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Ur tv the convergence board the 2 STK convergence ICS and some or all it resistors are dead.These parts are defective still have some life left,it will causes colors lines like RED,GREEN,BLUE misaligns,colors shadows,3D picture.When the 2 STK covergence ICS are totally dead it make this cricket noises and burning smell.The shop cost u $300-350 for parts and labors.
This is very simple to repair if have burning parts smell,replaced parts that burning smell,the parts that cause by the burning smell part,make it to dies that hard to find.My sugestion replaced the DM power board,first to get power back,than go on from there.
Sounds like a CRT is arching internally. to confirm remove the covers to have a view of the picture tube necks- in adimly lit room you should see bue arching in one of the tubes. (there are three piture tube with glass necks)
Can you remove the rear panel and check if the hissing is coming from the flyback? Which is a large transformer with a large red wire coming from the top of it? If so can post a link where you can get a replacement their not exspensive and their easy to replace. If its not coming from the flyback post a picture of where the hissing is coming from and I will identify the parts for you, But I feel its the flyback due to the hissing. respond to this same post so I have your correct model number when you reply.
sounds like the flyback transformer is bad would need to change the supply module 6871VPM997D approx $175.00 or replacement of flyback T403 and part number 6174Z-6400B runs 49.27 but would require soldnering skills