Apple imac 21 5 inch late 2009 User Manual
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© 2010 Apple Inc. All rights reserved. Apple Technician Guide Take Apart iMac (21.5-inch, Late 2009)
iMac (21.5-inch, Late 2009) Take Apart — General Information 102 2010-11-18 General Information Opening the Unit • The iMac (21.5-inch, Late 2009) has a glass panel that attaches to the front, which must be removed prior to replacing any module on the unit. • Important: The glass panel should only be removed by Apple-authorized technicians. Follow all cleaning and handling instructions to prevent damaging glass panel or LCD panel. • Follow ESD precautions when glass panel is removed. For more information about ESD, refer to: kBase #HT3451: Electrostatic Discharge Precautions and Myths AppleCare Service Training: ESD Precautions Required Tools The following tools are required to service an iMac (21.5-inch, Late 2009): • ESD-safe workstation, including an ESD mat and wrist or heel strap • ESD bags (for storing ESD-sensitive parts while removed from unit) • Magnetized Torx T10 screwdriver • Magnetized Torx T8 screwdriver • Magnetized Torx T6 screwdriver • Phillips #2 screwdriver • Black stick (nylon probe, Apple part #922-5065) or other non-conductive nylon or plastic flat-blade tool • Kapton tape • Thermal paste syringe (Apple part #922-9625) for camera • Magnifying glass, for reading serial number etched on bottom of stand • Digital volt meter (for troubleshooting) • Soft, clean towel or cloth (to protect display and removed parts from scratches) For more information about tools, refer to: kBase #HT3452: Hand Tools for Desktop and Portable Repairs In addition, the following software programs are required for troubleshooting: • Apple Service Diagnostic (ASD), version 3S133 or later • Apple Hardware Test (AHT ), version 3A176 or later • Bluetooth Service Diagnostic (BSD)
iMac (21.5-inch, Late 2009) Take Apart — General Information 103 2010-11-18 Required Special Tools for Glass Panel Special tools are required to remove, handle and clean glass panel. • 922-8252 – Suction cups, Pkg of 2 • 922-8253 – Gloves, lint-free, anti-static, Pkg of 2 • 922-8258 – ESD bags, 24”x20”, Pkg of 5. To prevent buildup of static charges which may attract dust particles, store LCD panel in an ESD bag when it is removed from unit. • 922-8259 – Microfoam bag to store glass panel, Pkg of 5 • 922-8261 – Sticky silicone roller (6-inch) to clean glass panel • 922-8262 – Sticky sheet pads to clean silicone roller • 922-8263 – Polishing cloths, anti-static, optical-grade micro-terry, Pkg of 5 • iKlear Apple Polish or Brillianize anti-static spray cleaning solution. If you are unable to source iKlear or Brillianize, IPA (isopropyl alcohol) can be used to clean glass. Cleaning Tools Starter Kit The following tools are offered in the cleaning starter kit (076-1277): • Suction cups, 1 pair • Gloves, lint-free, anti-static, 2 pairs • Sticky silicone roller (6-inch) to clean glass panel • Sticky sheets to clean the silicone roller, 2 pads • Polishing cloths, clean, anti-static, optical-grade micro-fiber “terry” style, 5 cloths • Microfoam bag to store glass panel, 5 bags • ESD bag for LCD panel storage, 5 bags
iMac (21.5-inch, Late 2009) Take Apart — General Information 104 2010-11-18 Cleaning & Handling the Glass Panel Follow cleaning procedures in this manual to ensure glass panel is free of dust and other particles before returning the computer to customer. • The glass panel is not tempered and will break into sharp pieces of mishandled. A scratched or broken glass panel is not covered under warranty. • Removing glass panel requires special tools such as lint-free gloves, rubber suction cups, and microfoam storage bags. • To prevent contamination, wear lint-free gloves and handle glass only by edges. Do’s and Don’ts DO • Handle glass panel using lint-free gloves. • Use only a sticky silicone roller to clean the inside surface of glass and LCD panel. • Use iKlear ONLY on the outside surface of glass panel. • Place glass panel into a clean protective microfoam bag when removed from unit. • Store glass panel in a safe area where it will not be broken or damaged. • Store LCD panel in an anti-static bag to prevent buildup of static charges which may attract dust particles to display’s surface. • Store silicone roller and sticky paper within a temperature range of 39-104 F (5-40 C). • If silicone roller is no longer tacky, wash it in warm soapy water or wipe with isopropyl alcohol. If tackiness does not return, replace silicone roller. DON’T • Touch inside of glass with bare hands or dirty gloves. Fingerprints are difficult to remove. • Place glass panel onto a work surface where it may collect dust and other contaminants unless it has first been placed into a protective microfoam bag. 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 unit to prevent irreparable damage to the front surface of the LCD. If the front surface of the LCD is scratched by broken glass, the LCD may need to be replaced.
