Wonderful guide! First time I opened a imac.
I need to replace the LCD cable connector on the motherboard. It is broken and it caused a short circuit on the motherboard. On the motherboard, underneath the grafic card, I've found a fried SMD inductance (L9000 on the motherboard) in the powerline of the grafic card. I restored the powerline with some solder leaving the inductance out. Should be no problem.
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