8. Using a 3 mm flathead hex driver, replace the six long processor mounting screws. 19. Using a 3 mm flathead hex driver, tighten the four captive float plate screws.
0. Reconnect the processor support bar cable with the processor cable. 21. Replace the processor support bar cable in the clip on the PCI divider. 22. Replace the processor inlet frame assembly on the front of the heatsink. Important: If you are replacing the processor with a new processor, be sure to use the inlet frame included with the replacement processor. 23. Replace the heatsink cover. 24. Replace the front inlet fan assembly.
Processor Support Bar and Cable Note: The illustrations in this procedure are based on the Power Mac G5 (Late 2005 Quad) computer. Although the Power Mac G5 (Late 2005 Dual) support bar cable differs from the Quad cable (it has two connectors rather than three), the take-apart procedure for all configurations is primarily the same. Tools The only tool required for this procedure is a Phillips #1 screwdriver.
Procedure 1. Remove the two mounting screws from the processor support bar. 2. Disconnect the processor support bar cable from the logic board. 3. Power Mac G5 (Late 2005 Quad): If necessary, remove the processor support bar cable from the clip on the PCI divider. 4. Lift the bar and attached cable straight up and out of the enclosure.
To remove the cable from the support bar: 1. Depress the two clips on either side of the front inlet fan connector and remove the connector from the support bar. 2. Unclip the cable from the support bar and remove the cable from the bar.
Front Panel Board Tools The only tool required for this procedure is a Phillips #1 screwdriver.
Procedure 1. Disconnect the power button cable from the front panel board. 2. Remove the two front panel board mounting screws. 3. Gently pull the board back from the front panel, tip the back of the board up so that it clears the DIMM slot ejectors, and remove the board from the enclosure.
Note: If you are replacing the front panel board with a new board, carefully remove the EMI shield from the original board and transfer it to the replacement board. Make sure that the fingers of the shield enclose the board as shown in the illustration below. Replacement Note: When replacing the front panel board, align the ports on the board with the openings in the front panel board. Then press the board firmly to the enclosure.
Power Button Tools The only tool required for this procedure is a jeweler’s flat-blade screwdriver.
Procedure 1. Lay the computer so that the front panel is facing down. 2. Remove the black rubber cap that covers the power button LED. 3. Using a jeweler’s flat-blade screwdriver, pry up the metal C-ring that secures the power button board. 4. Lift up and remove the power button board.
5. Remove the metal activation ring that lies below the power button board. 6. Remove the power button from the enclosure.
Logic Board Tools The following tools are required for this procedure: • Phillips #1 screwdriver • long-handled T-10 torx driver • 9/32-inch nut driver Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the following: • Front inlet fan assembly • Heatsink cover • Processor inlet frame (Dual 2.0/2.3 GHz) or Processor inlet frame (Quad) • Processor (Dual 2.0/2.
Part Location Power Mac G5 (Late 2005) Take Apart — Logic Board 113
Procedure 1. Disconnect the cables from the top and bottom edge of the logic board. 2. Using a long-handled T-10 torx driver, remove the nine power supply bus bar screws.
3. Using a 9/32-inch nut driver, remove the six logic board standoffs. 4. Using a Phillips #1 screwdriver, remove the three black logic board mounting screws. 5. Move the cables and processor power terminal assemblies out of the way. Then carefully slide the logic board to the left to release it from the three mushroom-head standoffs. 6. Tilt the logic board up and maneuver it out of the enclosure, making sure the ports clear the enclosure openings.
Note: Perform the following procedures only if you are replacing the logic board with a new logic board. 7. Transfer the following from the original logic board to the replacement board: • Memory DIMMs • Ambient board • Quadro FX 4500 graphics card cable (if installed) 8. Transfer the port EMI shield from the original logic board to the replacement logic board, making sure the shield is fully seated on the ports.
1. Temporarily tuck the top cables into the openings in the media shelf so that they are out of the way. Also tape or hold the bottom cables out of the way. Note: You may find a long strip of packing tape useful in securing the cables. 2. Angle the logic board into the enclosure so that the port edge goes in first. Warning: Be careful not to catch the battery on the edge of the case as you lower the logic board into the enclosure.
5. Replace the three logic board screws and six standoffs in the order indicated below. Important: There are two versions of the power supply, one with two processor power terminal assemblies and the other with just one processor power terminal assembly. In either case, make sure the rear standoffs are threaded through the power terminal rings before you insert the standoffs into the logic board.
6. Replace the nine power supply bus bar screws. 7. Reconnect all cables at the top and bottom edge of the logic board. 8. Replace the PCI divider. 9. Replace the front panel board. 10. Replace the speaker/fan assembly and reconnect its cables to the logic board. 11. Replace the PCI card guide. Note: If the computer includes a Quadro FX 4500 graphics card, you must connect the Quadro FX 4500 cable to the logic board before you replace the PCI card guide. 12.
