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Thanks for using FixYa. The issue is with the convergence ICs going bad and needs to be replaced. It’s not a difficult job if you want to do this yourself, you should require some basic knowledge about soldering-resoldering components. To start with you’ll have to open the back of the unit and then replace the ICs(STK ICs) which are located behind the black heat sink and also check the resistors as if they are short the ICs might blow again after sometime. There are repair kits available which includes repair instructions with the parts, if you want to do it yourself you can buy and repair it yourself. Please do rate the solution if the issue is resolved or post a comment for further assistance.
STKs in your set should be on same board that has tuners on it board you connect cable too.If different model they will be on board to very right end STK ICs are big black chips Two of them together.will have part number on them.