Corrosion at PP3V42_G3H and SMC reset area.With 6mA power draw: D7012 bad/corrosion on D7012.With 6mA power draw: SMC bad/corrosion under SMC.Bad R7010 or R7011 (DC in board cannot recognize Board and DC-IN Voltage is 0V).SMC_RESET_L low due to corrosion at the JTAG connector (see JTAG)Įxample: (three A1466 machines with the same problem, 1)820-00165, SMC_RESET_L=0.5V 2)820-3209, SMC_RESET_L=1.27V 3)820-00165, SMC_RESET_L not checked).SMC_RESET_L low due to bad SMC or corrosion under the SMC.SMC_RESET_L low due to corroded R5100 pullup resistor (PPBUS_G3H was 8.17V).SMC_RESET_L low due to corroded R5115 pullup resistor, bad U5110, or bad U5000 Example:.DC in board has corroded traces around TC7SZ08AFEAPE or MAX9940 for onewire circuit(check onewire circuit diagram on older boards like 820-2530 - this is present on the DC in board now of the *A1466/A1465/A1369/A1370 Macbook Air).DC in cable(821-1722) corroded, and connector traces for SYS_ONEWIRE, SMC_BC_ACOK, and PP.PP3V42_G3H missing due to short to ground, bad D7012, bad U7090, R7080 corroding away, bad or corroded capacitors in SMC areaĮxample of corroded capacitors: (draws 66mA, 2Ohm short to ground on PP3V42_G3H).
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