HP Capri motherboard - getting over power supply fan error. \ VOGONS

HP Capri motherboard - getting over power supply fan error.

Topic actions

First post, by Putas

Posted on 2022-05-09, 05:18

Putas Offline

Rank Oldbie

Rank: Oldbie
Posts: 1340
Joined: 2010-11-21, 06:58
Location: q3dm6

I had this serverish i815 motherboard with PIII-933 and now I would really like to use it. Trouble is, it expects the original PSU with fan connectors to report fan operation. And until the signal is there the mobo refuses to boot with error 0051-AE.
It looks exactly like https://h30434.www3.hp.com/t5/Desktop-Operati … 00/td-p/7664722, but simply capping it with jumper did not help.
Here https://community.hpe.com/t5/Operating-System … 29#.YniiZ1RBxEJ they suggest 100 ohm resistor is needed. But before I try that I thought let's ask here first. Surely somebody must have dealt with such troubles already.

Last edited by Putas on 2022-05-09, 16:51. Edited 1 time in total.

Reply 1 of 2, by SSTV2

Posted on 2022-05-09, 14:13

SSTV2 Offline

Rank Oldbie

Rank: Oldbie
Posts: 679
Joined: 2014-11-19, 20:30

Motherboard just expects a tacho signal there, you could route it from any other fan in the system through a 1-10k Ohm resistor or make a small oscillator board that would generate a low frequency square wave signal.

Reply 2 of 2, by Putas

Posted on 2022-05-16, 17:56

Putas Offline

Rank Oldbie

Rank: Oldbie
Posts: 1340
Joined: 2010-11-21, 06:58
Location: q3dm6

Thank you. 120-ohm resistor in between the CPU sense pin and the PSU pin did it.

Go to top of page Go to top of page

Back to General Old Hardware