Warning Dont press on the end of the heatsink or youll damage the processor

Note For steps 16-19, replace or tighten the screws in the order indicated in the illustrations. 16. Using a 4 mm ballhead hex driver, tighten the four captive screws near the middle of the processor. 17. Using a 3 mm flathead hex driver, replace the four short screws that mount the two processor terminal assemblies. 18. Using a 3 mm flathead hex driver, replace the six long processor mounting screws. 18. Using a 3 mm flathead hex driver, replace the six long processor mounting screws. 20....

Other Failures

Reseat air deflector sensor board cable 2. Replace air deflector sensor board Firewire port (rear A< -> B) Replace logic board Firewire port (rear B< -> B) Replace logic board 1. Check speaker cable connection 2. Replace speaker fan assembly USB 2.0 (rear ports) Replace logic board 1. Reseat antenna cables connected to Combo card Audio IO (rear audio line in rear audio line out) 1. Check Sound settings in System Preferences

Startup Failures

When testing a computer for the following symptoms, remove the side access panel so you can better observe or listen for fan movement. Note Be sure to check the DDR Memory and Power-On Self Test topics in the General Information section of this chapter. Incorrect installation of DIMMs or incompatible memory will not allow the system to start up correctly. For information on how to correctly install DIMMs, see the Memory (DIMMs) topic in the Take Apart chapter. Power-on LED does not illuminate...

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...

Memory DIMMs

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...

PowerOn 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 . If the test detects a problem, the status LED located above the power button on the front of the computer will flash in the following ways 1 Flash No RAM is installed or detected. 2 Flashes Incompatible RAM types are installed or RAM installed in wrong slots. 3 Flashes No RAM banks passed memory testing. 4 Flashes...

Graphics CardPCI Express HI Card

Power Mac G5 Late 2005 computers have four expansion card slots that accommodate PCI Express cards. The computers come with a high-performance 16-lane 16x PCI Express graphics card installed in slot 1. The card contains the graphics processor unit GPU and provides the computers' display ports. You can install additional PCI Express cards in slots 2-4. Install a second card in slot 3, a third in slot 4, and a fourth in slot 2 to take advantage of the bus bandwidth of each slot. Before installing...

Version Processor

Note For steps 3-6, remove or loosen the screws in the order indicated in the illustrations. For Version 2 of the processor, see steps 8-12. 3. Using a 3 mm flathead hex driver, loosen the four captive float plate screws. Do not remove the captive screws from their standoffs. 4. Using a 3 mm flathead hex driver, remove the six long processor mounting screws. 4. Using a 3 mm flathead hex driver, remove the six long processor mounting screws. 5. Using a 3 mm flathead hex driver, remove the four...

Part Location

Disconnect the cables from the top and bottom edge of the logic board. 1. Disconnect the cables from the top and bottom edge of the logic board. 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...

Overview

Drive Bay Mac

Media Fan Connector Media Blower Connector Optical Drive Connector Speaker Connector Processor Support Bar Cable Connector Media Fan Connector Media Blower Connector Processor Connector B Connector present on Quad only Processor Connector B Connector present on Quad only

Tools

Using a jeweler's Phillips screwdriver, remove the two combo card mounting screws. 2. Disconnect the combo card antennas from the clip on the side of the PCI divider. 3. Disconnect the combo card from the runway card and lift up a short distance. 4. Disconnect the two antenna cables from the card and remove the card from the enclosure. Replacement Note The cables can attach to either connector on the card. To remove the runway card after removing the combo card , do the following Note The...

Exploded View

Power Supply For Power Mac

Power Supply 710 W 661-3737 1 KW 661-3738 GeForce 6600 LE 661-3730 GeForce 6600 661-3731 Quadro FX 4500 661-3732 GeForce 7800 GT 661-3835 Hard Drive 160 GB 661-3733 250 GB 661-3734 500 GB 661-3735 Dual 2.0 2.3 Rear Exhaust Fan 922-7086 Quad Rear Exhaust Fan 076-1047 and 922-6033 Power Supply 710 W 661-3737 1 KW 661-3738

Power Cord

Powermac 2005

The power cord for the Power Mac G5 Late 2005 is a heavy-duty cord that is specific to this model. The Power Mac G5 Late 2005 power cord accommodates the computer's more powerful power supply. Power cords from earlier Power Mac G5 models are not compatible and will not fit the power cord socket on the back of the Power Mac G5 Late 2005 computer. Therefore, to supply power for troubleshooting or testing a Power Mac G5 Late 2005 computer, you must make sure you have on hand its specific power...

