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820-00840 A1708 Trackpad and Keyborad Not Working

H

haimac

New member
I have this macbook that I am working on. The most suspicious thing that I found is voltage drop when trackpad is not connected vs when it's connected.

Voltage when disconnected:
TPAD_SPI_CS_L 3.3V
TPAD_SPI_INT_L 3.3V
TPAD_SPI_CS_CONN_L 3.3V
TPAD_SPI_IF_EN 3.3V

But when I tried to connect with trackpad it become:
TPAD_SPI_CS_L 3.05V
TPAD_SPI_INT_L ~1.9V
TPAD_SPI_CS_CONN_L 3.05V
TPAD_SPI_IF_EN ~1.9V


I have another good working board. The voltage on those should be the same with trackpad connected or not. What should I start to check about this problem?
 
H

haimac

New member
Yes, already tested with known working board, and also check this logic board with known good topcase/trackpad. It come down that the problem is within this logic board
 
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