malfunctioning hardware - Page 2

jmke · 23rd February 2004, 19:17

you should be able to find it here somewhere http://www.madshrimps.be/gotofaqlink.php?linkid=1460

Quote:

The orange wires are for +3.3V, but on some PSUs the +3.3V wires are brown, and on some Dells they're blue with a white stripe running down them. The -5V is on the blue wire, the -12V on the white wire, but they're almost never used any more, not even for RS-232C serial ports, and they're allowed to be off by 10%.

How accurate is your meter? The worst digital ones are rated for 1% on DC volts, the best reasonably priced ones around 0.02%. IOW that 12.76V, could either be slightly off specs (6% high) or OK if the meter is inaccurate. Also some PSUs require minimum loads to make their voltages accurate, like 1A @ +12V or 1-3A @ +5V, and I've seen good PSUs put out voltages that were off by 10% when run without load.

http://www.bleedinedge.com/guides/ps...v_mod_pg3.html

23rd February 2004, 22:52

does anyone know how the 3.3v mod exactly works?

what resistors + potmeters do I have to use, and does my potmeter start at max resistance or not?

23rd February 2004, 23:23

ah, a good pic

http://home.no.net/comerade/3,3v-mod.gif

a 15ohm fixed and a 100ohm or larger pot appears to be better though

jmke · 23rd February 2004, 23:35

just watch out when playing with voltages, expensive toys you're tinkering with.

23rd February 2004, 23:41

Quote:

Originally posted by jmke
just watch out when playing with voltages, expensive toys you're tinkering with.

I know, I check voltmods several times

especially PSU's are dangerous to mess with... as I've prolly already said, the PSU from my suitcase PC trashed the mainboard, two NIC's, the soundcard, itself, the wireless mouse transmitter and the HDD

fortunately, the memory and the CPU survived it

what do you think JMke, is this 350W PSU not enough to power all this hardware? I think so, but the 3.3v rail is actually the only problem

jmke · 23rd February 2004, 23:45

the AMD XP lives from the 3.3/5v rail, if that one is lower or faulty it can take down a 450Watt PSU

that PSU might work perfectly with a P4 system though, I had a no-name 300Watt, its 5 dropped to 4.62v and the system would crash when I put my little XP1600+ @ 1800Mhz with 1.85v

24th February 2004, 11:38

i've set my CPU to 9.5*166 (1557mhz).

in windows my 3.3v rail is ~3.04volt, with my multimeter I get 3.08 volt

24th February 2004, 15:54

hmm. the PSU was lying on it's side with the fan on 5V.

I've blown the dirt out of the PSU and noticed the heatsinks in it were still very hot.
I've put the PSU in it's normal position (with the hole for the 92mm fan up. btw there's no 92mm fan in it, only a grill) and gave the fan 12v. now my 3.3v line is stable like hell at 3.30 volt (multimeter) and 3.25volt (MBM)

great, I hope the problem is fixed now. btw, the PSU is making a high-pitched sound (didn't notice that before), is that normal?

24th February 2004, 16:47

3.28 ~ 3.29, stable. fan at 7V

before RTCW:ET always crashed at 1024*768, now it's working fine again at that resolution

jmke · 24th February 2004, 17:16

When I read this thread it just screams at you: "ACCIDENT WAITING TO HAPPEN"

Quote:

Originally posted by jmke
PSU's can be a hard problem to track,.

23rd February 2004, 23:35	#14
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,022	just watch out when playing with voltages, expensive toys you're tinkering with. __________________

23rd February 2004, 23:45	#16
jmke Madshrimp Join Date: May 2002 Location: 7090/Belgium Posts: 79,022	the AMD XP lives from the 3.3/5v rail, if that one is lower or faulty it can take down a 450Watt PSU that PSU might work perfectly with a P4 system though, I had a no-name 300Watt, its 5 dropped to 4.62v and the system would crash when I put my little XP1600+ @ 1800Mhz with 1.85v __________________

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23rd February 2004, 22:52	#12
TeuS Posts: n/a	does anyone know how the 3.3v mod exactly works? what resistors + potmeters do I have to use, and does my potmeter start at max resistance or not?

23rd February 2004, 23:23	#13
TeuS Posts: n/a	ah, a good pic http://home.no.net/comerade/3,3v-mod.gif a 15ohm fixed and a 100ohm or larger pot appears to be better though

24th February 2004, 11:38	#17
TeuS Posts: n/a	i've set my CPU to 9.5*166 (1557mhz). in windows my 3.3v rail is ~3.04volt, with my multimeter I get 3.08 volt

24th February 2004, 15:54	#18
TeuS Posts: n/a	hmm. the PSU was lying on it's side with the fan on 5V. I've blown the dirt out of the PSU and noticed the heatsinks in it were still very hot. I've put the PSU in it's normal position (with the hole for the 92mm fan up. btw there's no 92mm fan in it, only a grill) and gave the fan 12v. now my 3.3v line is stable like hell at 3.30 volt (multimeter) and 3.25volt (MBM) great, I hope the problem is fixed now. btw, the PSU is making a high-pitched sound (didn't notice that before), is that normal?

24th February 2004, 16:47	#19
TeuS Posts: n/a	3.28 ~ 3.29, stable. fan at 7V before RTCW:ET always crashed at 1024*768, now it's working fine again at that resolution