No backlight, but powers on and the image is there.
I’ve got an iMac from a customer that was having issues a couple of months ago and I replaced the inverter board, which seemed to fix the issue.
The machine has since come back, and replacing the inverter board again hasn’t solved the issue.
Now, when the computer powers up, I get a brief flash of backlight, then off completely. I’m not 100% sure the inverted board is good. I was hoping somebody had a way to isolate if the issue is the inverter or the LCD itself.
Can I probe the inverter? I’m just not sure which points or what voltages I’m looking for.