Hello! I recently purchased a A4000 for WAY too much $$. Well, it will not boot. I am handy with a soldering iron and have a smd rework table. So, this is a list of things I have done. Any help is mucho appreciated!
A3640 rev 3.1
2Mb CHIP / 16MB FAST
Steps taken:
Installed DiagROMS.
Socketed and Replaced both CIA chips and the PAULA chip.
Replaced U177, U354, and U178.
Cleaned up the battery area and checked all traces. All traces check fine in this area except pin 9 of U177. Added a single bodge from pin 9 of U177 to the end of the trace at the side of RP176. Tested continuity.
I have checked all pins for continuity on the CIA's and PAULA. All connections appear fine through the sockets.
Voltages look fine from the PS.
Unit will only boot with the diag roms. Every test passes except for the even CIA. It appears that my even CIA is not being clocked properly. The PAULA chip also gets a bit warm while the rest of the board is relatively cool. I have not re-capped this board yet.
Any Ideas??