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Swapped the CD3215 that was fluctuating at LDO and same thing. However, following a boot up sequence at the same location where I swapped the CD3215, I measured the PPDCIN_G3H and it's showing 3.92v instead of 5v like the rest. Can the issue be the Q3100 instead of the CD3215?

No go with the DFU after fixing the button. Going through some threads I saw one regarding the CD3215C and the 1V1_LDO. Three of the CD3215C have a fixed 1.15v and the forth fluctuates from 0-1v. Diode mode shows the 3 that are static at 3v to 2v, the one that fluctuates is at 1V drops...

Thank you for the link. Do the readings look good to you?

I have been testing the board alone and only one side usb-c terminal connected. The only voltages I get are on L7660 3.3v and fluctuating voltage on L7030 from 1.v to 4.1v. I have tested the coils in diode mode and this is what I get: .351v (L9080), others: .514v, .496v, .897v, 0.137v (L8102)...

Hello, Thank you for your response. I will refrain from mixing boards. I did check for knocked off components, damaged connectors and broken traces, and saw none. I did check 3v3_G3H_RTC and get a steady 12v. I checked the coils at U7800 and L7819 - L7821 no voltage. L7806 -809, L7813 -...

Hello, just an update. My helper replaced a logic board for a 1990 today and the mac wouldn't turn on. On both the 89 and 90 he switched the power button and afterwards they were both hard to press. I will look into that tomorrow. However, the 90, I was able to unplug the power button and open...

Hello, I am new here, and want to thank all of you who help us newbies. With that being said, I have a 1989 a customer brought in for repair to his keyboard. Where the connector connects to the board from the keyboard there was corrosion from water damage. Instead of replacing the keyboard, I...