There is a really bad static and ringing noise coming from the back of the tv. this only happens when the tv has been on for about 20 min. if we put a heavy book on the back it stops for a while. whats wrong and should we buy a new one? thanks
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Re: stating and ring from back of tv
This is a common problem as I have stated in many of post here before with inexspensive TV sets. Whats happing here is a "singing" coil. it could be a small coil on the pc board or could even be the flyback transformer or maybe even the switching power supply transformer or could as well be a choke coil in the power supply. Not much a consumer can do really at this poit as there are no serviceable parts inside of this set BUT I think what your doing with heavy book is a really cool thing as whats its doing is flexing the printed curcuit board so your problem in this case i would think would be a small coil on the PCB. But as I said not much you should do about it unless your a quilified technician Sorry to say man but if it really gets to be an anoyence then I would take it to your local repair shop for an estimate(but you know problems like this dont show up at the repair shop when you take them in!) It shouldnt be a big deal unless it turns out that thye flyback transformers the problem!!! Good Luck
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That siren noise might be coming fom your horizontal output trnasformer. The sound is caused by the arching of electricity from one exposed conductor (wire) to another. This could indicate a bad transformer (shorted winding). A good test for this would be a RING Test this allows you to see if there are shorted windings in a coil. There are numerous pieces of equipment which allow you to do a safe RING Test two of the are : The LC103 Inductance and Capcitance Analyzer and the VA62A Universal Video Analyzer. These have an output for a RING Test. Now if you are adventureous you can build a ring test jig by using a capacitor a pluse generator and tow connection terminals. There are a lot of articals on the net about the procedure. Or what you can do is to take the set to a TV repair shop and let them worry about all of this stuff, the shop should have the equipment to test the Horizontal Output Transformer.
First, lets get rid of the static. Try Feature #86. This will turn off background music. When a music source is not attached you get static.
Enter programming by using Feature XXX66344 password 266344. The display should show "Terminals&Sets" press the top right button with an indicator in the display. The display should show "Show set: ____ enter the extension number that you want to check or program. The display will show ***:name. Press the top right button three times. The display will show Show Line:____ with options to Scan or List. If you select Scan it will show the lines assigned to that phone. If you select List it will start with the first line in your phone system showing one of four states 1- Unassigned, 2- Ring Only, 3- Appear&Ring, 4- Appear only. Change the selection on the line by using the CHNG soft button. This is where line assignments are changed from the four states for each extension.
The only other thing that will keep an extension from ringing is "Do Not Disturb" or DND. Feature 85 and #85 will turn this feature on and Off.
Sounds like a bad, loose or dirty connection. it's possible that there may be a broken soldered joint on the antenna connector. Open up( power off first) and resolder the joints as they can breakdown over time(dry joint).
This noise is coming from the power supply. You may want to look for a local repair shop from this website to get service if desired. If the power supply were to be replaced, it could be done by you if you are somewhat savvy.