PS2 port failure

[PCBONEZ]

Re: PS2 port failure

Check +5v at PS/2 port both before and after the keyboard 'goes away'.
Check from under the board at the solder joints so you don't have to disconnect to check the volts.

Far chance your problem is the +5v on the PSU you are using drops below the threshold for the IC chip inside the keyboard.

[kaniki]

Re: PS2 port failure

you shouldnt rip or break anything off - ever.
you risk ripping the tracks up doing that.

and you dont short anything together afterwards either.

that is what i kinda thought. that is why when i read that they fix was to take it off, my first thought is "if you take it off and dont short it out, you kill the power source, so how does it work if you kill the power?' that was my thought at least.

From what i have read about it, it is the same problem with this board as the TUSL2-C board. I did take the cover off the PS2 port and nothing was broke or bent or shorting out in there, I also checked the solder joints under the board and all was solid there too. The power supply is a 300 watt but that should be enough to power a 1 gig processor system. there is not much extra in it and i did pull out the pci cards and tried it that way too. still the same.

Do you know if the whole c151 chip thing was a hoax or was there some merit behind it?

[stj]

Re: PS2 port failure

it may not be a hoax,

i'v had acade pcb's that use ceramic aray's on the inputs.

think a line of ceramic's between the signals and the ground.
it's for noise suppression, but sometimes one goes short and the input looks stuck on.

if you get one of these ps2 problems, try metering the resistance between ground and the clock,data & reset pins.

[pfrcom]

Re: PS2 port failure

I desoldered the C151 eight leg capacitor, did NOT "remove it by force" as suggested in the Asus forum

That board is in storage most of the time, but its PS/2 ports do work fine every time I use it

[kaniki]

Re: PS2 port failure

so someone has had luck with doing this then.. I guess I will give it a try and hope for the best. If all it does is act on behalf of the PS2 and it messes somehting up, well... they dont work now so no harm done. Ill let you know how it turns out.. probably wont get to it till more towards evening..

[PCBONEZ]

Re: PS2 port failure

I wasn't suggesting your PSU is too small, I was suggesting it's bad and doesn't hold voltage on +5v.

Also P3 boards pull CPU power from +5v so if that's a "P4 PSU" you may have too much load on +5v and too little on +12v for it to regulate properly.

.

[kaniki]

Re: PS2 port failure

well, it is the same power supply that has been in there for years. and it just stopped working one day. I removed the extra stuff like the roms, hard drive.. well i disconnected everything but the motherboard and processor and fans and tried it again same response.. and by that point in time, there is nothing to overload even a P4 power supply. I did check the power readings per voltage and they were all within 0.1v of there rating. also just for the heck of it i tried a different power supply.. 400 w this time.. same response.

[kaniki]

Re: PS2 port failure

Ok. I got the chip out and that did it. Removing that c151 chip did it. Both PS2 ports are now working. I just wish that they put it in a better place. If it was just a little better positioning, then i would not have had to take the motherboard out. But i did not want to damage any other parts since they were so close so I had to remove it. Fun!!! I think i read that there were something like a half dozen or so boards that this was a problem with.

[pfrcom]

Re: PS2 port failure

May be useful for someone Googling, to know it works on CUSL2, as well as TUSL2

[kaniki]

Re: PS2 port failure

I did find this while searching

After later look at ASUS's NetQ Forum found that the problem in Asus motherboards in certain types or the more common, these motherboards models include CUSL2, CUSL2-C, CUSL2-M, CUSL2-C-BP, TUSL2-C, TUSL2-C, CUV4X, CUV4X-C, CUBX, A7VPRO, etc., with the motherboard model and also having this problem

so obviously it is a problem in a lot of asus motherboards.

Did i ever say how much i dont like asus motherboards??? I said it before.. I have had nothing but problems with any model i have ever bought.. funny thing is that it is the only brand that i have had major problems with..

