Part Location

Disconnect the fan cable from the logic board. Note Press the cable connector up toward the media shelf when disconnecting the cable. 2. Press down on the two tabs on the top of the fan bracket to release the two latches. 3. Lift the fan bracket and fans out of the enclosure. 4. If you are replacing the fans, use needlenose pliers to pull each fan off the four grommets that mount it to the bracket, and remove the fans and cable from the bracket. Replacement Note When reinstalling the fan...

Power Mac G June Poweron LED illuminates when pressed in but goes out when button is released fans spin and there is no

Verify that the processors are properly seated. 2. Verify that the processors' mounting screws are properly tightened. 3. Remove the processors and check for damage to the logic board under the processors. If you see damage (see example below), replace the logic board. Note For the Power Mac G5 (June 2004 Dual 2.0 GHz), go to step 5. For single-processor computers, go to step 6. 4. Remove lower processor. If the computer starts up correctly, go to step 5. Otherwise, go to step 6. 7. Check for...

Liquid Cooling System LCS

The Power Mac G5 June 2004 Dual 2.5 GHz Early 2005 Dual 2.7 GHz configurations use a liquid cooling system LCS to manage the temperature in the computer. The liquid cooling system is sealed and is designed to be opened only by an Apple Authorized Service Provider AASP . To ensure proper safety and handling of the LCS system, please read the following information. General Safety Information The LCS cooling system fluid is predominantly water 80 or greater with a mixture of corrosion inhibitors,...

Power Supply Verification

To power on, the computer's logic board requires a trickle power of 5V. If the system fails to power on, first reset the PMU. Then follow the procedure outlined below to determine whether the problem is related to the power supply. Note To verify the power supply, you need a volt meter. 1. Remove the power cord from the computer. 2. Open the computer, lay it on its side with the access side facing up. 3. Remove the front inlet fan assembly. 4. Remove the black plastic cap covering the 24-pin...

Replace Processor Powermac G5

Power Mac Processor Removal

Note If you have an original Power Mac G5, skip step 1 and go directly to step 2. 1. Tilt the processor inlet frame to the left and then up to unlatch the plastic piece from the heatsink. Note The processor in this procedure is secured by four screws requiring either a longhandled Phillips screwdriver or a long-handled 2.5 mm hex wrench, depending on the model. To determine which tool to use, check the head of the screw in the unit you are repairing. 2. If the processor mounting screws have a...

Take Apart

General Information 21 Orientation 21 Tools 21 Parts Requiring Enclosure Replacement 21 Take Apart Procedures 22 Memory DIMMs 44 AGP PCI Card 47 AirPort Extreme Card 51 Battery 53 PCI Card Guide 55 Speaker Fan Assembly 57 Modem Power Mac G5, Power Mac G5 June 2004 Dual 1.8 GHz 60 Soft Modem Power Mac G5 June 2004 Dual 2.0 2.5 GHz , Power Mac G5 Early 2005 62 Heatsink Cover Power Mac G5 June 2004 Early 2005 68 Processor Power Mac G5, Power Mac G5 June 2004 Dual 1.8 2.0 GHz , Power Mac G5 Early...

Front Panel Board Troubleshooting

Certain no power symptoms can sometimes be caused by a failed front panel board or power button. However, troubleshooting these parts by swapping them out with known-good parts can be time-consuming. An alternative approach is to build a simple front panel board troubleshooting tool, as illustrated, and then use the procedures described below to test the board and button before actually replacing them. The tool consists of a known-good front panel board, with a known-good power button and front...

Pc Exploded Diagram

Power Mac Exploded Diagram

Super Drive 661-3552 Combo Drive 661-3550 Front Inlet Fans 076-1046 Inlet Fan Bracket, Dual 922-6031 661-3332 NVIDIA GeForce 6800 Ultra DDL Serial ATA Hard Drive 160GB 661-3547 250GB 661-3548 400GB 661-3549 Front Inlet Fans 076-1046 Inlet Fan Bracket, Dual 922-6031 Serial ATA Hard Drive 160GB 661-3547 250GB 661-3548 400GB 661-3549 Power Supply 450W 661-2903 600W 661-3234 Power Supply 450W 661-2903 600W 661-3234 Dual 2.0 GHz 661-3586 Dual 2.3 GHz 661-3587 661-3543 Dual 2.0 GHz 661-3584 Dual 2.3...

Poweron LED illuminates when power button is pressed and fans spin continuously but there is no boot tone or video

Make sure video card is fully inserted in connector and end of card is secured by the connector latch. 2. Verify speaker cable is fully seated. 3. Reset logic board. Refer to Resetting the PMU on the Logic Board in this chapter. Note For the Power Mac G5 June 2004 Dual 2.0 GHz and Power Mac G5 Early 2005 , go to step 5. 4. Remove lower processor if installed . If the computer starts up correctly, go to step 5. Otherwise, go to step 7.

