Re: 5v rail to high
12v is beetwen 11.768/11.840, 3.3v is at 3.36v, it's an old half bridge and group regulated PSU with 30a rectifiers on all rails, so you can't ask for much but is well built and it works OK for 300w
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Re: 5v rail to high
Well, the light load theory is a stab in the dark with these supplies. Regulated 5 volt supplies should be within .1 volts. The whole principle of regulating a voltage is that the voltage output remains constant whilst the load current varies. How close are the other voltages, by the way?Leave a comment:
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Re: 5v rail to high
Sorry I didn't write what I wanted to, my mind was in another place, what I wanted to say is that the 2 deltas are on the 5v rail, and since I put them in the voltage went up, and yes they move a lot of air at 5v one of them is a 110 cfm fan, it's a copy of a delta afb but it works really fine, the other one is a 80mm intel fan Delta guetto mounted on the side panelLast edited by Drack; 12-28-2016, 05:39 PM.Leave a comment:
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Re: 5v rail to high
Are they molex fans? What I do with those is just cut the diagonal part off of the molex connector and flip it around, so the fan runs at 5V. Most fans still move a decent amount of air at 5V and are A LOT more quiet. This will also satisfy the 5V rail a little bit because it will be giving it something to do.Leave a comment:
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Re: 5v rail to high
I measured with a yaxun dmm AMD with Asrock oc utility both said the sale thats only when i push the 12v rail, i know, its group regulated thats why its that high, i have 2 delta fans on 5v, but when those fans are not connected the 5v rail will go down to 5.256v/5.236, I would put the fans on 12v but they are to loud for my taste at full blast(42db)Leave a comment:
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Re: 5v rail to high
It's due to the design of the power supply.
It simply expects you'd have more stuff using 5v in your computer but you don't because modern computers use mostly 12v nowadays.
5.280v is nothing to worry about, most components that use 5v will be fine with up to 5.5vLeave a comment:
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5v rail to high
Hi guys, Merry x-mas
My psu( https://www.badcaps.net/forum/showth...781#post702781 ) is having a litte problem, the 5v rail is getting a bit high(5.280v the max allowed by ATX specs is 5.250v). i Know 30mv is not huge, but i want to Know what do you guys think about it
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Hi, I'm Daniel, and I'm new to the world of repairing motherboards.
I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.
I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.
So, I generated a table with AI so I can... -
Hi,
A colleague gave me an apparently ill CORSAIR CX600.
He told me that he heard a banging noise, and smelt the magic smoke.
After tearing down the PSU, no burnt component, everything seems OK, but the PSU often refuses to stay ON. When shorting PS_ON to GND, the fan spins a bit a finally stops. No output voltages.
I tried to treat some apparently bad solder joins and finally it seems to work OK... on the 12V and 5V rails!
It's another story on the 3.3V rail...
I have some devices to test deeply PSUs (scope, AC source, electronic load)... -
Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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Dear all,
I have taken out the motherboard of a Acer TravelMate P214. There is a short to ground on the main power rail (19V). I don't have the schematics or boardview for this board (DAZ8IMB1AA0 REVA). But I have found 4 MOSFETS close to the main power rail : 2 N-Channel and 2 P-Channel.
I have checked resistance across each of the 4 MOSFETS. I have the following readings:
Both N-Channel Mosfets: nothing odd
P-Channel MOSFET number 1:
source - drain : 117 kOhm
source - gate: 96 Ohm
gate - drain: 117 kOhm
P-Channel MOSFET... -
Hi all.
This notebook was showing no signs of life.
I removed the FH52M LA-J891P mainboard and found that there was 19V at the DC jack.
However there was zero volts on the two PRB2 and PRB46 resistors immediately after the two polarity protection MOSFETs (PQB11 & PQB12).
If I remove the PQW1 MOSFET, the 19V rail starts working, and I can turn on the unit - at least I get the fans, and the power light comes on, when I simulate the power button being pressed. No display.
I tried replacing the MOSFET with a new one, but again no voltage on the...
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