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Macbook A1466 820-3437 3v42 Short

Instafixx

Instafixx

Active member
Device came in as not charging.
PP3V42 was shorted. PPBUS was 0V with no Shorts.
Injected Voltage and SMC was heating up. Replace the SMC.
Now i get 8.2V at PPBUS and i get 3.4V at 3V42 but still no Mgsafe light and not turning on.

PM_SLP_S4_L and ALLSYSPWRGD are missing.
 
Last edited:
2informaticos

2informaticos

Administrator
Staff member
Incorrect PPBUS_G3H voltage; probably no communication between SMC and U7100.

Check SMC's basic voltages and signals; already mentioned various times on the forum.
 
Instafixx

Instafixx

Active member
SMC_RESET_L 3.4V
WIFI_EVENT_L 0V
SMC_WAKE_L 3V
SMC_EXTAL 1V
SMC_XTAL 1.2V
PP1V2_S5_SMC_VDDC 1.2V
SMC_TCK IS 3.4V
SMC_TMS 3.4V
SMC_TDO 3.4V
SMC_TDI 3.4V
PP3V3_S5_AVREF_SMC 3.3V
 
Instafixx

Instafixx

Active member
Battery Bus (Diode to Ground)

Pins 1-3 OL
Pins 4/5 .500
Pin 6 2.7

U7100 Basic Voltages

CHGR_VFRQ 3.3V
CHGR_SGATE 15.6V
CHGR_AGATE 6.7V
CHGR_DCIN 16V
CHGR_ACIN 4.3V
CHGR_AMON 0.2V
PP3V42_G3H 3.4V
CHGR_RST_L 3.3V
SMC_BC_ACOK 3.4V
CHGR_BMON 0V
CHGR_CSO_N 8.1V
PP5V1_CHGR_VDD 5V
PP5V1_CHGR_VDDP 5V
CHGR_CSI_N 15.8V
 
2informaticos

2informaticos

Administrator
Staff member
When I say battery bus, I mean SCL/SDA lines; many-many times asking about such readings.
For U7100 is more easy to write pins number, instead of signal names.

Try another ISL6259 chip.
If still the same replace SMC.
 
2informaticos

2informaticos

Administrator
Staff member
Why do you thing missing?
Do you know what these signals represent?

What is actual PPBUS_G3H voltage, w/ and w/o battery connected?
 
2informaticos

2informaticos

Administrator
Staff member
U7100 requires a good communication with SMC, to control PPBUS_G3H properly.
If both SMC and U7100 have correct reset signal and good continuity on SCL/SDA lines, the voltage should go 12.5V aprox.
 
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