Welcome to the MacNN Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below.

You are here: MacNN Forums > Hardware - Troubleshooting and Discussion > Mac Desktops > Problem with PowerMac G4 WF800

Problem with PowerMac G4 WF800
Thread Tools
digweed
Fresh-Faced Recruit
Join Date: Oct 2006
Status: Offline
Reply With Quote
Sep 12, 2007, 04:53 PM
 
Hello everybody,



i tried to overclock my Power Mac G4 MDD 1,25GHz using the following scheme :



- PM G4 MDD Overclock

The goal was 1,417GHz, i soldered the resistors according to the scheme,
but when i powered up the machine and booted to Mac OS X, the Software reported 1,58GHz.
The machine wasn´t stable and i decided to solder the transistors back to their original position,
the result was 1,08GHz (I dont have the steadiest hands, i guess...)
I re-did the soldering, and probably ruined the tracks on the board by doing that.
When i power on the machine, the monitor stays black and after 10 seconds, the fans power up in max rpm,
resetting the PMU sometimes gets me to the gray screen with the apple logo in the middle, when i try to boot the cd, i get the stop sign.
I had a professional fix the tracks on the CPU, still the same,
my local Apple reseller told me that the problem is the motherboard, but i´m not so sure.
I only changed the multiplier, not the fsb or the voltage or anything,
if the CPU was toasted, it shouldn´t power on at all ?
Any help or suggestions appriciated.
( Last edited by digweed; Sep 13, 2007 at 01:13 PM. )
     
BigBadBiologist
Dedicated MacNNer
Join Date: Nov 2004
Status: Offline
Reply With Quote
Sep 12, 2007, 09:16 PM
 
I would clean all of the resistors and solder off of the CPU (well, obviously not the WHOLE CPU, just the PLL config resistors that you messed with). Then just paint the proper connections using rear window defogger repair kit.

Also, are you using thermal paste between your CPU and heatsink?
I love lamp! I love lamp...
     
digweed  (op)
Fresh-Faced Recruit
Join Date: Oct 2006
Status: Offline
Reply With Quote
Sep 13, 2007, 01:35 AM
 
Originally Posted by BigBadBiologist View Post
Also, are you using thermal paste between your CPU and heatsink?
yep
AS5
     
   
 
Forum Links
Forum 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
Top
Privacy Policy
All times are GMT -4. The time now is 01:30 AM.
All contents of these forums © 1995-2017 MacNN. All rights reserved.
Branding + Design: www.gesamtbild.com
vBulletin v.3.8.8 © 2000-2017, Jelsoft Enterprises Ltd.,