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05-22-2021 11:35 PM - edited 05-22-2021 11:46 PM
I recently killed my HP z640 when I shorted the 5V line of an Arduino board connected to the z640 via a USB 3.0 port (detailed in an earlier post). Following the steps in the Solving minor problems section of the Maintenance and Service Guide, it seems I will need to replace the system board:
With the PSU plugged in, but not connected to anything, I also checked the voltages on the various PSU connectors. I was most interested in the values registered on the P1 connector (labeled M1 on the PSU itself). The following are the readings I got:
-12V +5V N/C +12V +12V +12V +12V 0V +12V
0V +2.2mV 12V 0V 0V 0V 0V 0V +12V
Although I was able to find information on the internet specifying the PSU connector pin layouts for several other HP models, I wasn't able to find a pinout diagram for the z640's P1 connector. Some of the other models were close to these values, but always had a couple more +5V pins (and less +12V pins). Might someone know where I might find the correct voltage values for the z640's P1 connector? I'd like to verify if the PSU is operating correctly or not (i.e. will I need to replace it as well as the system board). Thanks.
05-26-2021 12:09 AM
please read the z640 "SERVICE MANUAL" on how to use the power supplies "BIST" mode to see if supply is functional
- Unplug the AC power.
- Remove the power supply.
- Plug in AC power and verify the following:
- If the green BIST LED on the rear of the workstation is illuminated and the fan is spinning, the power supply is functional.
- If the green BIST LED is not illuminated or the fan is not spinning, replace the power supply.
05-26-2021 07:06 AM - edited 05-26-2021 07:07 AM
...and if it fails the BIST there are 5 right now on eBay for about 35.00 USD with free shipping, USA site. I've never hesitated to install a used HP power supply bought this way, and never have had a used one fail thereafter.
05-30-2021 01:00 PM
Sorry, I just saw your reply today (5/30). I did read this manual and using the BIST mode determined the PSU was probably OK. I rolled the dice and only replaced the motherboard and fortunately that seems to have resolved my issue. I was just hoping to find the pinouts documented for the z640 PSU (as I found for other HP workstations) so as to confirm it was providing the correct voltages. I appreciate all the help you have provided.
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