Super high pitch whistle from tv, only powering it off helps.
My tv is 13 years old, picture is still fine, but a super high pitch whistle comes from it. turning it on and off sometimes will help for a short while. its a 36" sony wega- 300 lbs monster to transport.
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Ur tv the high voltage it dead,the FBT,the flyback transformer.The big black block of plastic with a red wire with a black cap that hook up to the CRT(tv tube) is dead.The FBT,flyback transformer needed it to be replaced to solved this problems.Call the shops,take estimates for the best deal to do the repair.This is one of the main part of the tv to put HV in CRT(tube tv).It pretty hard to find this FBT these day,because of the discontinue of making of Amalog tvs.
It's not the picture tube(especially if image was good b4 it went dead). The high pitch noise is the power supply whinning because it's shorted or overloaded. I just fixed one of these sets - replaced the horiz. o/p transistor and flyback estimate around $120.00-$160.00
Does the squeal come from the TV cabinet or the speaker? If from the cabinet , it's most likely the Horizontal high-voltage section of the set. Find someone that's good with hand tools,unplug the set from the wall outlet, let it sit for a good 30 minutes. have someone open up the back of the set and dust out and vacuum out any dust from inside the set. Put back together and try it out.
It sounds like the high voltage circuit got damp and arced. This arc caused the horizontal output transistor to short.
You might try replacing the output transistor if you're experienced in this type of repair. If not then you need to take it to a repair shop.
The "whistle " you're hearing is the power supply indicating that it has a short on its load. When the power supply has an over load (short) its frequency drops down when your ear can hear it oscillating. This type of power supply is a switching power supply normally operating a several thousand hz(cycles) which is out of range of human hearing.
I think its the flyback and its starting to leak. this is a component responsible for the high voltage of your tv set. always observe safety in dealing with this. Have it check by a qualified technician. Good luck!
I wonder if there is enough air circulating around your equipment??
My DVD recorder makes a sound unless I open
the doors on the cabinet that contains all of my equipment.
The cable company says it is a fan to cool down the units.