection, or a bad cap. - That is a really wide field because the details you are offering are not specific enough. Any blink codes?, If you tap on the chassis will it come back on?. This tv will need to be trouble-shot. If you think the tv is producing too much static, then maybe the high voltage is too high. There is only one way to know this, it is to use a high-voltage probe to see what it actually is. But i think that is the wrong direction to go. I think you need to be looking at things in the power supply or deflection circuits.
Well, I mean I don't have too much experience in the field, so I don't know. I was just looking to see if there was a simple solution or not. I also don't know a lot of the technical aspects, so I can't really get into it. I did try tapping the chassis and it didn't do anything. I don't know what you mean by blink codes, but I don't think there was anything like that. I am suspicious of the power supply though. I think my TV builds up a lot of static charge, attracts dust which causes the main fuse right behind the screen to overheat. I think this because everytime I use compressed air on that specific section, it comes back on. When it shuts off abruptly, it does absolutely nothing no matter what I press. I guess I am going to have to have a technician look at it though. Thank you for the help you could give me, despite what little I could give you.
You are right in that tv's power circuits do attract dust, but this is normal. Dust buildup has little adverse affect on a tv other than ventilation problems if vent holes get clogged. A main fuse overheating is wrong, a fuse simply blows, it does not over heat then begin to work again. If the fuse is blowing then something else is causing the fuse to blow, a fuse is protection device. so just replacing a fuse will usably never fix a problem. the fuse blows because of a problem somewhere else. It seems allot of people who post questions here don’t understand the purpose of a fuse.Anyone who reads this, remember a fuse reacts to a problem, it is never the problem it's self. And replacing the fuse with a higher rating is never a fix (unless in rare circumstances it is an engineering defect that the manufacturers have told us to increase the fuse amperage)