PSU Upgrade Compatibility

[JazzDogTraveler]

I have scoured the HP Community group for an answer to my situation.  I want to upgrade the 185 Watt PSU to a 400 watt PSU.  I have the TP01-1227c desktop PN: 9EF10AA, with the BAKER  Rev. A M11 mainboard.   I have found  400 watt PSU part numbers for models close to mine, but with different boards, or different sub models.  On my PC the 7-pin P2 plug has 4 wires.  I have found several alleged PSU part numbers that work with similar desktops, but each of these has either 3 wires in the P2 or 6 wires in the P2 or all 7 wires in the P2.  I am reticent to try something that is not like-for-like. 

The only reason I am sticking with this little underappreciated machine is because this is a spare PC that I hauled out of storage so I can do a bit of Steam gaming over Linux and change my Windows rig over to video production, without having to spin up a VM for Linux. I don't do MMO games; only strategy, turn-based games. 

[NonSequitur777]

@JazzDogTraveler,

Welcome to our HP Community forum!

The part number for a compatible 400-watt power supply for your PC is: L69242-800 (L04618-800 / 942332-001).

You can purchase one of these units, new, via eBay, such as this trusted eBay Seller: New PSU Power Supply For HP 400W L69242-800 US | eBay.  But shop around, you can purchase this power supply for less.

A 500-watt power supply with p/n: L05757-800 is also compatible with your desktop.

Kind Regards,

NonSequitur777

[JazzDogTraveler]

Thank you. I have looked at this very eBay listing, but this one has 6 wires in the plug, where my P2 plug only uses 4.  Is It okay to use ones with different number/color wires on P2?  I have read some HP Community blog threads mentioning this issue, but it was for the 3-wire P2 plugs, not 6/7 wire P2 plugs. I'd like to stick with OEM only. 

I have over 30 years commercial IT experience, including building/rebuilding PCs, but I always stuck with ATX-family form factor machines and rarely encountered proprietary hardware where off-the-shelf gizmos won't fit.  Through the 2000s and 2010s I was Dell PC, Dell Server,  IBM/Lenovo, and HP Printer certified.  I have stripped down and rebuilt HP business laptops, replacing mainboards and accy , but those things were expected to be weird inside.  All of the competition can be proprietary inside, but HP takes the crown for "originality."  Bless HP; they try hard.

[NonSequitur777 · Accepted solution]

@JazzDogTraveler,

Well, to say it straight to the point: given the dearth of accessible technical documentation in the HP Reservation, yes, there is a chance that the specific power supply I referenced may not work correctly in your PC.  However, because I wasn't exactly born yesterday, I would guesstimate that possibility to be remote. 

Nevertheless, one should never underestimate Mr. (let alone Mrs.) Murphy, and that's why I selected a Seller who allows for "30 days returns. Seller pays for return shipping."

Kind Regards,

NonSequitur777

[JazzDogTraveler]

Excellent.  I like your style.  I appreciate your time in answering me and giving me your best opinion and honest guess.  I have seen "verified" parts not work in devices, so I guess anything is possible. Textbook answers rarely work on an IT workbench. 

I'm giving them a shot. Again, thank you. 

[NonSequitur777]

@JazzDogTraveler,

You are quite welcome.

If you don't mind, please follow up to share how things went.

Kind Regards,

NonSequitur777

[JazzDogTraveler]

I woke up one night, around 2 AM with a possible test solution. I remember having some other HP Pavilion desktop PCs in my storage unit, that I received from people who gave me their cast-offs . About 10 days ago, I went to the storage unit and found another Pavilion with the similar class MOBO. This PC had a 180W watt HP PSU with only 3 wires, like many of the third-party PSUs. I pulled the PSU, swapped, and the computer booted up. I noticed the PSU fan ran on high, all the time, where my original PSU fan ran at different speeds or only when temps went up, so the purple wire must be a fan temp/tach.  I know I had said that I only wanted OEM, but the highly-rated one I found was 1/2 the price and I decided that it was okay to risk a third-party PSU, if it is rated high enough. Since I had no boot errors, with the current three wire PSU, I gave it a shot.  The PSU arrived, I installed, booted and I've been gaming and ignoring my responsibilities like I was a teenager again.