Re: Apple iMac A1419 27" Retina 5K MID 2015

LED 1
Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED will turn
on when you connect the iMac to a working AC power source. The LED will remain on as long as the computer is on or
asleep.
When the computer has been shut down correctly, LED 1 behavior may differ:
If a startup event is scheduled in System Preferences/Energy Saver, then LED 1 will stay on after a correct
shutdown.
If no startup event is scheduled in System Preferences/Energy...

Re: New Members - please post your introductions here

Hi Everyone

Been in the electronics industry for about 40 years so seen a lot of changes. Now fix Apple Mac Computers which I have been doing since the Macintosh Lisa.

It is getting more difficult to obtain parts now and circuit diagrams but the board swapping and minor component replacement is still keeping me busy and sourcing parts to sell.

With this excellent forum I hope to find new sources of parts and circuit diagrams and learn more electronic tips

Andy