This guide will show you how to remove the CCFL tubes from the CCFL assembly.
一位我们社区很棒的成员写出了本指南。它不是由 iFixit 工作人员管理。
This guide will show you how to remove the CCFL tubes from the CCFL assembly.
Loosen the single Phillips screw in the center of the access door.
This screw is captive in the access door.
Remove the access door from your iMac.
The glass panel is fixed onto the front bezel with fourteen magnets around its perimeter.
Stick two suction cups to opposing corners of the glass panel.
To attach the suction cups we sell, first position the suction cup with the movable handle parallel to the face of the glass panel. While lightly holding the suction cup against the glass, raise the movable handle until it is parallel with the other handle.
If your suction cups refuse to stick, try cleaning both the glass panel and the suction cup with a mild solvent such as Windex.
Gently pull the glass panel straight up off the iMac.
The glass panel has several positioning pins around its perimeter. To avoid shearing these pins off the glass panel, be sure to only pull straight up during removal.
Be meticulous about cleaning the LCD and the inside face of the glass panel before reinstallation, as any fingerprints or dust trapped inside will be annoyingly visible when the display is on. Placing the glass flat, inside face down, on a fresh aluminum-foil surface is a good way to keep it clean.
Remove the following 12 screws securing the front bezel to the rear case:
Eight 13 mm T8 Torx.
Four 25 mm T8 Torx.
Place your hands at the top corners of the bezel (to the side) and lift the bezel 2-3cm from the body by working from the top. After this you can also disengage the bottom of the bezel (the memory modules will prevent the bottom of the bezel to detach first). When reassembling, start with the bottom of the bezel.
The top of the bezel hosts a microphone attached to the logic board. Gently lift the bezel to not damage the microphone wiring or connector by accidentally pulling the cable.
At this point, you can either detach the microphone cable and remove the bezel, or keep the microphone cable attached and rest the bezel on your work surface or the chassis of the Mac.
To fully detach the bezel: disconnect the microphone cable connector, removing tape as necessary.
To keep it attached, leave the microphone cable attached to the logic board, and place the bezel 'above' the chassis, with the microphone cable forming a hinge.
If you keep the microphone attached to the chassis, make sure you don't accidentally damage the microphone or logic board by bumping into the loose bezel.
When reassembling the bezel:
be sure to tuck the microphone cable and connector into the void next to the camera board.
Gently guide the microphone connector and cables through the ±1in long slot at the right of the iSight camera. Once the bezel is properly assembled, gently push the microphone connector and cable into the bezel through that slot.
Pull the LCD temperature sensor connector straight up out of its socket on the logic board.
If necessary, de-route the LCD temperature sensor cable from behind the logic board.
When you remove the LCD, check the routing of the LCD temperature display cable. On reinstalling the display, be sure this cable does not block one of the bottom screws for the front bezel.
Remove the two 5.3 mm T6 Torx screws securing the data display cable to the logic board.
Use the attached black tab to pull the data display cable connector away from the logic board.
Remove the eight 12 mm T8 Torx screws securing the display panel to the rear case.
Lift the display panel from its left edge and rotate it toward the right edge of the iMac.
With the display panel still lifted, disconnect the four inverter cables.
During reinstallation, place the four inverter cable connectors in voids between components attached to the rear panel so the display panel will sit flush.
During reassembly, the order of the inverter cables is interchangeable within each socket.
If you are replacing a hard drive and have an extra set of hands, it is possible to reach in and remove the drive without disconnecting anything but the LCD temp and display connector in the previous step with the LCD in its propped position.
The rest of this procedure should be done in the cleanest possible work environment to avoid dust getting BEHIND the LCD (I learned this the HARD way!)
Once the LCD panel is removed you need to peel back the black foil from the top edge of the LCD to reveal the clear plastic PCB protector.
Now gently peel the clear plastic PCB protector off the top edge. Make sure you don't damage the flex cables attached to the PBC you are exposing.
There are a total of 8 flex cables along the top edge
Use a sharpie or similar, mark the side brackets on either side of the LCD panel before removing screws as they are different
Use a T10 Torx driver to remove the 2 screws from each side bracket (total 4 screws)
Stand the LCD panel on its TOP edge and locate the lock tabs along the BOTTOM edge. There are 5 along the length of the bottom edge
Use a flat blade driver or metal spudger to Gently pop the bezel off the lock tabs.
Locate the lock tabs on either side of the LCD panel. There are 2 on each side
Use a flat blade driver or metal spudger to Gently pop the bezel off the side lock tabs.
