I have a Sony FD Trinitron Wega, model #kv-36fv16 and it just recently started squealing. After about 5-6 hours of continuous operation it starts this high pitch noise, so I muted the tv to see if it was the station but not that lucky. Is the tube going out and if so, is it worth spending the money to have it repaired?
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WARNING- VOLTAGES STORED INSIDE YOUR TV CAN KILL YOU EVEN AFTER ITS BEEN UNPLUGGED FOR DAYS..your problem is in the zero cross detect circuit . youu should take it to a repair facility. -Or replace diode D647 . Or on remote in this order press "display -5- vol down - pwr ." and then you could watch it right now ..kinda
The high pitch squeal you hear is usually caused by a coil vibrating, normally in the horizontal circuit. I've also seen the ferrite bead on the horizontal output transistor do this, but, it is rare.
I normally will repair this by finding the coil and "tightening" it.
To tighten a coil, technicians use different chemicals, such as, a hot glue gun, rubber silicone or even finger nail polish.
I will find the coil that screams by starting with the usual suspects and using a wooden dowel, barely touch the coil and if the pitch of the noise changes, then, thats the coil that needs repaired.
If you do not know your way around the inside of a television, I never recommend you do so, since, this procedure must be done with the set turned on and you poke your hands around the inside of the set by the high voltage circuit.
Hope this helps your decision.