Special CompTIA Code

Apple has created the following CompTIA code to use for repair on Power Mac G5 Late 2005 computers eligible under the Power Mac G5 Late 2005 REP for Power Supply Issues. Use CompTIA Code 663 PMG5 Late 2005 Power Supply REP when replacing a power supply under the Power Mac G5 Late 2005 REP, whether or not the computer is covered by warranty or an extended service agreement. Service providers in Japan who create a mail-in repair for Power Mac G5 Late 2005 computers eligible under the Power Mac G5...

Remove the processor heatsink cover

Using an ohm meter, measure the resistance across Terminal 1 and Terminal 2 for CPU A. Refer to the Power Supply Verification photo for terminal locations. Hold the meter's probes on the terminals for 5 seconds minimum. Nominal resistance readings should be above 200 ohms. If the resistance is below 10 ohms, replace the power supply. 5. Check for trickle voltage from the power supply. Refer to Power Supply Verification in this chapter. If verification fails, replace power supply. 6. Verify...

Power Mac G5 Late 2005

Powermac Remove Top Shelf

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 on a Power Mac G5 Late 2005 Quad computer, 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. Then...

Replacement Parts

The only part eligible to be replaced under this repair extension program is the 1 KW AcBel power supply, part number 661-3738. Power Mac G5 Late 2005 computers with quad 2.5 GHz processors must use the 1 KW power supply as the replacement part. However, if you are repairing a 1 KW power supply in a Power Mac G5 Late 2005 computer with either dual 2 GHz or dual 2.3 GHz processors, you may use the 710 W power supply, part number 661-3737, as the replacement part. The following table shows the...

Warning Dont press on the top of the heatsink or youll damage the processor

Power Warning This Heatsink

Note For steps 3-6, remove or loosen the screws in the order indicated in the illustrations. 3. Insert a long-handled 4 mm ballhead hex driver into the two holes on the top of the heatsink and tighten the two captive screws. 4. Using a long-handled 3 mm flathead hex driver, replace the two short screws that mount the power supply terminal. 5. Using a long-handled 3 mm flathead hex driver, replace the four long processor mounting screws. 6. Replace the processor inlet frame on the front of the...

Quadro FX graphics card cable if installed

Powermac Thermal Recalibration

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. Important Before you install a replacement logic board, remove the protective clips and caps circled in the illustration below and transfer them to the logic board you are returning to Apple. Do not remove the mylar sheet from the board. 1. Temporarily tuck the top cables into the openings in the media shelf so that they are out of the way. Also tape...

Resetting the Logic Board

Some system problems can be resolved by resetting the System Management Unit SMU microcontroller chip on the Power Mac G5 Late 2005 logic board. To reset the logic board, do the following 2. Unplug the computer from its power source. 4. Plug the power cord back in, and turn the computer on. If the computer does not power on, there is something else wrong with it refer to the Startup Failures section of Symptom Charts in this chapter. You can also reset the logic board by pressing the SMU reset...

Mac G5 Back Antenna

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. 5. Remove the antenna...

Power Mac G5 Light Sensor

Mac Pro Air Deflector

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.

G5 Front Inlet Fan Connector

Mac Pro Front Fan Assembly

Hold the front inlet fan assembly by the front handle and firmly pull it out of the computer. 1. Hold the front inlet fan assembly by the front handle and firmly pull it out of the computer. Replacement Note To replace the front inlet fan bracket in the enclosure, align the large rail on the bracket with the cutout in the PCI divider and press firmly. Important Make sure the connector on the fan fully engages the fan connector on the logic board, or the computer will not operate properly....

Processor inlet frame Dual GHz

How Remove Fan Assembly Power Mac

Using a long-handled 3 mm flathead hex driver, remove the six processor mounting screws. Four long screws mount the upper platform and two short screws mount the power supply terminal on the level below. 2. Insert a long-handled 4 mm ballhead hex driver into the two holes on the top of the heatsink and loosen but do not remove the two captive screws. 3. Holding the processor heatsink by the bottom metal platform, lift the assembly straight up out of the enclosure. Warning The heatsink and...

