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Likely you have a partial failure of the power board in your TV. If you hear sound, this means that your tuner circuit is running ok, but the picture power has failed. Check the power board for any blown capacitors or other components.
Tries pushes the power switch on the remote few times,each times push wait like a 1 mins or 2 mins for the tv Tuner signal board to take it effect.This process should get ur tv picture back,because the tv Tuner signal board it is old and having problems,evenually require replacement of a refurbish tv Tuner signal board.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish tv Tuner signal board for the replacement.
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.