Re: iMac G5 2GHZ Graphics Problem
I was getting ready to write this last night when the power went out. I attempted to use the candle method to reflow the solder, which was an epic fail. The problem is worse now. Oh well, thank you all for your help, I've learned a lot about the iMac G5, and will keep my eyes open for a motherboard on Ebay. Thank you all! -Jonas On Mon, Feb 8, 2010 at 2:03 PM, Kyle Hansen pi...@speakeasy.net wrote: On 2/8/10 12:29 AM, Kris Tilford ktilfo...@cox.net wrote: On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. You beat me to it. I would not have used a conductive material. I would have gone to the hardware store and got a heat gun and just warmed it up a bit then slammed it back together or used the candle technique: http://geektechnique.org/projectlab/726/diy-obsolete-ibook-logic-board-repai r --- The first time Microsoft produces something that doesn't suck will be when they start making vacuum cleaners --- -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Nanny note Re: iMac G5 2GHZ Graphics Problem
Jonas, I know this is a couple of days late, but here in DC we are having our highest snowfall total winter since 1870 and I have been without power and away from the lists until today. Please do not post attachments on the lists. There are still people on dial up and some on metered service ton the list. In the future, either offer to email the attachment off list to interested parties, or to post the jpeg on a photo sharing site and post the link in your email. Thanks,. Len Gerstel lgers...@gmail.com List Nanny G3-5 List On Feb 7, 2010, at 2:36 AM, Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list Picture 1.jpg -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: Nanny note Re: iMac G5 2GHZ Graphics Problem
Ok, thanks for letting me know, I didn't know that. Yeah I'm actually stuck on dial-up still... Oh well I guess thats what you get for living in the middle of no where! In the future I will upload any pictures to a website and provide the link. Thanks, -Jonas On 2/9/10, Len Gerstel lgers...@gmail.com wrote: Jonas, I know this is a couple of days late, but here in DC we are having our highest snowfall total winter since 1870 and I have been without power and away from the lists until today. Please do not post attachments on the lists. There are still people on dial up and some on metered service ton the list. In the future, either offer to email the attachment off list to interested parties, or to post the jpeg on a photo sharing site and post the link in your email. Thanks,. Len Gerstel lgers...@gmail.com List Nanny G3-5 List On Feb 7, 2010, at 2:36 AM, Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list Picture 1.jpg -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. Perhaps I don't fully appreciate the situation, and if the pennies are electrically isolated from ALL electronics if they get loose, then you're probably ok. If not, I'd strongly suggest stopping using this iMac until you can figure out some type of non-conductive, heat resistant shim material. I've heard that some people cut up a CD disc to make shims. I'm sure there are many possible non-conductive shims materials that can be fabricated for next-to-nothing. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
Kris Tilford wrote: On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. Is this a future computer Darwin Award? Loose metal in an electrical/electronic environment can be entertaining but usually only once per unit. Peace, Dennis -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/8/2010 2:29 AM, Kris Tilford wrote: On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. Perhaps I don't fully appreciate the situation, and if the pennies are electrically isolated from ALL electronics if they get loose, then you're probably ok. If not, I'd strongly suggest stopping using this iMac until you can figure out some type of non-conductive, heat resistant shim material. I've heard that some people cut up a CD disc to make shims. I'm sure there are many possible non-conductive shims materials that can be fabricated for next-to-nothing. Yes, I would not use pennies, you could blow your board or other components. You can cut up some index cards to fit by making a square with center removed, or carve up a cd like Kris said. Other than the potential for fireworks congrats on your repair. =) -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
Yeah it does sound stupid, however the pennies are taped together VERY well, and are taped to the surface VERY well, unfortunately the problem is back so I'm thinking of trying to reflow the solder on that chip. Any ideas of how to do this? -Jonas On Mon, Feb 8, 2010 at 4:42 AM, Jason Brown jason_br...@charter.net wrote: On 2/8/2010 2:29 AM, Kris Tilford wrote: On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. Perhaps I don't fully appreciate the situation, and if the pennies are electrically isolated from ALL electronics if they get loose, then you're probably ok. If not, I'd strongly suggest stopping using this iMac until you can figure out some type of non-conductive, heat resistant shim material. I've heard that some people cut up a CD disc to make shims. I'm sure there are many possible non-conductive shims materials that can be fabricated for next-to-nothing. Yes, I would not use pennies, you could blow your board or other components. You can cut up some index cards to fit by making a square with center removed, or carve up a cd like Kris said. Other than the potential for fireworks congrats on your repair. =) -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On Feb 8, 2010, at 10:53 AM, Jonas Ulrich wrote: Yeah it does sound stupid, however the pennies are taped together VERY well, and are taped to the surface VERY well, unfortunately the problem is back so I'm thinking of trying to reflow the solder on that chip. Any ideas of how to do this? The most common methods are using heat guns (specialized