I've solved my first problem on this Apple II Europlus i'm trying to repair ; it used to have a 14Mhz clock (!)
Changing a 74S in the clock generatin made it 1Mhz again, it tok a while to figure to right one as this was not the most obvious one (linked to phase 0) but another one, the 4 bit counter.
NOw I have some (pal) video output ; garbage. :( I've read all topics on this forum about this kind of issue before posting :) Some points to broken links, which does not help.
My display shows a pattern of blocks of vertical lines, looking a bit like 7 position dip switches one next to the other
I get the exact same pattern if I remove the CPU
So something is very wrong ; basically the PAL generation works, but the CPU doesn't even start or cares.
I cleaned the whole motherboard, reseated multiple times all I could think of.
I'm not much experienced in Apple repairs, and would appreciate some pointers about where to sart in such case
I do have an electronics lab so I can make measures if needed.