[TechAssist] Re: ATX Computer-How does it start up?
- From: "Technotronic Dimensions" <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 4 Jun 2004 12:39:47 -0400
Roger:
You test ATX PS out of PC by Jumpering pins 3-4 on the
Connector with the Key facing you. Place an old Spare Hard Drive on it as a
load first as a precaution. If the drive Spins up , chances are the PS is
ok.
A board also wont power up if the CPU or memory is bad or not
seated properly. Or if there is a problem with an expansion card. If thats
all ok, then the BIOS may be bad...but usually if you hear a speaker "BEEEP"
it means BIOS is in tact.
Steve Hearns
Technotronic Dimensions, NY [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
1-877-817-9885 (Voice / Fax Toll Free - US Only)
----- Original Message -----
From: "Roger G" <rogerfixit@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 04, 2004 12:25 PM
Subject: [TechAssist] ATX Computer-How does it start up?
ATX Motherboard- Computer had 'No Power'.
Checked power supply - works OK
Checked continuity on front panel switch to ckt bd connector - OK
Pulled ckt bd and checked physically - look OK. Ground continuity from
switch connector to power connector is fine. Cannot trace where the 'Plus
'
side of switch goes to.
There has to be some sort of 'latching' ckt to connect the power up pin on
power supply to ground to keep it turned on. There are four TO-220
transistors on the board - the ones I can read are FET's marked G-D-S. They
are heat-sinked and some are hidden behind capacitors. If I have to pull
'em, I have to.
Any insight appreciated
Roger G.
Mr. Fix-It
Harrisburg, PA 17110 WebSite- http://mrfixit.netfirms.com
rogerfixit@xxxxxxxx
FAX 510-740-3641; Tel: 717-763-7098 (shop) 717-652-1703(home)
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