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Old 04-15-2022, 12:11 PM   #2
grimacelord
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Join Date: Jan 2017
City & State: Atlanta, GA
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Default Re: Apple iPad Pro 3rd Generation 12.9" (A1876) No Power/Charge When Screen Is Connec

So it looks like Pins 29 and 27 are the I2C data lines for the display connector. I2C_TCON_SCL_1V8_CONN and I2C_TCON_SDA_1V8_CONN, respectively.

Pin 29 (I2C_TCON_SCL_1V8_CONN) connects to C4565 and R4561. The other side of R4561 (I2C5_SCL_1V8) connects to R0760 and BE47 pad underneath the SOC.

Pin 27 (I2C_TCON_SDA_1V8_CONN) connects to C4575 and R4571. The other side of R4571 connects to R0761 and BC47 pad underneath the SOC.

I have measured each resistor in both circuits and all of them are normal. There are no short to ground in either circuit. I am getting 1.8V on both circuits.

Am I looking at a SOC (CPU) problem here?
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