Antenna Board and Cables Note: The antenna cables are permanently attached to the antenna board. The cables and board are removed from the enclosure as a unit. Tools The only tools required for this procedure are a Phillips #1 screwdriver and a flatblade screwdriver. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the following: • Front inlet fan assembly • Heatsink cover • Processor inlet frame (Dual 2.0/2.
Part Location Power Mac G5 (Late 2005) Take Apart — Antenna Board and Cables 121
Procedure 1. Remove the antenna cables from the tape on the inside of the enclosure’s side panel and from the channel between the PCI cage and the rear exhaust openings on the inside of the enclosure’s back panel. 2. Remove the three screws on the interior antenna board cover. Note: This procedure will also release the exterior antenna board cover on the back panel.
3. Using a flatblade screwdriver, pry up the interior antenna board cover and remove the cover from the enclosure. 4. Remove the antenna board from the slot in the exterior antenna board cover.
5. Remove the antenna board and cables from the enclosure. Note: If you are replacing the antenna board/cables with a new board/cables, transfer the grounding clip from the original antenna board to the replacement board. Replacement Note: Insert the antenna board into the slot in the exterior antenna board cover as illustrated.
Replacement Note: Be sure to reroute the antenna cables in the channel between the PCI cage and the rear exhaust openings on the inside of the enclosure’s back panel.
Power Supply Tools The only tools required for this procedure are a Phillips #1 screwdriver and 1/4-inch nut driver. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the following: • Front inlet fan assembly • Heatsink cover • Processor inlet frame (Dual 2.0/2.3 GHz) or Processor inlet frame (Quad) • Processor (Dual 2.0/2.
Part Location Power Mac G5 (Late 2005) Take Apart — Power Supply 127
Procedure 1. Position the computer so the power supply is at the top. 2. Using a Phillips #1 screwdriver, remove the two screws that secure the power supply top cover, and remove the cover from the enclosure. Note: On some power supply covers, a pad attached to the top of the cover hides the left screw. To access this screw, gently peel back the pad as illustrated. 3. Using a 1/4 inch nut driver, remove the mushroom-head standoff closest to the power supply.
4. Using the Phillips screwdriver, remove the four power supply mounting screws on the bottom of the enclosure. 5. Lift up the bus bar tabs to release them from the plastic runner on the enclosure.
6. Slide the power supply toward the front of the computer. 7. Tilt the bus-bar-tab edge of the power supply a short distance out of the bottom of the enclosure. (Make sure that the bus bar tabs are released from the plastic runner on the enclosure.) 8. Rotate the power supply up and remove it from the enclosure. Replacement Note: Make sure the plastic trim ring is in place in the power receptacle before replacing the power supply in the enclosure.
Replacement Note: To fit the power supply back into the enclosure, align the power supply so that it is parallel to the bottom panel and push the power supply straight back until the bus bar tabs snap into place. Then slide the power supply toward the back of the computer, making sure the power receptacle aligns with the opening in the back panel. Note: Make sure the power supply cables do not catch on the enclosure or under the power supply.
Air Deflector Sensor Board Tools The only tool required for this procedure is a flatblade screwdriver. A small mirror to use in locating the board is optional. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the following: • Front inlet fan assembly • Heatsink cover • Processor inlet frame (Dual 2.0/2.3 GHz) or Processor inlet frame (Quad) • Processor (Dual 2.0/2.
Part Location Power Mac G5 (Late 2005) Take Apart — Air Deflector Sensor Board 133
Procedure 1. Locate the air deflector sensor board inside the enclosure on the bottom right front corner of the frame. You may find a small mirror useful in seeing the board. 2. Disconnect the sensor cable from the air deflector sensor board. 3. Pry up the sensor board from the frame and remove the board from the enclosure. Note: Adhesive on the back of the board attaches the sensor board to the frame.
Service Source Troubleshooting Power Mac G5 (Late 2005) © 2005 Apple Computer, Inc. All rights reserved.
General Information DDR2 Memory The Power Mac G5 (Late 2005) has eight DIMM slots for PC2 4200, 533 MHz, Double-Data-Rate 2 (DDR2) SDRAM DIMMs. The slots are arranged in two banks of four slots each. Power Mac G5 (Late 2005) computers come with a minimum of 512 MB of RAM, installed as a pair of 256 MB DIMMs in the two center slots. Additional DIMMs can be installed in the open DIMM slots, as illustrated below. Note: DIMMs must be installed in equal-sized pairs from the center outward.
