Re: New member with early HP computers
On 2019-08-25 1:50 p.m., silverray.russia@... wrote:
Does the PVAL signal from the power supply go high? If it remains low the processor will be held reset.
What was the fault on the power supply? Some failure modes can result in higher than normal voltages going to components in the system, for instance I had one that to +5V pass transistor failed short putting about +25V on the +5 line.
Do you have any instruments like an oscilloscope or a logic analyzer you can use to troubleshoot? If all you have is a meter troubleshooting may be difficult.
I would second what Craig said, I would clean the edge connectors
and reseat them a couple time to make sure they are ok. I had one
that would not start up until I cleaned the edge connector even
though there was no visible contamination.