Hello. I have a strange problem with an iPhone XS motherboard which I recently began working on.
+
[video|3794]Hello. I have a strange problem with an iPhone XS motherboard which I recently began working on.
When the power supply is plugged into the motherboard, it immediately draws a ton of amps and gets EXTREMELY hot. I separated the motherboard, and narrowed it down to the U3300 chip. I put some rosin smoke on it, and noticed that there is only one pad of the chip which gets hot. I replaced the chip, and still, the short was there. The pad which gets hot is on the PP_BATT_VCC line, which tests fine with a multimeter. Does anyone know how to fix this issue? All the other capacitors look fine on the line. I have come across this same issue multiple times on some iPhone XR motherboards but I couldn’t figure out how to fix it. Thank you for your help
Update: I think the board is shorted to ground by the one pad that overheats but i’m not sure how to fix it.
Hello. I have a strange problem with an iPhone XS motherboard which I recently began working on.
When the power supply is plugged into the motherboard, it immediately draws a ton of amps and gets EXTREMELY hot. I separated the motherboard, and narrowed it down to the U3300 chip. I put some rosin smoke on it, and noticed that there is only one pad of the chip which gets hot. I replaced the chip, and still, the short was there. The pad which gets hot is on the PP_BATT_VCC line, which tests fine with a multimeter. Does anyone know how to fix this issue? All the other capacitors look fine on the line. I have come across this same issue multiple times on some iPhone XR motherboards but I couldn’t figure out how to fix it. Thank you for your help
+
+
Update: I think the board is shorted to ground by the one pad that overheats but i’m not sure how to fix it.
Hello. I have a strange problem with an iPhone XS motherboard which I recently began working on.
When the power supply is plugged into the motherboard, it immediately draws a ton of amps and gets EXTREMELY hot. I separated the motherboard, and narrowed it down to the U3300 chip. I put some rosin smoke on it, and noticed that there is only one pad of the chip which gets hot. I replaced the chip, and still, the short was there. The pad which gets hot is on the PP_BATT_VCC line, which tests fine with a multimeter. Does anyone know how to fix this issue? All the other capacitors look fine on the line. I have come across this same issue multiple times on some iPhone XR motherboards but I couldn’t figure out how to fix it. Thank you for your help