#1 Macbook Air 13 Retina ( main 820-01521-A) stuck at 5v when connect J6700 flat
przez robgerr • 1 września 2022, 11:17
Hi this macbook does not turn on completely, if I connect the usb tester I get a voltage of 5V on both usb ports. I disassemble everything and take out the motherboard and test it in the workbench. I connect the power supply, I get the first second 5v and then switch to 19V with absorption of 0.40A. The mainboard appears to be on and the CPU warms up slightly. There is no trace of oxidation. I connect all the flats, same defect, it remains at 5V. The problem occurs when I connect the flat of the trackpad and keyboard, (position J6700). I have tried to isolate both the trackpad and the keyboard, then they simply connect the flat cable but the problem persists. The flat does not seem broken but I would like to understand if it is he who causes this anomaly or is there something else.
Thank you
Thank you