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Hi PCTRONICS,
I have the exact same issue.
We have to consider that que power supply "talks" to the mackbook:
It first send +5V to the macbook, and if this one is OK, it send then the +20V.
It's not that easy as before......
If you have any solution , please share
There's a special comms circuit. I am not sure of the needed mods for connecting to a lab bench power supply. It's not as simple as giving 5v, then 20v.
There's a handshake of some kind to ensure that the charger CAN provide 20v safely, and i'm unsure of this.