Apple IMAC User Manual - Page 89
At the Power Supply Board, General/ Testing for Power - 7
UPC - 067540444435
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Troubleshooting General/ Testing for Power - 7 At the Power Supply Board Note: The procedure below tests for +5 V on the original iMac power supply board, 661-2081. Refer to the procedure on the next page to test for +5 V on the Version 2 (661-2167) 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. You will need a volt meter to test for power on the power supply board. Refer to the picture below to locate the necessary test points on the power supply. 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. Testing for Power at the Power Supply Board