Hi! I recently got an Enhanced IIe from someone who was getting rid of it and I've been trying to coax it back to life. I have had a II+ for years and, except for a power supply failure, it's been rock solid.
Anyway. the IIe had a blown power supply, so I tempoararily swapped in good (ReActiveMicro) one from my old Apple II+. On first powerup I get a blank screen with no beep. Turn it off and back on and I get random vertical lines. I say random because I can turn it off and on again and get another variation on those lines. Here's a picture:
Here is what I have tried so far:
1. Pulled 65C02 (338-6503) out of IIe and installed in II+. The CPU works in the II+
2. Swapped the DM74S02N at B8 with a new SN64S02N
3. Swapped the 74F109PC at C1 with a new SN74109N
4. Swapped the 74LS125APC at E1 with a new SN74LS125AN
5 Tried pulling CPU totally and seeing what happens. Still get the same random vertical lines!
Any ideas as to what's going on? I'm baffled!
Here's a picture of the board: