Check the grounds around the 7 pin ic. [this is the vertical ic] located on a heat sink. Resolder these. The first reason they have rings is that you have two or three bad caps near this ic. Pay close attention to the 35volt 100mf cap in front of the ic. I cannot remember the location numbers now. Been sometime since I repaired this model. Then there are two 50volt 47mf that may be replaced. These are questionable, if you can find them they are very small but not surfacemounted. They are behind the ic. and you can replace . Always remember to correctly insert them with their polarity grounds.
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