Now gently separate the metal bezel from the main body of the LCD panel
Lay the LCD panel down on with viewing side UP and remove the metal bezel
Make sure you are careful when removing the bezel from the TOP edge as you will be exposing the 8 flex cables mentioned in step 1.
Note the 3 flex tabs on the left edge
Do not damage any of the tabs or flex cables as these are the Row and Column Drivers. Damage to these will will cause faults like vertical/horizontal lines or white screen etc.
WARNING - Once the bezel is removed the LCD is LOOSE in the black plastic frame - only held in by the small gasket underneath.
Using a plastic spudger or pry tool, work GENTLY around the edges of the LCD to loosen it from the gasket below - use GREAT CARE so you don't crack or chip the panel as it is only a couple mm thick
Once the LCD is loose you need to HOLD it in place in the black plastic frame and GENTLY flip the entire assembly so the LCD is flat on the work surface
Remove the tape securing the LVDS cable
Press IN the 2 silver spring loaded catches on either side to release the cable and gently extract it from the connector
Peel the back Black foil and clear plastic PCB protector to fully expose the PCB that runs across the top of the LCD assembly
Remove the 2ea Philips head screws from each end of the PCB
The PCB actually has a 3rd screw hole in the centre of the board. Perhaps my assembly is missing a screw
Gently flip the PCB over 180deg so it is off the aluminum back panel.
Be CAREFUL not to damage the 8 flex cables
The PCB may be attached to the aluminium by some adhesive near the LVDS connector. IF so use a plastic pry tool or spudger to GENTLY lift the PCB up
Now lift the the back panel off the LCD separating the LCD from the back light assembly
Disassembling the back-light assembly is a little fiddly as there are a number of parts that all want to come apart at the same time
Remove the 6 Philips screws from the rear of the back light assembly
Removing the white tape from the CCFL cable.
Un-clip the CCFL cable from the black plastic surround
There are 2 CCFL cables and the process is essentially the same for each
Separate the black plastic surround from the aluminum back plate to access the CCFL tube assemblies
Start by un-clipping the tabs along the top edge of the assembly. There are 4 tabs along the top
The top CCFL tube can be seen and CAREFULLY removed
The bottom of the black surround can now be un-clipped and the entire surround removed
There are 4 tabs along the bottom of the assembly
Once the black surround is off the rest pretty much comes apart with the bottom CCFL tube being able to be removed in a similar manner to the top
The centre of the back light assembly is made up of 4 main parts. A perspex sheet with white plastic coating, 2 opaque matt plastic sheets, and 1 Pearlescent matt plastic sheet
The plastic sheets are polarisers so need to be kept clean and free of dust and scratches
The CCLF tube assemblies are made up of a U shaped reflector with 2ea individual tubes inside. The entire assembly is 457mm long and 7.6mm wide. There are no part numbers on the assembly however there is a S on the end with the wires attached and an 18 on the other end.
The 2 CCFL tubes are held together with a figure 8 rubber band in the middle of the reflector so both tubes must come out at the same time.
The individual tubes are 448mm long (excluding the terminals - standard way to measure is end of glass to end of glass) and are 2.4mm diameter.
The CCFL are soldered to the wires so not a simple plug in replacement
The CCFL are EXTREMELY fragile so ensure you dont break them when installing them.
The CCFL reflectors are a tight fit over the sides of the perspex sheet and the other layers of plastic. Patience and a plastic spudger or pry tool should get you there
See the Removing CCFL from iMac 20in LCD CCFL assembly guide for details
Remove the white tape from either end of the rear of the CCFL assembly.
Carefully remove about 15-20mm of heat shrink from the CCFL cable to allow the end cap to be removed, making sure you DO NOT cut or nick the wire insulation.
The wires have a HIGH VOLTAGE applied during operation and the insulation may break down if damaged causing a short
While holding the assembly, slowly and gently pull the THICK wires up and out of the slots in the white rubber cap.
Pull the wires one at a time ensuring you don't flex the CCFL and break it.
This will reveal the pins and solder joints.
Gently push the THIN wires through the rubber end cap to create a bit of a loop on the rear of the assembly.
Using a plastic pry tool you can pop the rubber end cap out and then lift the thin wires out of the groove in the rear of the CCFL assembly
Note the thin wires are held in the groove by a small amount of adhesive.
Run the pry tool the length of the assembly and free the wires all the way to the other end cap
gently pop the rubber end cap out of the assembly
Gently pull the rubber end cap off the CCFL to expose the pins and solder joints
The CCFL are FRAGILE and will easily break
Now its a simple task of un-soldering each wire and soldering in the new CCFL
There is a little figure 8 rubber band tying the 2 CCFL together at their centre.
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