Re: Ultra Xfinity 600w 5vsb mod
Maybe you put one of the capacitors in the wrong way.
Maybe you put one of the capacitors in the wrong way.
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Re: Ultra Xfinity 600w 5vsb mod
Did you change every last cap?Comment
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Re: Ultra Xfinity 600w 5vsb mod
Ah ok. I think that's a different problem. The one and only PSU I had that made a hissing noise was a Bestec ATX-250 12Z. That one really stunk up my room when I tried to use it. I think one of the capacitors in it must have failed.
Anyways, since you changed your caps, then I don't think that's the problem. Even though you didn't change the very small caps on the secondary, that should be fine as they are running on a low voltage and it's unlikely to hear any hissing from them.
If anything, check the primary side - particularly look for long leads on neighbouring traces that look like they are very close together.
Yeah, I hate high-pitched noises too.Originally posted by c_hegger
I can't hear my computers when I'm further than 3-5 feet away from them, though.Comment
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Re: Ultra Xfinity 600w 5vsb mod
It's probably feedback instability, which is often caused by either bad caps or just bad design. Someone who builds Power supplies (eg, Th3_un1qu3) would probably know more about how to fix it, but my guess is it's one of the small caps you didn't replace.
I doubt if it would really be arcing. I have a Delta-built Antec that makes an arcing/buzzing noise, but runs just fine. If it really was arcing it would fail pretty quickly.I love putting bad caps and flat batteries in fire and watching them explode!!
No wonder it doesn't work! You installed the jumper wires backwards
Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium
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Re: Ultra Xfinity 600w 5vsb mod
Get a straw and use it to listen to the power supply parts up close when its running, you wouldn't want to get shocked on the ear!
Is it actually a steady hiss, or an arcing sound? Could be a falied ceramic capacitor on the primary flyback voltage suppressor circuit. I have found out before that cheapo ceramic caps dont like voltage near their max rating.
I suppose it could be that you replaced the secondary caps with bigger ones too. I have noticed that, say, in 555 oscillator circuits, that a decoupling cap near the 555 makes the 555 output a slightly lower frequency than without the decoupling cap.
-BenMuh-soggy-kneeComment
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Re: Ultra Xfinity 600w 5vsb mod
it is like arcing...
the caps (other than the 5vsb) are same values, bigger physical size. the 5vsb caps were per what i was told shoudl be swapped... but since the cap order somehow got doubled, I have the caps needed if I wanted to swap the 5vsb caps back to the stock values.sigpic
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Re: Ultra Xfinity 600w 5vsb mod
i have since gotten the system's board to work... and when used, the 5vsb noise disappears. it IS a load related issue.
whew.sigpic
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Re: Ultra Xfinity 600w 5vsb mod
CoolI love putting bad caps and flat batteries in fire and watching them explode!!
No wonder it doesn't work! You installed the jumper wires backwards
Main PC: Core i7 3770K 3.5GHz, Gigabyte GA-Z77M-D3H-MVP, 8GB Kingston HyperX DDR3 1600, 240GB Intel 335 Series SSD, 750GB WD HDD, Sony Optiarc DVD RW, Palit nVidia GTX660 Ti, CoolerMaster N200 Case, Delta DPS-600MB 600W PSU, Hauppauge TV Tuner, Windows 7 Home Premium
Office PC: HP ProLiant ML150 G3, 2x Xeon E5335 2GHz, 4GB DDR2 RAM, 120GB Intel 530 SSD, 2x 250GB HDD, 2x 450GB 15K SAS HDD in RAID 1, 1x 2TB HDD, nVidia 8400GS, Delta DPS-650BB 650W PSU, Windows 7 ProComment
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Re: Ultra Xfinity 600w 5vsb mod
bad news. the fan controller is wasted.
that said, I do have a similar fan controller board (same PCB), but the similar one uses a bunch transistors and 2 caps, while the bad one uses an IC. also, the bad one has a 5 pin wire set to it, in addtion to the thermisitor wires and the yellow/white power wires, while the transistor one uses just the power and thermistor wires.
should i just swap and see?sigpic
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Re: Ultra Xfinity 600w 5vsb mod
It doesn't hurt. Doesn't the controller just take +12V from the PSU? I wonder how the controller decides when to increase/decrease the speed.Comment
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Re: Ultra Xfinity 600w 5vsb mod
some older fortrons (235/250W for sure) had add-on "noisekiller" PCBs screwed to the heatsink. might be worth a look if you have one kicking around.
very simple fan controller. 2pin 12V in, 2pin regulated out. thermistor can be desoldered and put somewhere other than ~2cm from the fan controller board.
I kinda have to admit i stole quite a few of these out of those old fortrons for other PSUs
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Re: Ultra Xfinity 600w 5vsb mod
the thermistor is glued in a hole in the secondary heatsink... connected tot he board by wires.some older fortrons (235/250W for sure) had add-on "noisekiller" PCBs screwed to the heatsink. might be worth a look if you have one kicking around.
very simple fan controller. 2pin 12V in, 2pin regulated out. thermistor can be desoldered and put somewhere other than ~2cm from the fan controller board.