Eligible Products

Power Mac Label

The program is available for Power Mac G5 Late 2005 computers that were sold between approximately October 2005 and August 2006 and have a 1 KW AcBel power supply. Eligible computers must meet the following conditions The computer exhibits one of the symptoms described in Program Overview. The computer's serial number falls within a specific range. The power supply label lists AcBel as the manufacturer. To identify an eligible Power Mac G5 Late 2005 computer, first check the computer's serial...

Diagnostic LED Table

Is processor assembly seated properly Check that mounting screws are properly tightened. Remove processor assembly and check for damaged pins on processor connector or logic board connector. Replace processor, if necessary. Replace logic board, if necessary. Check that space is allowed for fans to ventilate. Verify fans and sensors are connected. Reseat front inlet fan. Run Thermal Calibration in Apple Service Diagnostics. Replace processor. Check connections to the power bus bar. Check...

DDR 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. The SDRAM DIMMs must be installed in pairs with one DIMM per bank. equal-sized pairs from the center outward. equal-sized...

Procedure

Disassemble Mac Battery

If necessary, carefully spread the two tabs holding the battery. 2. Remove the battery from its holder. Replacement Note Insert the new battery in the holder, making sure the battery's negative symbol - faces up. Warning Installing the battery incorrectly may cause an explosion. Be sure the battery's positive and negative sides are correctly oriented in the holder. Use only the same type of battery or an equivalent recommended by the manufacturer of the original. Important Batteries contain...

Thermal Calibration

To ensure proper fan and temperature control in the Power Mac G5 Late 2005 , you must run Apple Service Diagnostic whenever you replace a processor or logic board with a new processor or logic board. Apple Service Diagnostic for Power Mac G5 is available as a download from http www.info.apple.com discimages . Note The calibration process of Apple Service Diagnostic requires a controlled environment to ensure accurate ambient temperature readings. Computers under test must have the transparent...

Differentiating the Power Mac G Late

Dual Ports

While Power Mac G5 Late 2005 computers look similar to earlier Power Mac G5 models, you can easily differentiate the Power Mac G5 Late 2005 by checking the back panel. Power Mac G5 Late 2005 computers include two Gigabit Ethernet ports and three USB 2.0 ports, as illustrated below. Earlier models include just one Gigabit Ethernet port and two USB 2.Q ports.

Procedure for Nvidia Quadro FX Card and Cable

Quadro 4500

To remove the Quadro FX 4500 card, do the following 1. Remove the two screws that mount the card to the enclosure. 2. Disconnect the Quadro FX 4500 cable from the card. 3. Holding the card by the top corners, gently pull up the card and remove it from its expansion slot. Replacement Note When replacing the Quadro FX 4500 card, position the card over the slot by carefully aligning the end of the card in the first slot in the PCI card guide and the two screw holes in the card fence with the first...

Heatsink For Powermac

Power Mac Removal Dual Processor

Note The combo card's runway card is attached to the PCI divider by two black rivets. Before you can remove the card from the PCI divider, you must remove both rivets and disconnect the card from the logic board. You do not, however, have to remove the runway card or combo card from the enclosure. 1. Using a Xacto knife, pry up and remove the center of the first black rivet that mounts the runway card to the PCI divider. 2. Pry up and remove the outer casing for the rivet. 3. Repeat steps 1 and...

Gotchas

Serial Number Power Mac

Although the Power Mac G5 Late 2005 computer looks similar to earlier Power Mac G5 models, there are a number of significant service and support differences. Before troubleshooting or servicing a Power Mac G5 Late 2005 , make sure you are familiar with the following points. DDR2 memory The Power Mac G5 Late 2005 computer uses both ECC and NECC DDR2 DIMMs. Refer to DDR2 Memory in the Troubleshooting chapter for more information about identifying and installing these DIMMs. PCI Express expansion...

Procedure for All Cards Except Nvidia Quadro FX

Pci Express Locking Clip

Install other PCI Express cards in the slots labeled 2, 3, and 4. Warning When removing or installing a card, handle it only by the edges. Do not touch its connectors or any of the components on the card. Lift the card straight out from the connector to remove it, and insert it straight into the connector to install it. Do not rock the card from side to side and don t force the card into the slot. Once the replacement card is installed, pull on it gently to...