[Scenic]

Re: PS2 port failure

if the CUV4X series is also affected, this may also apply to the Medion 2001 Mainboard (which is an Asus CUV4X-VM (microATX) just without the temp. monitoring)

kinda shocked though that they say the CUBX is affected. was one of the last Asus boards i've had (and still have somewhere) that was absolutely rock solid and glitch-free.. (much like the "legendary" Asus P3B-F slot 1 boards).
after that board generation, the quality took a massive nosedive (imho)..

[stj]

Re: PS2 port failure

asus dont make the capacitor array, this could effect a lot more than asus and a lot more than motherboards!

clearly there is/was a big batch of defective arrays made.

[PCBONEZ]

Re: PS2 port failure

Asus hasn't been good since the 90's.
CUSxx and TUSxx were right about when Asus turned bad.
.

[pfrcom]

Re: PS2 port failure

Asus hasn't been good since the 90's.
CUSxx and TUSxx were right about when Asus turned bad.
.

Can't disagree with that

P4P800-E Deluxe I have, has CRAPacitors in the VRM (OST or Elite, can't remember which), which get pretty warm, along with the Mosfets

Been considering a pre-emptive re-cap

[kaniki]

Re: PS2 port failure

well, i guess i do have to give some credit to this one.. it is a good running system.... rock solid... and this was the first problem.. considering it is a P3.. that isnt all to bad. but like they say, it was about P4 and up that went to crap.. and all the systems i built with ASUS boards were all P4 and up. I had 1 board that I returned 3 times to get it fixed. they still could not get it right. after that i just gave up. what i find really funny is i have had decent luck with cheapo boards like elitegroup, biostar, MSI and gigabyte. They are all cheaper boards that i used, and no returns, but every ASUS board that i got, which had longer warranties and higher prices are the ones i always had problems with..

as for the list of bad boards or effected boards. I did not do any research to them. I just found that on the net and copy and pasted the info. I can not say to how much if them is actually faulty and / or if any are any good.

[PCBONEZ]

Re: PS2 port failure

Some of Asus brand new boards [last 2-3 years] seem to be having stability problems because they went nuts using 100% polys 'for show' and they lowered ESR too far in the non-VRM areas of the board.

If you don't have -some- ESR [or other resistance] then the board looks like a dead short to the ripple in the PSU and all that ripple current makes a bee-line for the mobo instead of getting filtered out before it reaches the board.

Looks to me like Asus just stuck polys in were the designs called for electrolytics [rather than -designing- boards for polys from the ground-up] and that's pulling PSU noise [and ripple CURRENT] that shouldn't be there out to the chipset and slots.

100% poly in the VRM is fine [we know this from experience] but taking a design that calls for [say] 6 lytics out by the slots and sticking in 6 polys is going to -encourage- ripple current to bypass the PSU caps and go through the board to the slots where the ESR [aka 'resistance'] is lower. - That's just going to heat-up the traces on the board as well as destabilize the voltages along the trace's path.

.

[paul_h]

Re: PS2 port failure

Asus hasn't been good since the 90's.
CUSxx and TUSxx were right about when Asus turned bad.
.

From the intel side of the fence, but I had an a7v133 and a nforce2 asus that were alright. They went bad after that for AMD though.
The a7v133 was overclocked and overvolted it's whole life, so died a gallant death. The asus nforce2 was killed by an antec SP

[kaniki]

Re: PS2 port failure

...so died a gallant death. The asus nforce2 was killed by an antec SP

did you give it a good salute and burry it with honers?? kinda reminds me of one of those movies where a knight dies defending a town from evil beings..

[ratdude747]

Re: PS2 port failure

From the intel side of the fence, but I had an a7v133 and a nforce2 asus that were alright. They went bad after that for AMD though.
The a7v133 was overclocked and overvolted it's whole life, so died a gallant death. The asus nforce2 was killed by an antec SP

you could pull a c hegge and cremate it!