Did you check the main spindle motor? It's better to lubricate both ends bearings. Of course, a bottom hole is necessary. When this board is transplanted into working DCP-50/150 I am getting the same thing: blurry "eye-pattern" which fails to snap into focus. So the problem is with the board, and I have already recapped it. Weird... Did you clean the PCB underneath the leaking caps? It's necessary. will desolder that one leaking cap (red dot cap on the photo) tomorrow to check maybe I missed some damage. But yes, I clean board w/alcohol (my favorite step!), always ;-)
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