Re: Macbook 820-3115 missing 3V42_G3H
That is expected and a good sign. U6990 and linked local parts create this 3v42 rail. This rail is required to turn on the magsafe LED (green / orange). The color of the led is over a single wire communication protocol.
U7491 is another component that is powered off the 3v42 rail.
Remove all power -> meter in lowest resistance scale -> what is the resistance to ground of PPBUS_G3H ?
Greenlight is on with 3,4V on Pin 2 of L6995
without U7491 even attached.
Remove all power -> meter in lowest resistance scale -> what is the resistance to ground of PPBUS_G3H ?
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