My mac classic ii I recently got when I turned it on it would have a wavy screen pattern and after that, I recapped all Capacitors analog and logic. I tested logic on the working mac analog and the logic board works fine. I have also replaced all ic chips on the analog board after all this and still get the wavy pattern and my 5-volt and 12-volt rails are 4.3v and 11.03v with hard drive and floppy disconnected. I know diodes, transistors, etc can go bad and are there certain ones that can go bad?