Removing the Glass Panel

Apple strongly recommends wearing clean lint-free gloves whenever handling the glass panel. The gloves protect the glass panel from body oils, dirt, and other contaminants. Put on a pair of clean gloves with the rubberized-side of the gloves on the palm side of your hand. 2. Position the computer on the rear cover, on a soft protective lint-free surface, with the stand facing you 3. Clean off the suction cups, making sure they are free of contaminants. It may be necessary to wash the suction...

Replacing the IR Board

Connect the IR cable to the IR board. 2. Install the IR board and T6 screws. 3. If removed, connect the IR cable to the logic board. 4. Tuck the IR cable under the black plastic cable guide. 6. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.

Replacing the LVDS Cable

Connect the LVDS cable to the rear of the display panel. 3. On the rear of the panel, connect the inverter cable to the inverter board. Cover the cable and connector with the sticky, black mylar tape. 4. Lower the display into the rear housing. 5. Connect the other end of the inverter cable to the power supply. 6. Connect the LVDS cable to the logic board. Replace the two T6 screws. 7. Connect the LCD temp sensor cable to the bottom left corner of the logic board. Tuck any extra length of the...

Removing the Front Bezel

Place the computer on a soft protective lint-free surface such as a very clean ESD mat to avoid damaging the finish on the stand or rear housing. 2. Position the computer on the rear cover with the stand facing you. 2. Position the computer on the rear cover with the stand facing you. 4. With the upper corners loosened, lift up but do not remove the bezel. 4. With the upper corners loosened, lift up but do not remove the bezel. 5. Notice the connected microphone cable at the top of the bezel....

LVDS Display

With the display face down on a soft cloth, peel up the three pieces of black mylar tape from the LVDS cable on the back of the display panel. 2. Press in on the LVDS connector lock release clips (1) and gently pull (2) to disconnect the LVDS cable from the back of the panel. 3. Lift the LVDS cable from the display panel. 3. Lift the LVDS cable from the display panel.

Removing the Memory

Shut down the computer, and disconnect all cables including the power cord. 2. Holding the sides of the computer, lay it face down on a soft, clean cloth so the stand is facing you. 3. After removing the access door, touch the metal stand or bezel to discharge any static electricity from your body. Important Always discharge static before you touch any parts such as the memory board. To avoid generating static electricity, do not walk around the room until you have finished replacing the...

Cleaning Tool Resources

MCM Portal http www.mcmb2b.com appleasp 2. LENSPEN www.lenspen.com, the LapTop Pro or the VidiMax are very effective in removing fingerprint smudges on the LCD and on the inside surface of the glass. 3. iKlear distributors iKlear International dealer listing iKlear US Canada dealer listing 4. Japan Pleiades Digital Communications, Inc.www.pleiadesdesigns.co.jp 5. Brillianize is an alternative cleaning solution http www.brillianize.com Brillianize products are listed here Brillianize dealer...

Part Location

Remove the T10 screw from the right speaker. Replacement Note The shorter of the two speaker mounting screws is used to secure the right speaker the longer screw secures the left speaker. 1. Remove the T10 screw from the right speaker. Replacement Note The shorter of the two speaker mounting screws is used to secure the right speaker the longer screw secures the left speaker. 3. Pull it up and out of the computer assembly. 3. Pull it up and out of the computer assembly. 1. Install the...

Required Special Tools

Special tools are required to remove, handle, and clean the glass panel such as the following. These are available as a starter kit too. View the tools in the Glass Panel take apart chapter. 1. 922-8252 Suction cups, Pkg. of 2 2. 922-8261 Sticky silicone roller 6-inch to clean the glass panel 3. 922-8262 Sticky sheet pads to clean the silicone roller 4. 922-8263 Polishing cloths, clean, anti-static, optical grade micro fiber terry style cloth 5. 922-8253 Gloves, lint-free, anti-static, Pkg. of...

Handling a Broken Glass Panel

The glass panel is not tempered and will break into sharp pieces if mishandled. If the glass is broken it must be carefully removed from the Mac to prevent irreparable damage to the front surface of the LCD. If the front surface of the LCD is scratched by the broken glass the LCD may need to be replaced. Do not handle broken glass unless you are wearing protective cut-resistant gloves.The lint-free gloves used to prevent contamination of the glass panel are not suitable for handling broken...

Cleaning and Handling the Glass Panel

Follow the cleaning procedures in this manual to ensure the glass panel is free of dust and other particles before returning the computer to the customer. Note To view the movie, make sure the manual is opened in Acrobat. The iMac 24-inch Early 2008 model has a glass panel that attaches to the outside of the front bezel. The glass panel is not tempered and will break into sharp pieces if mishandled. A scratched or broken glass panel is not covered under warranty. Removing the glass panel...

Take Apart

General Information 9 What's New 9 Product Configurations 10 Opening the Computer 10 Note About Images in This Manual 10 General Tools 11 Required Special Tools 11 View of the iMac with the Front Bezel Removed 13 View of the Modules with the Display Panel Removed 13 View of the Rear Housing and Cables 14 Back View 14 I O Ports 15 Cleaning and Handling the Glass Panel 16 Cleaning and Handling the Glass Panel 26 Isopropyl Alcohol IPA 27 Cleaning the Silicone Roller 27 Do's and Don'ts 27 Metal...