I kinda have to admit i stole quite a few of these out of those old fortrons for other PSUs
tonight i will try the swap... and if i have the caps to do it, recap the new board. maybe simple is better?sigpic
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Re: Ultra Xfinity 600w 5vsb mod
thermisistor?AHA! So that was what that third brown wire coming from the PSU labeled "TH" was.some older fortrons (235/250W for sure) had add-on "noisekiller" PCBs screwed to the heatsink. might be worth a look if you have one kicking around.
very simple fan controller. 2pin 12V in, 2pin regulated out. thermistor can be desoldered and put somewhere other than ~2cm from the fan controller board.
I kinda have to admit i stole quite a few of these out of those old fortrons for other PSUs
They still use that same PCB on their new stuff. It has one Teapo 25V 47uF cap on it IIRC that probably doesn't need to be replaced.Comment
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Re: Ultra Xfinity 600w 5vsb mod
well, i fixed it.
the bad one had some welltrend chip on it and 2 on board thermisistors in addtion to all the transistors... all I did was splice the HS thermistor and power wires to the board and moved the 5 pin header and 2 fan sockets over from the bad board, and that did it. the 5 pins go nowhere, it is just a retainer for the cable in the psu.
the fans spun up, so far the psu is keeping cool (only being used with one cpu, gotta find some athlon MPs).sigpic
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Re: Ultra Xfinity 600w 5vsb mod
i figured out what that extra circuitry on the bad fan controller was.
it was an overcurrent protection (OCP) circuit, put ont he same PCB as the fan controller.
I still have all of the OCP part ont he bad board... since the PCBs are identical, should i move the OCP parts over to the good controller the next time the computer is down?sigpic
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Re: Ultra Xfinity 600w 5vsb mod
i re-added the OCP parts to the board, as i would rather not fry the psu if somehting bad happened.
the psu runs fine, i think that the psu is in good shape now.sigpic
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Re: Ultra Xfinity 600w 5vsb mod
6 month Stability update.
The PSU runs fine... it ultimately ended up in a revised main rig running twin Xeons (3.2ghz gallatin core).
The only issue is I think one of the fans I tossed in is starting to go out... I may keep my eyes open for a pair of better quality PSU fans... Any Brand/model suggestions?
Side note- when I do swap fans,I may take some pics... the last batch I took was never posted (they didn't turn out).Last edited by ratdude747; 05-14-2012, 01:48 AM.sigpic
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Hello...
I got my self a dead CM V700 PSU, with nothing on +5vsb
I have tried to fix it for the past 2 week, and I'm stuck... so i guess i post it here to get some pointer before i scrap it..
As you can see in photo, the psu still pretty clean, no visible damage or bulging cap.. when i got it, it still has CM seal on it
The +5vsb system use ICE2QR4765, I have trace and measure the voltage on ICE2QR4765 and the only voltage reading i got is in VCC 4.8v, Drain 310v and FB 3v.
I have read the datasheet and and still can not... -
Rescued this one
Started it up in the computer case, and noticed that it would shut down after about 10s in the BIOS
Took it out, connected to hard drive and it loses all power on all rails (except for 5VSB) after about 40s or so. (the same result happens without a hard drive connected)
The 5VSB drops to 2.5V when it 'shuts down'
And the voltage across the primary cap falls from 335V to 330V at the same moment
I think that the 5VSB is regulated by an A6069H PWM chip (which was initially dropping to 2.5V even before the the PS-ON was grounded - but it now stays at... -
EDITED: I thought my Vizio E470VL has +5VSB and no 12v on the PS board, but after plugging the cable back in and testing the pins on the Main board I realized that I do have 12V. I assume the 12V is turned on when the ON/OFF switch is pressed. The Vizio light in front does go from Standby Orange to White when ON. But, I still have no picture or sound. Test values of PS board are below.
+5VSB= +5.09
12V= +12.18
PS_ON= +2.25
I_ON/OFF= +3.27
LAMP= +3.18
DIM= +2.97
Any more testing I can do on Main board or is it just a replacement?... -
Hi badcaps! So recently, me being a butterfingers, resulted in me dropping a graphics card and having the corner land directly onto a capacitor directly above the pcie slot on my Asus p5gc 775 board. Now this caused a pretty decent dent in the top of the can, so I've decided it'd ve best to replace it. However, I've ran into an issue. The current caps are Panasonic FJS, 820μf 6.3v. These are apparently "ultra low ESR" and these aren't manufactured anymore. So it seems I'm left with a few options. Put the dented cap back in, apparently it's ESR is 0.24 ohms, but the capacitance is... -
I have an older Thermaltake PSU that has a squealing noise whenever it's plugged in, even when totally disconnected from everything else. It automatically powers on the 5V and 12V rails with full voltage, but the +5VSB circuit only has 0.9V on it. I would assume this is my first place to start troubleshooting?
There is nothing obviously burnt/leaking that I can identify.
I've tried to take some decent photos of the 5VSB area. Components of notes:- U8 at the back is marked AZ431
- C38 is 102
- C47 is 104
- C34 is a Teapo 330uF 16V (I think all the cylindrical caps are
Comment