Troubleshooting Testing for Power/ - 11
At the Power Supply Board
First remove the top access cover and then remove the CRT EMI
shield to reach the power supply board.
±
Warning:
In this next procedure, the power supply will be
exposed and the unit plugged in. Use extreme caution and avoid
touching the exposed power supply to avoid any shock hazard when
working on an open unit.
Note
: You will need a volt meter to test for power on the power
supply board. Refer to the picture on the next page to locate the
necessary test point referenced in the following procedure.
Ground the black probe of a volt meter to the computer chassis.
Plug in the iMac, but leave it powered OFF. Then, being careful not
to short together any pins, touch the red probe on the volt meter to
pin 24 on the power supply board and test for +5V.
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