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03-07-2021 05:25 AM - edited 03-07-2021 05:25 AM
Is there a way I can swap out just the memory cooling fan that is part of the HP Z620 2nd CPU riser? On one of my systems, this fan either spins with a high-pitched screeching noise or gets stuck trying to turn at bootup. It will attempt to turn a few times, then eventually will start turning with the annoying high-pitched sound again. All the other fans in this system are quiet and I have the idle fan speed set to minimum in the BIOS. I've tested putting a populated riser from another system into this one and it's fan operates silently.
On the underside, this has embossed writing "HP RISER TRAY ASSEMBLY PN 653907-002 REV B"
03-07-2021 07:32 AM - edited 03-07-2021 08:15 AM
That is the memory cooling fan for the riser. It did not need to change for the update from Z620 to Z640. Fans blow towards the label, and this one blows up and out (so you can see the labels on them through the grill).
Google 653908-001 and then filter for images. That is a quick trick for finding the real part out of a bunch of images. That is a 80x80x15mm fan from Delta or AVC, and later Foxconn. The short wire set and that special fan plug end means this is quite a custom build for HP. That same fan from HP you show is different from what you can see in eBay for the same code on the label.... fewer but wider blades...
Try HP directly... I recall that the Z640 uses the same fan in its riser... confirmed. Some of the Z640 risers have a Foxconn fan in the setup. Z640 search might be a better path given it is more recent. Dig in to the HP PartSurfer system and sometimes you'll find it that way. That can be odd to navigate...
The 4 wires are PWM, standard order. The order they come out of the rotor hub area could be traced and replicated with skilled and careful tracing from rotor to the 4 attachments at that plug. Here is the third fan type used by HP that I found:
03-07-2021 08:29 AM
Thanks for the reply. This is a Z620 system so I'm not following with the references to a Z640?The defective fan part is
03-07-2021 09:17 AM - edited 03-07-2021 09:18 AM
Happy to help.
It is the same exact fan and plug end on the Z620 and the Z640 riser memory cooling fan. It even is the same part number. We use both of those workstations, with risers, and I took a look.
Yes, all HP fans are able to be removed, replaced or repaired.
The best would be to get a new fan with that special plug from HP..... the PartSurfer platform may have them available. It is a PITA to work with until you figure out the tricks.
Yes, I would not hesitate to swap in another fan and splice the wires in that you already own. The order they come out of the rotor top to bottom is critical to understand by tracing each over to their plug socket. It will take a compulsion to do it right and some fine soldering and shrink tube work. That would be a fine way to go if you have the skills.
03-07-2021 09:59 AM - edited 03-07-2021 11:19 AM
Ha. I definitely don't have the skills. I was hoping it would be something like an easy unplug and replace. Everything else on the Z620 seems to be geared towards easy removal of the components with handy green buttons everywhere. Haven't figured out how to open the shroud and remove the fan itself yet.
03-30-2021 05:16 AM - edited 03-30-2021 05:22 AM
Well, the saga continues. I had ordered the only replacement fan I could find online which arrived today. The new fan is definitely different to the one it's replacing and when it's plugged in via the riser, all fans in the system run at 100%, so I guess I'll have to eat the £35 cost of replacement.
Still on the lookout for an exact replacement so if anyone has any pointers, it would be appreciated. Previous advice was to contact HP - is there a specific parts dept I can contact? Thanks
03-30-2021 08:00 AM - edited 03-30-2021 02:13 PM
The one on the left is a either partly or fully a fake. The one on the right is your original (and thus a real one). The color of the wires for the one on the left show that someone did a hack job on splicing the wires together because the wires at the rotor's hub are different colors than those at the plug end. I'm guessing that person got the wires crossed..
Carefully document the order of wires coming out of the hub on your real one, top to bottom, and trace them out over to the plug and document exactly where they enter the rear (side shown) of the plug end. Let me know... I have an idea for you but I need the documentation to work with, and it has to be exactly correct. You may want to label each of the black wires with a bit of tape out near the plug end and figure out an orientation of that plug end for where it goes into the black plastic fan holder, and document that too.
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