Apple led cinema display 24inch User Manual
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© 2008-2010 Apple Inc. All rights reserved. Apple Technician Guide Take Apart LED Cinema Display (24-inch)
LED Cinema Display (24-inch) Take Apart — General Information 42 2010-11-25 General Information Opening the Unit • The LED Cinema Display (24-inch) has a glass panel that attaches to the front, which must be removed prior to replacing any module on the unit. • Imp ortant: 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. • F ollow 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 the LED Cinema Display (24-inch): • ESD-saf e workstation, including an ESD mat and wrist or heel strap • ESD bags (f or storing ESD-sensitive parts while removed from unit) • M agnetic Torx T10 screwdriver • B lack stick (nylon probe, Apple part #922-5065) or other non-conductive nylon or plastic flat-blade tool • A ccess card (Apple part #922-7172) • C lutch mechanism retrieval tool (Apple part #922-7849) • T hermal paste syringe (Apple part #922-9625) for camera • K apton tape • D igital volt meter (for troubleshooting) • S oft, 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 Required Special Tools for Glass Panel Special tools are required to remove, handle and clean glass panel. • 9 22-8252 – Suction cups, Pkg of 2 • 9 22-8253 – Gloves, lint-free, anti-static, Pkg of 2 • 9 22-8258 – ESD bags, 24”x20”, Pkg of 5. To prevent the buildup of static charges which may attract dust particles, store the LCD panel in an ESD bag when it is removed from the unit. • 9 22-8259 – Microfoam bag to store the glass panel, Pkg of 5 • 9 22-8261 – Sticky silicone roller (6-inch) to clean the glass panel • 9 22-8262 – Sticky sheet pads to clean the silicone roller • 9 22-8263 – Polishing cloths, anti-static, optical-grade micro-terry, Pkg of 5
LED Cinema Display (24-inch) Take Apart — General Information 43 2010-11-25 Cleaning Tools Starter Kit The following tools are offered in the cleaning starter kit (076-1277): • Suc tion cups, 1 pair • G loves, lint-free, anti-static, 2 pairs • S ticky silicone roller (6-inch) to clean the glass panel • S ticky sheets to clean the silicone roller, 2 pads • P olishing cloths, clean, anti-static, optical-grade micro-fiber “terry” style, 5 cloths • M icrofoam bag to store the glass panel, 5 bags • ESD bag f or LCD panel storage, 5 bags Cleaning & Handling the Glass Panel Follow cleaning procedures in this manual to ensure glass panel is free of dust and other particles before returning unit to customer. • T he glass panel is not tempered and will break into sharp pieces of mishandled. A scratched or broken glass panel is not covered under warranty. • R emoving glass panel requires special tools such as lint-free gloves, rubber suction cups, microfoam storage bags, and iKlear cleaning solution. • T o prevent contamination, wear lint-free gloves and handle glass only by edges. Do’s and Don’ts DO • Handle glass panel using lin t-free gloves. • U se only a sticky silicone roller to clean the inside surface of glass and LCD panel. • P lace glass panel into a clean protective microfoam bag when removed from unit. • S tore glass panel in a safe area where it will not be broken or damaged. • S tore LCD panel in an anti-static bag to prevent buildup of static charges which may attract dust particles to display’s surface. • S tore silicone roller and sticky paper within a temperature range of 39-104 F (5-40 C). • I f 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 • T ouch inside of glass with bare hands or dirty gloves. Fingerprints are difficult to remove. • P lace 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.
LED Cinema Display (24-inch) Take Apart — General Information 44 2010-11-25 How to Remove a Broken Glass Panel A shattered panel can be removed using safety glasses, packing tape, and leather gloves. 1. P ut on the safety glasses and leather gloves. 2. La y 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.
LED Cinema Display (24-inch) Take Apart — General Information 45 2010-11-25 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.
LED Cinema Display (24-inch) Take Apart — General Information 46 2010-11-25 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.
LED Cinema Display (24-inch) Take Apart — General Information 47 2010-11-25 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. S tand 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. W hen the repair is finished the cloth should be disposed of immediately. 12. U se 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.
LED Cinema Display (24-inch) Take Apart — General Information 48 2010-11-25 Safety Warning: HIGH VOLTAGE: The AC/DC power supply board and logic board remain powered up whenever the system is plugged in. Use extreme caution when troubleshooting system with glass panel and LCD panel removed. • D on’t work alone. In the event of electrical shock it is important to have another individual present who can provide assistance. • K eep one hand in your pocket when working on any unit 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. • D on’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 the power supply. The power supply contains a high voltage capacitor that may remain charged for several minutes even when unit is unplugged. Never touch leads on top side of power supply, especially near warning sign. 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 guide, you may notice small differences in appearance between the image pictured and the unit you are servicing. However, although appearance may differ, steps and sequence are the same unless noted.
LED Cinema Display (24-inch) Take Apart — Glass Panel 49 2010-11-25 First Steps • Unplug all cables and the power cord. • P ut on ESD strap. Caution: The glass panel is not tempered and will break into sharp pieces if mishandled. A scratched or broken glass panel is not covered by warranty. Important: This procedure requires special tools, which are offered individually or as part of a cleaning kit. See General Take Apart section for more information. Tools • ESD wrist strap • lin t-free gloves • suc tion cups • stick y silicone roller • stick y sheets to clean the silicone roller • micr ofoam bag to store glass panel Glass Panel
LED Cinema Display (24-inch) Take Apart — Glass Panel 50 2010-11-25 Removal Note: Glass panel is held in place by magnets. Note: There are guide pins on back of glass panel. Be careful not to bend or break guide pins during removal or installation. If any pins are missing, check for loose metal pieces inside unit and replace glass panel. Apple strongly recommends wearing clean, lint-free gloves whenever handling the glass panel, to reduce cleaning required on reassembly. 1 Lay display on its back and press clean suction cups in opposite corners on clean glass panel. 2 Lift panel straight up and off.