Added a note to 5)krzysiobal wrote: 1) IC25.12 == IC28.11 --- No
2) IC25.13 == R3.2 --- Assuming R3 is the one on the back? No. The traces under IC25 are super confusing. But I found it was (at least) going to CART1.32. IC25.4 also goes to CART1.32.
3) IC25.11 == IC1.13 --- No, IC25.13 to IC1.13
4) IC25.11 == IC1.1 --- No, IC1.1 connected to 25.13
5) IC25.11 == IC2.10 --- No, 25.11 to IC1.2
6) IC1.6 == IC15.5 --- Yes
7) IC1.6 == IC28.9 --- Yes
8) IC6.9 == IC4.9 --- Yes
9) IC1.9 == IC6.10 --- Yes
10) IC5.10 - does connect to any of IC25 pins? --- IC25.12
11) IC1.12 - any other pins it connect to? I see a trace connected under the chip but I can't manage to find where it's going. Checked a lot of possibilities and nothing…
12) IC1.2 - any other pins it connect to? --- Yes. Connected to tiny vertical trace on the back (between IC1 and IC5, under the IC then gets lost under IC28.
Fixed error in 4)
While checking your wiring of the back, why did you connect IC3.5? the trace is cut.