iMac (21.5-inch, Late 2009) Take Apart — General Information 105 2010-11-18 How to Remove a Broken Glass Panel A shattered panel can be removed using safety glasses, packing tape, and leather gloves. 1. Put on the safety glasses and leather gloves. 2. Lay the computer on a smooth, clean work surface. 3. Peel protective covering off the front of the glass. Remove and discard any large pieces of broken glass.
iMac (21.5-inch, Late 2009) Take Apart — General Information 106 2010-11-18 4. Apply a strip of packing tape horizontally across the top and bottom of the glass panel. Next, apply the tape diagonally, across the broken glass panel, forming an “X.” 5. Continue applying tape horizontally, thoroughly covering the broken glass. Most of the glass will still be attached to the steel ring that runs around the perimeter of the glass panel.
iMac (21.5-inch, Late 2009) Take Apart — General Information 107 2010-11-18 6. Use a black stick to pry the glass panel off the magnets on the rear housing. 7. Lift the entire glass panel off the rear housing.
iMac (21.5-inch, Late 2009) Take Apart — General Information 108 2010-11-18 8. Place the broken glass inside a large box, label the box, and dispose of it properly. 9. Using a whisk broom, clean the work surface of tiny glass particles. 10. Stand the iMac up and use a lint free cloth to carefully brush any of the particles off the iMac onto the table. Clean the work surface again. 11. When the repair is finished the cloth should be disposed of immediately. 12. Use a broom and dustpan to sweep up as much of the broken glass as possible. Glass fragments may have traveled several feet from the location of the glass panel, so be sure to thoroughly clean the entire area. Use a vacuum to remove the smaller fragments not picked up by the broom. Note: A broken glass panel may leave one or more scratches on the LCD display depending on the severity of the glass breakage. As long as the LCD itself has not been fractured the LCD does not require replacement, but be sure to let the customer know that the scratches are there and were caused by the broken glass panel.
iMac (21.5-inch, Late 2009) Take Apart — General Information 109 2010-11-18 Safety Warning: HIGH VOLTAGE: The AC/DC power supply PCB remains powered up whenever system is plugged in, whether or not system has been turned on. Use extreme caution when troubleshooting system with glass panel removed. • Don’t work alone. In the event of 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 provide a path to ground in the event that you accidentally make contact with line voltage. • Don’t wear jewelry, watches, necklaces, or other metallic articles that could present a risk if they accidentally make contact with power supply circuitry. Use extreme caution when working around power supply. The power supply contains a high voltage capacitor that may remain charged for several minutes even when computer is unplugged. Never touch leads on top side of power supply, especially capacitor leads located near warning sign. Important: If computer is shut down by removing power cord, allow power supply a good 2-3 minutes to discharge capacitors before handling it. However, if you select “Shut Down” via the Apple menu, the computer will discharge power supply capacitor almost immediately.
iMac (21.5-inch, Late 2009) Take Apart — General Information 110 2010-11-18 Logic Board Handling IMPORTANT: Always use two hands to support logic board and heatsink. Handling board incorrectly could flex board and damage chips and circuitry. Never handle board by heatsink. Reassembly Steps When no replacement steps are listed, replace parts in exact reverse order of Removal procedure. Note About Images in This Guide Because a pre-production model was used for most images in this manual, you may notice small differences in appearance between the image pictured and the computer you are servicing. However, although appearance may differ, steps and sequence are the same unless noted. Screw Sizes All screw sizes shown are approximate and represent the total length of the screw.