Hi,
I have experience with the Compact Mac range so IIe's are a new venture for me. I have two both enhanced, I have had one for a years and it works fine, I have just acquired another which has been in a cupboard for about 30 years.
I decided to recap the power supply before turning on. Following the recap when I turned it on it powered on for a few seconds (led lit) and the floppy made a noise and then nothing, led went out.
Upon further troubleshooting I have found the following and would appreciate any thoughts re where to look next :
1. Power coming out of power plug is 12.2 and 5.3v.
2. I have checked continuity between J20 and J14 for the power rails - all have continuity.
3. The motherboard looks perfect.
4. When I have the motherboard out of the case and apply the power source, the readings on the back of J14 and J20 only read 0.6v for the 12v rail and 0.05v for the 5v rail.
5. I have tried the motherboard with 2 power supplies with the same result.
What would be causing the power drain on the motherboard like this compared to the 12.2 and 5.3 on the power plug when not connected to the motherboard.
Any help greatly appreciated.
I have experience with the Compact Mac range so IIe's are a new venture for me. I have two both enhanced, I have had one for a years and it works fine, I have just acquired another which has been in a cupboard for about 30 years.
I decided to recap the power supply before turning on. Following the recap when I turned it on it powered on for a few seconds (led lit) and the floppy made a noise and then nothing, led went out.
Upon further troubleshooting I have found the following and would appreciate any thoughts re where to look next :
1. Power coming out of power plug is 12.2 and 5.3v.
2. I have checked continuity between J20 and J14 for the power rails - all have continuity.
3. The motherboard looks perfect.
4. When I have the motherboard out of the case and apply the power source, the readings on the back of J14 and J20 only read 0.6v for the 12v rail and 0.05v for the 5v rail.
5. I have tried the motherboard with 2 power supplies with the same result.
What would be causing the power drain on the motherboard like this compared to the 12.2 and 5.3 on the power plug when not connected to the motherboard.
Any help greatly appreciated.