iMac (27-inch, Mid 2010) — General Troubleshooting 26
2010-09-09
TS2P Excessive upper internal
enclosure temperature, or
Skin temp sensor damaged/
disconnected from top of logic
board.
Verify that the skin temp sensor cable
is securely connected to the top of the
logic board and sensor is attached to
rear housing (near the camera). Replace
the sensor cable if damaged.
TC0H Excessive processor heatsink
temperature, or CPU temp
sensor damaged/disconnected
from back side of logic board
(this sensor is part of logic
board)
Check CPU sensor cable connection to
logic board. It requires removal of the
logic board.
If the sensor is
disconnected, the
CPU fan will run at full
speed.
TG0D Excessive graphics processor
die temperature (this sensor
is part of graphics processor
chip)
Test with known-good video card
TG0H Excessive graphics processor
heatsink temperature, or
GPU temp sensor damaged/
disconnected from back side of
logic board (this sensor is part
of video card assembly)
Check GPU sensor cable connection to
logic board. It requires removal of the
logic board.
If sensor is
disconnected the CPU
fan will run at full
speed.
Tp1P, Tp2H,
Tp3H
Excessive power supply
temperature (these sensors
are part of the power supply
board)
Test with known-good power cable
harness , or known-good power supply
board.
ODD fan Optical fan/blower located
next to right speaker
Verify that the ODD blower/fan cable is
securely connected to the right side of
the logic board and that there are no
obstructions that would prevent the
blower/fan from rotating. Replace fan if
the error continues.
Normal fan operation,
except the ODD blower
HDD fan Hard drive fan/blower, located
below logic board, near hard
drive
Verify that the HDD blower/fan cable
is securely connected to the top of
the logic board and that there are no
obstructions that would prevent the
blower/fan from rotating. Replace fan if
the error continues.
Normal fan operation,
except the HDD blower
CPU fan CPU fan/blower, located next
to left speaker (logic board has
to be removed to replace CPU
blower)
Verify that the CPU blower/fan cable is
securely connected to the left side of
the logic board and that there are no
obstructions that would prevent the
blower/fan from rotating. Replace fan if
the error continues.
Normal fan operation,
except the CPU blower