Sony KP-53S25- intermitant green and red, constant blue crt

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The whole problem here is that many (if not most of posts) are from people with little if any knowledge of a proper diagnosis, repair methods, etc- this is why a qualified repairer goes thru many years of training - the optimism of most posters that they can fix complicated machines by simple means is wrong(oh, the fuse is blown- I,ll put a bit of fence wire in)!!!. ETC<ETC,ETC>.