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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
You will have to take this in for service. The possibilities for your symptom are numerous - it could be flyback if the audio voltage is derived from the wall ac; it could be CRT; it could be video blanking (to protect the TV).
A technician need to check voltages to provide a suggested repair.
Heres the fix for your set, replace the following 2 parts:
1) flyback transformer RCA part number 257805
2) horizontal output transistor RCA part number 237470
you must be proficient at soldering & un-soldering or you can`t replace these yourself, be advised that the anode lead coming from the top of the flyback transformer can carry a VERY NASTY shock if not discharged properly before trying to remove it from the picture tube, I`d strongly advise you to call a tech unless your familiar with this type of repair, BMW Rider