Home▸ Forums▸ iMac G5 Logic Board — #7▸ iMac G5 Logic Board — #7
Post #7 by mcdermd
Source ForumiMac G5 Logic Board — #7
CategoryHardware
Post DateTue, 24 Jul 2012 - 20:35
Original URLhttps://68kmla.org/bb/threads/imac-g5-logic-board.25902/
Post
That looks like an iMac G5 ALS (Ambient Light Sensor). ifixit.com has a guide.

I don't see any bad caps on the logic board. The power supplies in them go bad due to failed caps, though.

The big question is - does it go "bong" when you turn it on? Any lights? Fans?

Under the top fan by the optical drive is a button on the logic board. That will allow you to turn it on with the back off. Near there you will see four diagnostic LEDs :

• LED 1 indicates that trickle voltage from the power supply has been detected. This LED will be ON when the computer is turned off and your power supply is working correctly.• LED 2 indicates that the main logic board has detected proper power from the power supply when the computer is turned on. This LED will be ON when the computer is turned on and the power supply is working correctly.

• LED 3 indicates that the computer and the LCD display are communicating. This LED will be ON when the computer is turned on and video signal is being generated.

• LED 4 lights only if the computer detects an over-temperature condition. This LED will be OFF when the computer is turned on and running at the correct temperature.
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