HP-D3057F3H recap

[Shocker]

Re: HP-D3057F3H recap

I don't have an oscilloscope.

Neither the 1000uF MBZ nor the 3300uF HM were from Vcore.

[c_hegge]

Re: HP-D3057F3H recap

I doubt it would be much. I polymodded one once, and used a 6.3v 1000uF Nichicon L8 in that position. I got exactly 2.0mV from the 5vsb with 1A Load. My main concern is actually where they came from. If he scavenged them from the VRM low side of a motherboard, then they will have de-rated to 1.5V or so.

[mockingbird]

Re: HP-D3057F3H recap

I am curious how much ripple is coming out of your +5VSB line with that MBZ in there...

[Shocker]

Re: HP-D3057F3H recap

I would have used closer caps to the originals if I had some

But the MBZ were the only quality 1000uF 8mm I had, and while I had a third Hipro to take parts from (which was where I got the Chemi-con primaries), I chose to save the 2200uF 16V KZEs for something that actually needs 2200uF 16V 10mm caps.

Anyway, it works, and that's what matters.

[c_hegge]

Re: HP-D3057F3H recap

^
I've recapped about 20 of those in the past. Usually, the 1000uF teapo on the 5vsb fails, and the PSU won't start. They are good PSUs, though, after a recap.

[Shocker]

I did this earlier today using capacitors from old motherboards. I'm glad I didn't wait longer to do it. Even so, I should have done it much earlier. You'll eventually find out why...

Original capacitors (all are 10mm except the +5VSB):

• +3.3V: LTEC LZP 2200uF 10V
• +5V: LTEC LZP 2200uF 10V
• +12V: Chemi-con KZE 2200uF 16V
• -12V: Chemi-con KZE 2200uF 16V
• +5VSB: Teapo SC 1000uF (bulged) and 470uF 10V

Replacement capacitors:

• +3.3V: Nichicon HM 3300uF 6.3V
• +5V: Nichicon HM 3300uF 6.3V
• +12V: Not replaced
• -12V: Not replaced
• +5VSB: Rubycon MBZ 1000uF 6.3V

I also replaced the primary caps (Teapo LH 680uF 250V) with Chemi-con SMQ (same value and voltage). Best to be on the safe side.

I was originally keeping it on the list of spare PSUs to be (eventually) recapped. Only today did I discover that the repair was overdue.

I went to install the fixed PSU in my PC. I pulled another (unrepaired) unit out of my PC. I waited long enough for one of the +3.3V caps in that one to go from non-bulging to leaking. (In case you're wondering, the +5VSB caps in that one weren't bulging.)

The only symptom of that crap was a faint high-frequency whine.

Morals of the story:

• Even totally busted caps don't always show obvious symptoms.
• NEVER leave crap caps alone.
• Never, EVER use an HP-D3057F3H with the original caps.

Any comments???