XYMer's Home away from Home

When http://bbs.xlr8yourmac.com is down (i.e. always)
It is currently Fri Dec 15, 2017 11:11 pm

All times are UTC - 8 hours




Post new topic Reply to topic  [ 11 posts ] 
Author Message
PostPosted: Mon Oct 09, 2017 3:21 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:10 pm
Posts: 678
My G5 tower ( 7,1 model ) has been having finder freezes and roaring fans, I've looked thru the Apple Community forums
and there seems to not be any clear cut reasoning or solutions behind it, it ranges from replacing the PRAM battery to gutting it and
reseating the processors. What I've done so far is to replace the Pram bat, reset the cuda, and replaced RAM which ASP strangely
gave me a DIMM failure at J13 and J14 the mother board isn't marked ( at least not the side ram sockets occupy) , so I replaced
two banks with Crucial RAM . No joy, Finder would run for a little bit then freeze and the fans rev up.

Anyone know if there is a definitive solution ?


Top
 Profile  
 
PostPosted: Mon Oct 09, 2017 3:40 pm 
Offline
Benevolent Dictator
User avatar

Joined: Mon Apr 21, 2008 2:03 am
Posts: 14708
RAM slot numbering...

http://mirror.informatimago.com/next/de ... ion_2.html

If you're sure the RAM is good, try the Hair Dryer trick...

http://discussions.apple.com/message.js ... 7#13240047

https://discussions.apple.com/message/15223603#15223603

https://discussions.apple.com/message/15499912#15499912

https://discussions.apple.com/message/15613068#15613068

https://discussions.apple.com/thread/3270112

https://discussions.apple.com/message/16053892#16053892

No power light at all...

https://discussions.apple.com/thread/3692775?tstart=0

It can show on any G5, and even many other computers & electronic devices of the period.

http://www.macintouch.com/reliability/pmg5.html
 
 http://lowendmac.com/ppc/power-macintosh-g5.html

And see this last one in particular...
 
https://discussions.apple.com/message/16781690#16781690

Heat gun better...

https://discussions.apple.com/thread/3916312?tstart=0


Top
 Profile  
 
PostPosted: Mon Oct 09, 2017 6:17 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:13 pm
Posts: 9628
Location: Caught between the moon and NYC
I would try installing just the new memory in a couple slots and see if the situation changes.

But issues revolving around the memory controller on G5s are rather common. The hairdryer trick basically tries to reseat the BGA chip on the far side of the motherboard and possibly the DIMM slots themselves.


Top
 Profile  
 
PostPosted: Thu Oct 12, 2017 2:32 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:10 pm
Posts: 678
So the problem is the lead free solder on the memory controller ?
*shrugs*
I'll give it a go, I have a hot air soldering gun that I bought to replace defective caps
in an iMac. The lead free solder is a bitch to melt, it acts like aluminum, where it
doesn't have any visual indication that's it's molten.

Does anyone have a Service Source for the PPC G5 tower ?
I'd like to know where the BGA chip is.


Top
 Profile  
 
PostPosted: Fri Oct 13, 2017 12:45 pm 
Offline
Benevolent Dictator
User avatar

Joined: Mon Apr 21, 2008 2:03 am
Posts: 14708
http://tim.id.au/laptops/apple/powermac/powermac_g5.pdf

It's underneath the board between the centre RAM slots


Top
 Profile  
 
PostPosted: Fri Oct 13, 2017 1:40 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:10 pm
Posts: 678
Thanks BD


Top
 Profile  
 
PostPosted: Sun Oct 15, 2017 4:41 pm 
Offline
Benevolent Dictator
User avatar

Joined: Mon Apr 21, 2008 2:03 am
Posts: 14708
Possible further info...

450° F. is the target temperture & I understand it's a 5 layer logic board.


Top
 Profile  
 
PostPosted: Mon Oct 16, 2017 8:22 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:10 pm
Posts: 678
450º seems low for that lead free stuff, my soldering iron is set to 600ºF and it doesn't even dent
that stuff, 800ºF sorta does the trick.


Top
 Profile  
 
PostPosted: Mon Oct 16, 2017 8:51 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:13 pm
Posts: 9628
Location: Caught between the moon and NYC
At 800 you might want to take the board out of the system and lay it chip side up. Otherwise you might end up melting the intervening copper layers.

I don't think it's a lead free solder issue. G5s were made from 2003 to 2006 and the lead free solder regulation didn't go into effect until 2006. RoHS was written in 2003 but that's too quick for an in-production system to be adapted to a requirement that wouldn't be needed for 3 years. To my knowledge this issue afflicts all G5s, not just late ones, so if it was lead-free solder it would only afflict the later models.

Didn't Nvidia's BGA issues predate lead free solder? As I recall they screwed up their solder mixture and that led to the huge increase in failures. After 11-14 years of heating/cooling cycles even non-leadfree solder could end up cracking. Doesn't the G5 memory controller hit 80-90C?


Top
 Profile  
 
PostPosted: Tue Oct 17, 2017 4:05 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:10 pm
Posts: 678
I'm not sure what the solder is, it definitely has a high melting point and it flows like crap,
unless the board manufacturers flux the heck out of board before soldering and rinse off the
flux off. When re capped my iMac, I fed in some 60/40 solder to help get a good solder joint.

I haven't had time to tackle the G5 tower, there's a lot of stuff to dismantle before getting the mobo out.
But advice noted on having the board oriented right if the BGA chip is surface mounted.


Top
 Profile  
 
PostPosted: Wed Oct 18, 2017 6:39 pm 
Offline
User avatar

Joined: Thu May 15, 2008 8:13 pm
Posts: 9628
Location: Caught between the moon and NYC
Yeah dismounting the HSFs and CPUs in a G5 is half the battle.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 11 posts ] 

All times are UTC - 8 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group