Troubleshooting Testing for Power/ - 6
Testing for Power
The iMac requires “trickle” voltage (+5 TRKL) in order to
power-on. If you are experiencing power problems in the iMac
unit, you will want to test for trickle power at various points in
the system to pinpoint the location of the problem and to deter-
mine whether or not the power supply is functioning normally. If
you have trickle power in the system, the odds are your power
supply is OK.
In general, you should test for power at the AC outlet first. Next,
it is best to start at the end (in this case, the logic board) and
trace power backwards through the system. In this way, you will
be able to immediately pinpoint which component is failing. Note:
It is highly unlikely that the power filter board will fail; there-
fore, you need not test for power at this component.
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