In the Power Mac G5 (Late 2005), DIMMs must fit the following specifications. Memory from older Macintosh computers is not compatible. PC2 4200, 533 MHz, DDR2 DIMMs • 240-pin module • Maximum number of memory devices on DDR2 SDRAM: 18 • Nonparity • Unbuffered (registered or buffered DDR2 SDRAM cannot be used) • Either error-correcting code (ECC) or no error-correcting code (NECC) modules • Note: Do not mix ECC and NECC memory modules within a pair.
Important: Combined maximum power consumption for all four expansion slots should not exceed 200 W. Combined maximum video RAM for all graphics cards is 1 GB. While all slots can accommodate PCI Express cards that have up to 16-lanes, if you install a card that requires a greater bandwidth than the slot provides, the card will operate at the bandwidth of the slot. For example, an 8x card installed in a 4x slot will operate as a 4x card. Refer to the following table for details.
3. Press the reset button on the logic board. Note: For the location of the reset button, see “Logic Board Diagram” in the Views chapter. 4. Replace the front inlet assembly and close the computer. 5. Turn on the computer. Power-On Self Test: RAM and Processor Verification A power-on self test in the computer’s ROM automatically runs whenever the computer is started up after being fully shut down (the test does not run if the computer is only restarted).
Diagnostic LED Table LED No 1 Description Color When Expected On Condition CPU A Red Off No 2 Overtemp LED Red No 3 Power On Red No 4 Trickle Power Yellow No 5 Open Firmware Good Green No 6 CPU B Red No 7 Checkstop Red LED “On” Indicates CPU A improperly installed Things to Check Is processor assembly seated properly? Check that mounting screws are properly tightened. Off CPU has Check that space gone is allowed for fans overtemp to ventilate. Verify fans and sensors are connected.
Power Supply Verification To power on, the computer’s logic board requires “trickle” power. If the system fails to power on, first reset the SMU (remove power cord for approximately two minutes). If the unit still doesn’t power on, follow the procedure outlined below to determine whether the issue is related to the power supply. Verify trickle power Diagnostic LED 4 indicates the presence of trickle power required by the logic board to begin the startup process.
Location of Bus Bar Tabs and Terminals Note: This is a top view of the main logic board with the processor module removed. You must test the voltages with the processor module installed. MLB Power Bus Bar Voltage Positive Lead Ground Lead 3.3 V Tab 1 Tab 4 5.1 V Tab 2 Tab 4 0V Tab 3 Tab 4 0V Tab 4 Tab 5 0V Tab 5 Tab 4 0V Tab 6 Tab 4 0V Tab 7 Tab 4 12 VDC Tab 8 Tab 4 12 VDC Tab 9 Tab 4 Nominal Min Max +3.3 VDC 3.14 VDC 3.48 VDC +5.1 VDC 4.85 VDC 5.35 VDC +12 VDC 11.
CPU Terminals CPU A Voltage Positive Lead Ground Lead 12 V Terminal 1 Terminal 2 0V Terminal 2 Tab 4 Nominal Min Max +12 VDC 10.8 VDC 13.2 VDC Voltage Positive Lead Ground Lead 12 V Terminal 1 Terminal 2 0V Terminal 2 Tab 4 Nominal Min Max +12 VDC 10.8 VDC 13.
Symptom Charts 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.
8. Verify that processors’ mounting screws are properly tightened. 9. Reseat front panel board. 10. Test whether the front panel board or power button is at fault. Remove the installed front panel board and swap it for a known-good front panel board. 11. Replace front panel board. 12. Replace power button. 13. Replace power supply. 14. Replace logic board. Power-on LED illuminates when pressed in, but goes out when button is released, there is no boot tone or video, but you can hear a small click 1.
Power-on LED illuminates when power button is pressed and fans spin continuously but there is no boot tone or video 1. Reseat video card. (Make sure video card is fully inserted in connector and end of card is secured by the connector latch.) For video cards that require power cables, check that they are connected. 2. Verify speaker cable is fully seated. 3. Reset logic board. Refer to “Resetting the Logic Board” in this chapter. 4. Check diagnostic LED 1 and LED 6 for processor connection 5.
Power-on LED illuminates, fans and processor pump run harder, there is no boot and the system shuts down within a few minutes 1. Remove the processor and look for loss of fluid on the absorbent liner on top of the power supply. If you see drops of fluid, replace the processor, otherwise go on to the next step. 2. Reseat the processor. 3. Replace the processor 4. Replace the logic board 5. Replace the power supply Fluid leak is suspected and the computer is plugged in 1. Unplug the computer 2.
Fans Individual fan failure 1. Replace fan Exception: The media blower located between the optical and hard drives cannot be replaced. You must replace the enclosure for this part. 2. Replace logic board All fans run at high speed 1. Check for proper ventilation around the exterior of the computer. 2. Check that the clear plastic air deflector is in place. 3. Run Apple Service Diagnostic (refer to “Thermal Calibration” earlier in this chapter). Processor fans run at high speed 1.
