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Re: loud electrical sound in rear of set(tv)
Sounds like the High voltage is leaking out and arching somewhere. Have a look in the back and see where it is BUT be CAREFULL!! This is enough voltage to cause serioud harm to you. If you have no TV repair experience, this is not the repair to start experiementing with. Play it safe and call out a pro to assist you. Good Luck.
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this might be a noisy color wheel . this is a motorized wheel that produces the color in the set. it could be something else because of your statement of picture is ok. if it the color wheel the set will eventally shut down. this part used to be avalible and fairly easy to replace. it has got harder to locate. The other possibilites includes a small leaky capacitor in the powers supply but that is more like a whine. a tech would have to take the back off and locate the noise.. i believe this unit might have 2 fans and a color wheel. three moving motors.. anything that moves eventally dosnt
Your description sounds like one or both of the rear drum supports (rollers) is bad. A quiet thumping is almost always present as the weld in the drum comes in contact with the drum supports. A binding support will squeal, and the thumping could be worse at that time. After running the dryer until the noises are present, once disassembled, you can tell if a support is bunding or rolling normally by spinning it by hand. The same goes for the idler pulley. Make sure power is disconnected from the unit befor attempting any repairs.
While the unit is disassembled for repair, make sure your your old cat is not inside.
The 23" CRT set may have a high voltage breakdown in the flyback transformer or focus divider. Take the back off and operate the set in a dark room. Look for anything that has a blue glow around it or sparks flying when the pop occurs. I won't guarantee this will find your problem, but it is definitive if you see these!
I once had a set with these symptoms. I stopped the blue glow and arcing by covering the focus divider with epoxy. It worked for a couple of months before the divider literally broke apart.
The noise in question relates to capacitors, which are (unfortunately) largely dependant upon environmental elements. You most probably find that when outdoors is wet and humid, there is no issue, but the moment the sun is out and it drys out, your problem rears its ugly head again. This is a basic fault and should be able to be solved by a standard TV tech shop, as its in short, humidity dependant. To explain caps, are moisture based electric storage devices; under normal circumstances the chemicals react ideally to provide the expected volts and or current. Alter the environment subastantially and the cheaper versions will not adapt and they will put the unit 'out of spec' as a dryer environment will produce less volts/current and more humid environment will make it perform closer to spec. Its a sod of a feature but thats earth. :) Higer class ie Class 'A' components tend not to suffer dramatic changes and produce more reliable results.
To sum up, the loud humming is caused by out of spec components or for that matter dried up used up components, the fact it runs for hours at a time is most likely weather dependant and if not its likely to be a dry joint somewhere on the board. These are also unfortunately largely dependant upon environmental conditions. Best of luck. :o)