Hi all,
I'm repairing a water damage 820-00840 here. Visible liquid damage is around u3900, u8400 and u7650. Has been cleaned.
So situation is as follow:
-PPDCIN_G3H = 5.2v
-PP3V3_G3H = 3.4v
Started by replacing both CD3215 (might not have been needed after all):
- PP20V_USBC_XA_VBUS = 3.4v
- PP3V3_UPC_XA_LDO = 3.3v
- PP1V8_UPC_XA_LDOA = 1.8v
- PP1V8_UPC_XA_LDOD = 1.8v
- PP1V1_UPC_XA_LDO_BMC = 1.1v
Same with XB.
Also I see activity on UPC_XA_UART_RX, UPC_XA_UART_TX and TBT_X_SPI_MISO.
This indicates that the CD3215s are ok to me.
I had a short on PP3V3_G3H and u1900 (SLG3AP3444) got hot.
Replaced u1900 from a donor board but SYSCLK_CLK12M_SMC is still missing.
I think the schematics say that SMC_CLK12M_EN should be high to enable the clock for the SMC.
The SMC is needed to communicate with i2c to the CD3215s right?
SMC_CLK12M_EN is low and is generated from the SMC.
So SMC u5000:
- PP3V3_S5_SMC = 3.4v
- BUF_SMC_RESET_L = 3.4v
- SMC_BC_ACOK = 3.4v
- SMC_CBC_ON (not sure if needed I don't have a working board) = 0v
So questions are:
SMC clock needs to work to communicate with the charger to get 20v right?
Do you guys have any idea if the SMC is at fault here or do I need to measure more?
It could be that the old hot u1900 had blown the SMC SMC_CLK12M_EN pin.
Thanks in advance
I'm repairing a water damage 820-00840 here. Visible liquid damage is around u3900, u8400 and u7650. Has been cleaned.
So situation is as follow:
-PPDCIN_G3H = 5.2v
-PP3V3_G3H = 3.4v
Started by replacing both CD3215 (might not have been needed after all):
- PP20V_USBC_XA_VBUS = 3.4v
- PP3V3_UPC_XA_LDO = 3.3v
- PP1V8_UPC_XA_LDOA = 1.8v
- PP1V8_UPC_XA_LDOD = 1.8v
- PP1V1_UPC_XA_LDO_BMC = 1.1v
Same with XB.
Also I see activity on UPC_XA_UART_RX, UPC_XA_UART_TX and TBT_X_SPI_MISO.
This indicates that the CD3215s are ok to me.
I had a short on PP3V3_G3H and u1900 (SLG3AP3444) got hot.
Replaced u1900 from a donor board but SYSCLK_CLK12M_SMC is still missing.
I think the schematics say that SMC_CLK12M_EN should be high to enable the clock for the SMC.
The SMC is needed to communicate with i2c to the CD3215s right?
SMC_CLK12M_EN is low and is generated from the SMC.
So SMC u5000:
- PP3V3_S5_SMC = 3.4v
- BUF_SMC_RESET_L = 3.4v
- SMC_BC_ACOK = 3.4v
- SMC_CBC_ON (not sure if needed I don't have a working board) = 0v
So questions are:
SMC clock needs to work to communicate with the charger to get 20v right?
Do you guys have any idea if the SMC is at fault here or do I need to measure more?
It could be that the old hot u1900 had blown the SMC SMC_CLK12M_EN pin.
Thanks in advance