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MacBook Air A2337 (820-02016) — liquid damage, charger stuck in hiccup, no PP3V8_AON

G

Giuliongo

New member
Hi, I took this measurements:

Working board :
CHGR_RST_IN : 0V
I2C_SMC_PWR_1V8_SCL : 1.78V
I2C_SMC_PWR_1V8_SDA : 1.78V
CHGR_COMP : 1.56V
CHGR_AUX_DET : 3.42V
PPVBAT_AON_CHGR_REG : 11.97V
CHGR_CSI_FILT_P : 20V
CHGR_CSI_FILT_N : 19.99V
PPDCIN_AON_CHGR_R : 20V
CHGR_GATE_Q1 : 12.80V
CHGR_GATE_Q2 : 2.32V
CHGR_GATE_Q3 : 2.27V
CHGR_GATE_Q4 : 5.50V
CHGR_PHASE1 : 3.90V
CHGR_PHASE2 : 3.90V
CHGR_BGATE : 3.77V
CHGR_VBAT : 11.96V
CHGR_INT_1V8_L : 1.793V
CHGR_EN_MVR : 5.04V
CHGR_AUX_OK : 1.40V
CHGR_AMON : 0V
CHGR_BMON : 0V

Dead board :
CHGR_RST_IN : 0V
I2C_SMC_PWR_1V8_SCL : 0V
I2C_SMC_PWR_1V8_SDA : 0V
CHGR_COMP : 0V
CHGR_AUX_DET : 1.10V
PPVBAT_AON_CHGR_REG : 2.69V
CHGR_CSI_FILT_P : 5.14V
CHGR_CSI_FILT_N : 5.10V
PPDCIN_AON_CHGR_R : 5.14V
CHGR_GATE_Q1 : 0V
CHGR_GATE_Q2 : 0V
CHGR_GATE_Q3 : 0V
CHGR_GATE_Q4 : 2.87V
CHGR_PHASE1 : 3.10V
CHGR_PHASE2 : 3.17V
CHGR_BGATE : 0V
CHGR_VBAT : 2.70V
CHGR_INT_1V8_L : 0V
CHGR_EN_MVR : 0V
CHGR_AUX_OK : 0V
CHGR_AMON : 0V
CHGR_BMON : 0.45V

I also changed Q5820 and Q5840 which raised the diode value of PP3V8_AON_VDDMAIN from 0.14 to 0.30 which is a normal value.

I tried to inject 12V on PPVBAT AON and I read on VDDA and VDDP 5.04V, it seems that the U5200 is working but there is a power issue.
 
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