iMac 27" power stays on without the LCD assembly
Hello everyone,
Computer guy here and repaired all kinds of Apple iMacs... This iMac 27” puzzled me to no end.
I’ll do my best to explain…
- If I powered up the iMac it will shutdown within seconds (it will show the white screen and the Apple chime before shutdown).
- The iMac won’t come on again unless I unplugged the power cord for few seconds. Try again and the iMac will power up/shutdown within seconds. Yes. I have replaced the power cord.
- Here is the kicker… after I removed the LCD assembly along with the usual wires/cable/graphic ribbon etc; I can powered up the iMac, hear the Apple chime and it continues to run just fine for hours.
- As soon as I restored the LCD assembly, the iMac goes back to shutting down within seconds.
- Could that be the backlight invertor or the main power pack? I am guessing there isn’t enough power? The power pack gets weaker etc?
Looking forward to any suggestions you may have.
Thank you