Hello,
I have a A2338 MacBook Pro here that came to me because the battery wasn't being detected. The owner tried to replace the battery themselves thinking that the battery was the problem but the behavior continues even with their new aftermarket battery. They also accidentally ripped off the black plastic clasp to the battery flex cable connector @ J5151, but I pulled that off of a donor board and replaced that for them already. I did quickly check to see if that was simply the problem, but it's not.
First thing I checked was I2C_SMC_PWR_3V3_SCL and I2C_SMC_PWR_3V3_SCA in diode mode with no power or battery connected. I found that I2C_SMC_PWR_3V3_SCA is showing a short on that line reading at 0.015V. I2C_SMC_PWR_3V3_SCL reads 0.624V in diode mode. I then checked the schematic and tried removing any of the components on that line that are attached to ground to try and find which component is shorted. I removed U5150, CD201, and UD201, but the short remains. So then I checked to see if there is also a short present on PP3V3_AON and PP3V3_S2, but there is not.
I'm still learning this type of repairs, but from my limited knowledge and looking at the schematic, I am failing to see what other components could be responsible for bringing the I2C_SMC_PWR_3V3_SCA line short to ground.
I am really not sure what I need to check next, so I was hoping someone could help me out here. Thank you.
I have a A2338 MacBook Pro here that came to me because the battery wasn't being detected. The owner tried to replace the battery themselves thinking that the battery was the problem but the behavior continues even with their new aftermarket battery. They also accidentally ripped off the black plastic clasp to the battery flex cable connector @ J5151, but I pulled that off of a donor board and replaced that for them already. I did quickly check to see if that was simply the problem, but it's not.
First thing I checked was I2C_SMC_PWR_3V3_SCL and I2C_SMC_PWR_3V3_SCA in diode mode with no power or battery connected. I found that I2C_SMC_PWR_3V3_SCA is showing a short on that line reading at 0.015V. I2C_SMC_PWR_3V3_SCL reads 0.624V in diode mode. I then checked the schematic and tried removing any of the components on that line that are attached to ground to try and find which component is shorted. I removed U5150, CD201, and UD201, but the short remains. So then I checked to see if there is also a short present on PP3V3_AON and PP3V3_S2, but there is not.
I'm still learning this type of repairs, but from my limited knowledge and looking at the schematic, I am failing to see what other components could be responsible for bringing the I2C_SMC_PWR_3V3_SCA line short to ground.
I am really not sure what I need to check next, so I was hoping someone could help me out here. Thank you.
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