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A1990 MBP 15" 2018 No Power
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Re: A1990 MBP 15" 2018 No Power
Originally posted by mon2 View Postsigpic
MEOWING IN THE IMPOSSIBLE UNIVERSE!
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Re: A1990 MBP 15" 2018 No Power
See attached.
Your logic board has a CD3215 @ U3200 that is mated with a local SPI flash rom to boot the configuration for the power delivery interface.
Respectively, the ROM must be functional; with the correct data and then the power delivery feature will operate as required.
Check to see if there are voltages present to power the SPI ROM used to configure the CD3215 @ U3200. Check pin # 8 of U2890.
Do you see a clock pulse train on pin # 6 of U2890. Maybe you can check with a scope ? Otherwise, check the voltage with a meter.
Then check MISO (master in; slave out) & MOSI (master out; slave in) pins for voltages / scope activity.
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