ones used for assembling surface mount devices to start with) and using an oven. Then there's the tea candle method... http://geektechnique.org/projectlab/726/diy-obsolete-ibook-logic-board-repair -- Bruce Johnson University of Arizona College of Pharmacy Information Technology Group Institutions do not have opinions, merely customs -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On Feb 8, 2010, at 11:53 AM, Jonas Ulrich wrote: Yeah it does sound stupid, however the pennies are taped together VERY well, and are taped to the surface VERY well, unfortunately the problem is back so I'm thinking of trying to reflow the solder on that chip. Any ideas of how to do this? -Jonas Your best bet would be to take it to a professional to do this. Some charge as low as 40 bucks but it varies. It can be as high as 200 bucks for a board or more. If you read one of my past messages, it can be done at home, but is VERY risky. I call it the Redneck reflow. To summarize, and this isnt instructions to do it. Preheat your oven, toss board in oven lol. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 8/2/10 17:53, Jonas Ulrich jonasulrich3...@gmail.com wrote: Yeah it does sound stupid, however the pennies are taped together VERY well, and are taped to the surface VERY well, unfortunately the problem is back so I'm thinking of trying to reflow the solder on that chip. Any ideas of how to do this? -Jonas You need someone with a hot air smt solder rework station - blows very hot air through varied sizes of nozzles depending on the accuracy required.I have an Aoyue 909 which has been very useful. If using a different method like a normal hot air gun (paint stripper) or the oven method beware of components which are soldered through the board - these can fall off altogether if not supported. You can improve your accuracy with a hot air gun by masking all but the targeted area with metal foil - it's difficult without a rework station though. Pete -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/8/10 12:29 AM, Kris Tilford ktilfo...@cox.net wrote: On Feb 7, 2010, at 11:23 PM, Jonas Ulrich wrote: FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! Using pennies sounds seriously dangerous. Anything that conducts electricity that might get loose inside is asking for a short-circuit that will possibly put a permanent end to your iMac. You beat me to it. I would not have used a conductive material. I would have gone to the hardware store and got a heat gun and just warmed it up a bit then slammed it back together or used the candle technique: http://geektechnique.org/projectlab/726/diy-obsolete-ibook-logic-board-repai r --- The first time Microsoft produces something that doesn't suck will be when they start making vacuum cleaners --- -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/6/10 11:36 PM, Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. First, try creating a new user account and see if the problem exists in that account. That will rule out user settings (weird ones at that). Second try booting from an installer disk to see if you see it there. If it's there then it's a hardware problem. If not you should probably wipe the disk and reinstall the OS. I'd recommend this anyway on a new-to-you computer. -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting I'm a designated driver on the Information Super Highway -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On Feb 7, 2010, at 1:36 AM, Jonas Ulrich wrote: Is there something I can try to fix the graphics chip? What exactly is the problem? I think this is a problem with the VRAM or GPU. There used to be an extended warranty period for this issue, but it's over now. See: http://www.abysscomputer.be/telechargement/files/iMac%20G5%20Extension.pdf http://www.apple.com/support/imac/repairextensionprogram/ You might be able to plead with an Genius at an Apple Store, they repaired my G5 PowerMac for free even though a similar extended warranty period had expired. Here's a service that will reball the GPU for $75: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItemitem=250561977100 Perhaps it could be shimmed like the iBooks with similar GPU issues. I've heard a nice tight shim will virtually solve the issue in some iBooks? -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
Back in the old days of CRT monitors, which were much like television sets, I turned a monitor on one day, and it was all green and blue and flattened and looked very much like this, even though all colors seem to be here. They are not balanced as the should be. This looks like a problem in the circuit which controls the color balance for the screen. in some parts of the screen the color is gone, such as on the dialog window you have displayed. No red, green or yellow in the upper left and no pretty blue on display or the slider bar. I don't understand why you think this is not a screen problem. The screen shot will show what the screen is displaying, no matter the machine. I think you have a big problem with whatever circuit controls the display output. Just my opinion, and way too early for real thinking. Peace, Dennis in Victoria Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
