Badcaps.net Forum
Go Back   Badcaps Forums > Motherboards with Bad Capacitors > Major Manufacturers Boards
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 10-13-2010, 05:12 PM   #21
PCBONEZ
Grumpy Old Fart
 
PCBONEZ's Avatar
 
Join Date: Aug 2005
City & State: Phoenix, AZ
My Country: USA
Line Voltage: 120V 60Hz
I'm a: Professional Tech
Posts: 10,631
Default Re: IBM Thinkcentre S50 TYPE: 8086

Yes, a good cap should show charge and discharge on an ohm meter.
If it's a solid number then there is a parallel path or it's open or shorted.

And, some close in pics would be good about now. [hint, hint]
.
__________________
Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.

-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.

- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
-
PCBONEZ is offline   Reply With Quote
Old 10-14-2010, 09:22 PM   #22
momaka
Badcaps Veteran
 
momaka's Avatar
 
Join Date: May 2008
City & State: VA (NoVA)
My Country: U.S.A.
Line Voltage: 120 VAC, 60 Hz
I'm a: Hobbyist Tech
Posts: 8,952
Default Re: IBM Thinkcentre S50 TYPE: 8086

Quote:
Originally Posted by jimmy274 View Post
No thoughts on this whatsoever? Anyone?
I don't know, but the resistance looks fine to me - reason I say this is because voltage on Vcc_agp is low, so 40 Ohms doesn't sound like a lot for that. I measured resistance on what I think is Vcc_agp on a Jetway socket 462 motherboard with a video card installed in the AGP slot and got a reading of ~25 Ohms. There were 2 other MOSFETs in the AGP area, and they read around 100 Ohms to ground. Not sure if that helps you with anything.
momaka is offline   Reply With Quote
Old 10-15-2010, 10:43 PM   #23
jimmy274
New Member
 
Join Date: Sep 2010
City & State: Belgrade, Serbia
Posts: 10
Default Re: IBM Thinkcentre S50 TYPE: 8086

Well, I just realized that vcc_ddr is fine - solid 2.6v with resistance of 30 ohms. So it might be that vcc-agp has no short - it's just that power is not delivered to it (0 volts), which could mean that powermos is fried. I need to check the gate voltage to know for sure, though (and that's probably pulse width modulated, so I'll need my oscilloscope).
Will post back when I'm done. Thanks momaka.

EDIT: If I'm not mistaken, I think that vcc_agp should be around 1.5v. Someone correct me if I am.

Last edited by jimmy274; 10-15-2010 at 10:46 PM.. Reason: forgot one thing
jimmy274 is offline   Reply With Quote
Old 01-08-2011, 10:38 AM   #24
spiros123
New Member
 
Join Date: Jan 2011
Posts: 1
Default Re: IBM Thinkcentre S50 TYPE: 8086

Hi,

I had the same problem with an IBM 8086 where the fans just turn on and nothing happens. Originally it just had a bad power supply, switched it with another one and that fixed the problem. But when I put in a new power supply the thing wouldnít turn boot, just the fans and thatís it.

I had a student open it up and remove the CPU heatsink and there was a loose low profile resistor (that what a friend told me theyíre called). I have ZERO electronics experience with soldering but was able to solder it and it worked. (Reapply thermal paste to the CPU before putting on the heatsink. It has worked without issue for the past 2 week. It also has had a full 2 GB ram installed.

Unfortunately, I now have the same problem with another computer where only the fans turn on. It did have Blue screen of death, JUST before that. Iíll tell you what happens when I fix it.

I do agree that these small cases heat up too much. Iím a classroom teacher and have 12 of there in my room. The one I use regularly reports high temps (50C) with Speed Fan 4. I have not been able to get the fans to stay on high but they are variable on theyíre own. Iím looking at getting a PCI slot fan and test it out on one computer before doing it on any others.

-spiros
spiros123 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums © 2003 - 2019
Powered by vBulletin ®
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 03:38 PM.
Did you find this forum helpful?