Resetting the PMU on the Logic Board

The PMU Power Management Unit is a microcontroller chip that controls all power functions for this computer. The PMU is a computer within a computer. Its function is to tell the computer to turn on, turn off, sleep, wake, idle, etc. manage system resets from various commands. maintain parameter RAM PRAM . manage the real-time clock. Important Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the...

LS PCI Divider Power Mac G I June Early

Note Most Power Mac G5 June 2004 Early 2005 computers route the antenna board cables and modem filter board cable on the underside of the logic board. However, some Power Mac G5 June 2004 Dual 1.8 GHz computers route the antenna board and modem filter board cables on the top of the logic board. If the PCI divider in the Power Mac G5 June 2004 Dual 1.8 GHz you are repairing routes the cables on the top of the board, see the previous procedure for PCI Divider Power Mac G5.

Preliminary Steps

Before you begin, open the computer, lay it on its side with the access side facing up, and remove the following Processor s for Power Mac G5 without LCS Heatsink or Processor for Power Mac G5 with LCS Heatsink Memory DIMM if it is in slot next to the power supply cable Power supply for Power Mac G5 without LCS Heatsink or Power supply for Power Mac G5 with LCS Heatsink 1. Locate the modem filter board on the logic board. 2. Remove the screw that secures the metal cover to the modem filter...

Exploded View

Powermac Technical Drawing

Video Card 661-3545 ATI Radeon 9600 661-3593 ATI Radeon 9650 661-3332 NVIDIA GeForce 6800 Ultra DDL 661-3594 ATI Radeon X850 XT Inlet Frame 922-6393, Delphi 922-6394, Panasonic Processor, LCS Dual 2.7 GHz 661-3588 Inlet Frame 922-6393, Delphi 922-6394, Panasonic Processor, LCS Dual 2.7 GHz 661-3588

Block Diagram

Firewire 800 Block Diagram

The architecture of the Power Mac G5 computer is based on the PowerPC G5 microprocessor and two custom ICs the U3 memory controller bus bridge and the K2 I O controller. FireWire 400 port front FireWire 400 port rear FireWire 800 port rear Analog line-in Analog line-out Headphone jack Optical audio in S PDIF Optical audio out S PDIF FireWire 400 port front FireWire 400 port rear FireWire 800 port rear To ensure proper fan and temperature control in the Power Mac G5, you must run Apple Service...

Memory DIMMs

Adding Dimms

Depending on the model, Power Mac G5 computers have either four or eight Dual Inline Memory Module DIMM slots arranged in two banks. The slots accept Double-Data-Rate DDR Synchronous Dynamic Random-Access Memory SDRAM devices. The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB DIMMs installed in slot 1 of each DIMM bank. You can add DIMMs, provided they are installed in pairs of equal size, one per bank, from the center outward. A diagram marked on the logic board...

How to Use the Symptom Charts

The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the product. Because cures are listed on the charts in the order of most likely solution, try the cures in the order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. Note If a cure instructs you to replace a module, reinstall the original module before you proceed to the next cure. Important The only way to shut off power...

DDR Memory

Power Mac All Scheme Cable Inside

In the Power Mac G5, DIMMs must be installed in pairs of equal size and speed. Use PC2700 DDR-SDRAM for 4-DIMM-slot computers and PC3200 DDR-SDRAM for 8-DIMM-slot computers. Memory from older Macintosh computers is not compatible. Do not try to install non-DDR memory as it will not fit in the DIMM slots and could cause damage. Important Power Mac G5 June 2004 Early 2005 computers support only 184-pin, 2.5 volt, DDR400-compliant PC3200 DRAM DIMMs with a maximum of 4 GB or 8 GB depending on the...

Mac G5 Change Battery

Cup Hook Remove Locking Rivet

Locate the locking rivet that secures the processor heatsink cover to the PCI divider. 2. Using a mat knife or Xacto knife, pry up and remove the plug at the center of the locking rivet. Warning If you are not certified to service this product, removing the rivet will void the computer's warranty. Replacement Note For Power Mac G5 June 2004 Dual 1.8 2.0 GHz and Early 2005 Dual 2.0 2.3 GHz computers, you do not need to replace the rivet after you have replaced the heatsink cover. For Power...

Liquid Cooler Disassembly

Liquid Cooled Disassembly Guide

Tilt the processor inlet frame to the left and then up to unlatch the plastic piece from the heatsink. Note The processor in this procedure is secured by eight screws requiring a long-handled 2.5 mm hex wrench. 2. Loosen the four hex screws marked below, but do not remove them from their standoffs. 3. Loosen the four remaining hex screws but do not remove them from their standoffs. 3. Loosen the four remaining hex screws but do not remove them from their standoffs. 4. Hold the heatsink by...