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??? what does a power supply failure on a tv look like ???
none of the buttons light up , nothing lights up no bars or stripes on screen , nothing !! cord is plugged into a power outlet and is on , but nothing no lights no sound (sometimes a high pitch squeal is heard )
Aug 23, 2013 - Uploaded by ShopJimmy.com
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If this happens only when the guitar is plugged in, most likely there are two possibilities. The first, you have some issues with the electronics in the guitar OR are using an acoustic guitar witch has an extremely sensitive pickup that provides nothing but feedback. If this is happening with the guitar unplugged, there is a mountain of possibilities.
Try replacing the Drum Unit, this is a problem I have encountered many times as a service technician. most recently I had one that was at 89% remaining and every time the unit begins the print process it makes a high pitched squeal.
The high pitch sound to me may be coming from the speaker on the main circuit board. Try to unplug for a few minutes, reset clock time and then try again. If same issue, may need new PC board. When you say Microwave continues to run are you meaning the Turntable is turning and the fan running?? Or is it just timing down. Almost never does it actually keep heating. On GE units I mostly find bad door switches will cause a back feed and make the tray turn and the cooling fan for the mag to run. To see if that is the problem You have to look at the door switches behind the front panel on the left side and see if any of them have any browned connections on the terminals where they push ontl the back of the switch. That will cause the fan and turntable toi run, but wouldnt cause a high pitch squeal. These companies use switches wtih small 3/16 terminals that dont give a good enough grab on the switch, they get loose and hot and make the switch go bad. I replace that switch with a switch with 1/4 inch terminals and runa short section of Hi temp wite to it and it wont go bad again. Just cheaply made!! Also I guess the squeal could come from the turntable motor area. So By fixing the switch problem it could fix your squeal. With nothing else running you may be able to hear motor and coupling noise you couldnt hear before.
yes. its the horizontal linearity coil resonating. take off back. and while unit is on, take a plastic straw and push on coils in the high voltage area. you will find one that squeals when pushed on, or will stop squealing when pushed on. solder that coil and area. that will fix 80 percent of the time. if you push on it and the squeal tone changes, solder it and silicone it done. fixed.
the high pitch squeal indicates shorted component/s. the transformer goes hot co'z its being overloaded by the shorted component, it too could be the one creating the squeal!!
if you have experience with electronic troubleshooting, try to test some of the components particularly on the secondary part of the transformer. Be careful and make sure the TV set is unplugged. test for shorted diodes and transistors, if you're in doubt of your readings try to desoldering one leg of the diode then proceed with the testing/measuring. replace any of the bad components you find exactly with same part number or replacements with the same rating.
spend more time on it resoldering some other cold soldered components.