Other Failures Air deflector sensor 1. Reseat air deflector sensor board cable 2. Replace air deflector sensor board 3. Replace logic board Optical drive 1. Replace optical drive cable 2. Replace optical drive 3. Replace logic board FireWire port (front panel A) 1. Reseat front panel board 2. Replace front panel board 3. Replace logic board Firewire port (rear A<->B) Replace logic board Firewire port (rear B<->B) Replace logic board Internal speaker 1. Check speaker cable connection 2.
Combo Card 1. Reseat antenna cables connected to Combo card 2. Replace Combo card 3. Replace antenna card 4. Replace logic board Audio IO (front headphones) 1. Reseat front panel board 2. Replace front panel board 3. Replace logic board Audio IO (rear audio line in; rear audio line out) 1. Check Sound settings in System Preferences 2.
Service Source Upgrades Power Mac G5 (Late 2005) © 2005 Apple Computer, Inc. All rights reserved.
AirPort Extreme/Bluetooth Combo Card and Runway Card Note: The combo card is connected to an adapter card called the runway card. This procedure includes steps for installing both the combo and runway cards. Tools The only tool required for this procedure is a jeweler’s Phillips #0 screwdriver. Preliminary Steps Before you begin, open the computer, lay it on its side with the access side facing up, and remove the front inlet fan assembly.
Procedure 1. Holding the runway card by the top edges, insert the card into its connector on the logic board. 2. Secure the runway card to the PCI divider by inserting the outer casings for the two black mounting rivets into the two holes at the top corners of the card. Then insert the center plugs for the rivets.
3. Attach the two antenna cables to the connectors on the underside of the combo card. Note: The cables can attach to either connector on the card. 4. Connect the combo card to the runway card. 5. Using a jeweler’s Phillips screwdriver, install the two combo card mounting screws. 6. Connect the combo card antenna cables to the clip on the side of the PCI divider. 7. Replace any DIMMs you removed earlier. 8. Replace the front inlet fan assembly.
Service Source Views Power Mac G5 (Late 2005) © 2005 Apple Computer, Inc. All rights reserved.
Exploded Views Exploded View 1 PCI Divder 922-7096 Heatsink Cover 922-6951 Dual 2.0 Processor 661-3727 Dual 2.
Exploded View 2 Video Card GeForce 6600 LE 661-3730 GeForce 6600 661-3731 Quadro FX 4500 661-3732 GeForce 7800 GT 661-3835 SuperDrive 661-3736 Speaker/ Fan 922-7027 Hard Drive 160 GB 661-3733 250 GB 661-3734 500 GB 661-3735 Dual 2.0/2.
Screw Matrix Screw Matrix 922-2739 922-5846 5 10 15 20 mm 5 922-5974 10 15 20 mm 5 922-6024 5 10 15 mm 5 10 15 20 mm 5 922-6252 5 10 15 20 5 10 15 5 10 10 20 mm 5 922-6306 15 20 mm 20 15 mm 15 mm 922-6253 mm 922-6305 10 15 922-6035 20 922-6169 Screw Matrix 922-5972 10 20 922-6532 20 mm 5 10 15 20 mm 5 10 15 20 mm Power Mac G5 Views - 3 Power Mac G5 (Late 2005) Views 158
Screw Matrix 922-6939 922-6946 5 10 15 20 mm 5 922-6949 10 15 20 mm 5 922-7089 5 10 15 mm 5 10 15 20 mm 5 922-7133 5 5 10 10 15 20 mm 10 15 20 mm 922-7134 20 mm 5 15 10 15 922-7107 20 922-7124 Screw Matrix 922-6947 10 20 mm 5 10 15 20 mm 5 15 10 20 mm 5 10 20 15 mm 15 mm 20 Power Mac G5 Views - 3 Power Mac G5 (Late 2005) Views 159
Internal Views Overview Optical Drive Top Hard Drive Bay Bottom Hard Drive Bay DDR2 SDRAM Slots Slots 2–4: PCI Express Battery Slot 1: PCI Express Graphics (graphics card installed) Power Mac G5 (Late 2005) Views 160
Logic Board Optical Digital Audio Out Port FireWire 400 Port Optical Digital Audio In Port FireWire 800 Port Audio Line-Out Port Gigabit Ethernet Ports (2) Audio Line-In Port USB 2.
External Views Front View Optical Drive Status Light f Headphone Jack ® Power Button FireWire 400 Port USB 2.
Rear View Latch DVI Display Port 2 Integrated Bluetooth and AirPort Antenna FireWire 800 Port FireWire 400 Port - Audio Line-Out Port , Audio Line-In Port Access Covers for PCI Express Expansion Slots DVI Display Port 1 G Gigabit Ethernet Ports (2) Optical Digital Audio Out Port Optical Digital Audio In Port USB 2.