Product Configurations

To confirm the configuration from the Apple menu, choose About This Mac. The Processor listing will show the speed of the processor followed by the processor type. The following table shows the iMac 24-inch Early 2008 model configuration at introduction 2 GB 2 x 1 GB 800 MHz DDR2 4 GB max 24 wide 1920 x 1200 94.1 ppi IPS 400 nits, 14 lamps, glossy Combo digital analog in, Combo digital heaphone out, Mic, Stereo speakers, 4 channel audio

Removing the Display Temp Sensor and Sensor Cable

Display Inverter Includes Mylar Shield

Peel back any kapton tape securing the sensor cable to the panel. 2. Carefully peel back the black insulator on the right side of the panel to access the entire sensor cable. 3. On the top right corner of the panel, peel back the mylar tape and foam gasket covering the temp sensor. Disconnect the display temp sensor cable from the sensor. Note Use a black stick to pry the sensor from the top of panel. l. Connect the LCD temp sensor cable to the sensor at the top of the panel. Place the foam...

Replacing the Glass Panel

Sticky Silicone Roller Imac

Put on a pair of clean gloves with the rubberized-side of the gloves on the palm side of your hand. 2. Install the LCD display panel onto the computer if it was removed. 3. Replace the font bezel if it was removed, connect the microphone cable and replace the bezel screws. 4. Locate the sticky silicone roller and the dust removal pad. Remove the protective covering on the silicone roller and peel the protective cover off the dust removal pad. 5. Holding the sticky paper with your free hand,...

Removing the Access Door

Disconnect all cables and the power cord from your iMac. 2. Place a soft, clean towel or cloth on your work surface. Hold the side of the iMac and lay it down so that the screen is against the surface and the bottom is facing you. 3. Raise the stand and use a Phillips 2 screwdriver to loosen the captive screw on the memory access door by turning it counterclockwise. Important When removing and installing the RAM access door it is important that you use the correct size Phillips screwdriver....

Product Introduced April

New images, screws, and updated text were added to the following sections Apple Hardware Test AHT error code table was added that lists the code and the suspect part Logic board photo showing sensor and fan locations front and back Diagnostic LEDs new photo of LEDs Added Cleaning Tools for the LCD and Glass section Added LensPen Cleaning Tool information Updated symptoms throughout for clarity and removed irrelevant links Added new troubleshooting sections called Wireless Issues and Additional...

Dos and Donts

Handle glass panel using lint free gloves. Use only a sticky silicone roller to clean the inside surface of the glass and the LCD panel. Use iKIear ONLY on the outside surface of the glass panel or use the LENSPEN. Place the glass panel into a clean protective microfoam bag when it is not installed on an Mac. Store the glass panel in a safe area where it will not be broken or damaged. Store the LCD panel in an anti-static bag to prevent the buildup of static charges which may attract dust...

Imac Power Supply 24 Inch

Warning HIGH VOLTAGE The AC DC power supply PCB remains powered up whenever the system is plugged in, whether or not the system has been turned on. Use extreme caution Wwhen troubleshooting the system with the front bezel removed. W J Don't work alone. In the event of an electrical shock it is important to have another individual present who can provide assistance. Keep one hand in your pocket when working on any iMac system that is plugged in. This will help ensure that your body does not...

Installing a Replacement Glass Panel

Imac Glass Smudge

Note Fewer dust particles will settle on the LCD panel with the computer in the vertical position. 2. Roll the sticky silicone roller over the LCD panel to remove any particles. 3. Remove the new glass panel from the service packaging. Note The new panels have a removable film protecting the glass on both sides. 4. Place the glass on a clean microfoam bag with the inside of the glass facing up the side with metal pins. Wearing gloves, carefully remove the...

Isopropyl Alcohol IPA

In the unfortunate event that gloves are not worn, and fingerprints and oil smudges are visible on the inside of the glass, cleaning should be done using a lint free cloth and IPA. Spray a small amount of IPA onto a CLEAN lint free cloth to avoid introducing any other contaminants. Gently wipe the area and allow the glass to dry. Note The silicone rollers are only effective in removing dust and other particles. If fingerprints or oil smudges are not removed prior to using the roller, the...

Replacing the Memory

Notch Memory

With the computer face down, orient the notch on the DIMM with the notch in the memory slot. In this case, the notch is on the left. 2. With your fingers, press the DIMM fully into the slot until you hear a click. Repeat for the other DIMM slot. 3. Fold the black tab over each DIMM. 4. Replace the memory access door. 5. Use a Phillips 2 screwdriver to tighten the captive screw on the memory access door. 6. Make sure the computer recognizes the new memory by opening System Profiler, clicking...

Replacing the Ambient Temperature Sensor Cable

Imac Temperature Sensor

Connect the cable to the sensor board on the speaker. 3. Connect the sensor cable and the fan cable to the logic board. 3. Connect the sensor cable and the fan cable to the logic board. 6. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.

Replacing the Inverter Cable

Lvds Cable

Remove the LCD panel from the ESD bag. 2. Connect the inverter cable to the inverter board on the rear of the display panel. 3. Connect the other end of the inverter cable to the power supply. 4. Lower the display panel into the computer. 5. Connect the display temp sensor cable to the left side of the logic board. 6. Connect the LVDS cable to the logic board. Replace the two T6 screws. 6. Connect the LVDS cable to the logic board. Replace the two T6 screws. 9. Clean and replace the glass...