A good way to test the screen and graphics card- connect an external monitor. If the image is corrupt on the external, the video card has a problem, otherwise, it's the screen. On Sun, Feb 7, 2010 at 1:36 AM, Jonas Ulrich jonasulrich3...@gmail.comwrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/7/10 2:51 AM, Dennis Myhand wrote: Back in the old days of CRT monitors, which were much like television sets, I turned a monitor on one day, and it was all green and blue and flattened and looked very much like this, even though all colors seem to be here. They are not balanced as the should be. This looks like a problem in the circuit which controls the color balance for the screen. in some parts of the screen the color is gone, such as on the dialog window you have displayed. No red, green or yellow in the upper left and no pretty blue on display or the slider bar. I don't understand why you think this is not a screen problem. The screen shot will show what the screen is displaying, no matter the machine. I think you have a big problem with whatever circuit controls the display output. Just my opinion, and way too early for real thinking. Peace, Dennis in Victoria A screen shot will show what the graphics processor is producing, not what the screen is showing. You can take a screen shot with NO screen attached. If the screen is distorting colors and such it will have no effect on a screen shot. That a screen shot reflects the same distortion as the screen indicates it's a malfunction in the graphics processor / memory. Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting I'm a designated driver on the Information Super Highway -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
What do you mean shimming the GPU? On Sun, Feb 7, 2010 at 10:52 AM, Clark Martin cm...@sonic.net wrote: On 2/7/10 2:51 AM, Dennis Myhand wrote: Back in the old days of CRT monitors, which were much like television sets, I turned a monitor on one day, and it was all green and blue and flattened and looked very much like this, even though all colors seem to be here. They are not balanced as the should be. This looks like a problem in the circuit which controls the color balance for the screen. in some parts of the screen the color is gone, such as on the dialog window you have displayed. No red, green or yellow in the upper left and no pretty blue on display or the slider bar. I don't understand why you think this is not a screen problem. The screen shot will show what the screen is displaying, no matter the machine. I think you have a big problem with whatever circuit controls the display output. Just my opinion, and way too early for real thinking. Peace, Dennis in Victoria A screen shot will show what the graphics processor is producing, not what the screen is showing. You can take a screen shot with NO screen attached. If the screen is distorting colors and such it will have no effect on a screen shot. That a screen shot reflects the same distortion as the screen indicates it's a malfunction in the graphics processor / memory. Jonas Ulrich wrote: Hi all, someone gave me this iMac the other day, and it has the dreaded graphics issue: Anything of a light color on the screen is distorted and has small lines and distorted pixels. (see picture) I've determined this is not a screen problem because I took a screen shot and opened it on another machine and saw the problem still. Here is what I've tried: Zapped pram Reset nvram Reset SMU Reinstalled the OS Cleaned inside and re seated all the cables. Checked capacitors, there is NO swelling or leaking Is there something I can try to fix the graphics chip? What exactly is the problem? Thanks in advanced! P.S It is the 2nd generation imac 20 with a 2.0GHZ G5 Processor. -Jonas -- Clark Martin Redwood City, CA, USA Macintosh / Internet Consulting I'm a designated driver on the Information Super Highway -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/7/2010 4:30 PM, Jonas Ulrich wrote: What do you mean shimming the GPU? My guess would be to cut out a shim to go around the non core portion of the GPU. When you bolt the heatsink back down, it will put pressure on top of the chip and sometimes make better electrical connection if there was a flaky connection. I had a video card that I shimmed at one point and it helped until I moved the case and made things worse. Believe it or not, I pulled the card apart and removed all plastics, baked that puppy in the oven at 375 degrees for 10 minutes to reflow the solder. Let it cool completely, reassembled the card and voila, card still works to this day without the need to be shimmed. If you decide to go the crazy route like I did, be sure to support the board with aluminum foil balls on a cookie sheet. Also remove any plastics and ESPECIALLY heatpipes if there are any. Those can explode with great vigor lol. Also, if you have non solid capacitors, aka standard capacitors, watch them closely as they can burst. When time is up, turn oven off and gently open door to vent heat and let it cool completely for about 30 minutes to an hour. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
On 2/7/2010 10:27 PM, Jason Brown wrote: On 2/7/2010 4:30 PM, Jonas Ulrich wrote: What do you mean shimming the GPU? My guess would be to cut out a shim to go around the non core portion of the GPU. When you bolt the heatsink back down, it will put pressure on top of the chip and sometimes make better electrical connection if there was a flaky connection. Forgot to mention, the shim that is generally used is made out of card stock. Like an index card or two on top of one another. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
Re: iMac G5 2GHZ Graphics Problem
FIXED! I shimmed the Graphics Chip using Pennies! I stacked them under the gray cover, and then on top of the cover and then closed the computer up and it works perfectly!!! Thanks for help, you saved my computer! -Jonas On Sun, Feb 7, 2010 at 8:28 PM, Jason Brown jason_br...@charter.net wrote: On 2/7/2010 10:27 PM, Jason Brown wrote: On 2/7/2010 4:30 PM, Jonas Ulrich wrote: What do you mean shimming the GPU? My guess would be to cut out a shim to go around the non core portion of the GPU. When you bolt the heatsink back down, it will put pressure on top of the chip and sometimes make better electrical connection if there was a flaky connection. Forgot to mention, the shim that is generally used is made out of card stock. Like an index card or two on top of one another. -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list -- You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs. The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to g3-5-list@googlegroups.com For more options, visit this group at http://groups.google.com/group/g3-5-list
