Introduction
Remove your display panel to gain access to the hard drive, optical drive, and power supply.
Tools
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Disconnect the LCD temperature sensor by pulling the connector straight out of its socket on the logic board.
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Disconnect the display data cable connector from its socket on the logic board by pulling the attached plastic tab towards you and away from the iMac.
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Remove the eight 12 mm T8 Torx screws securing the display panel to the rear case.
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Lift the right side of the display panel a few inches up from the iMac.
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With the LCD lifted, disconnect the LCD cable by pulling down.
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Alternatively, the LCD power cable can be disconnected from the LCD, rather than the power supply.
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Conclusion
To reassemble your device, follow these instructions in reverse order.
The temp sensor on my EMC2134 is located underneath the LCD and the cable is not very long. I propped up the LCD to facilitate removal.
Pierre Scerri -
I got an error for the LCD thermal sensor(4sns/1/40000000: TLOP-130.000), and now the fan runs full tilt all the time! I guess I may have damaged the cable...
morgandan -
there are two connections together; picture does not make that clear or which one to remove.
jay -
You have to be extremely careful when pulling out the LCD Temp connection as it doesn't want to come easy. I almost pulled the entire connection off the logic board using too much force. I therefore, used a pair of hemostats to grab the male end (the very top of the connector) and used a small screwdriver to hold the base of the connection in-place (female end attached to the logic board) in order to pull the connector apart.
tpolak -
There apparently is a variant of the EMC2134, like Pierre Scerri said. It has its LCD temp sensor underneath the LCD; the thin wires are about 5 in / 13 cm long and taped to the back of the LCD, and only about 2 in free, so lift the LCD gently.
There is a connector on the place where the LCD temp connector is on the iFixit photo, but in this variant it is marked 'CPU FAN' and there is no reason to disconnect it.
The logic boards in my computer are black, not blue.
goosveen -