No display on my iMac 20" A1224
No display on my iMac and noting rear light
i have connected an external monitor and function;
i have see the diagnostic led:
led 1 is ever on;
led 2 is on when i press the power button;
led 3 blink one second and light on
led 4 is ever off.
I have disassamble the panel and i have test the supply of the panel, but the 5v
of the pin 28- gnd of the panel there isn't.
I suppose the graphics card hasn't problems, otherwise the external monitor will not work
You have the schematics of the logic board
mt mail is firstname.lastname@example.org
Is this a good question?