A1466 2015-2017 13” MacBook Air

{|class="wikitable" ! style="text-align:left;"| Problem ! Solution
 * No green/orange light on charger
 * PP3V42_G3H missing due to short to ground, bad D7012, bad U7090, R7080 corroding away.
 * DC in cable(821-1722) corroded, and connector traces for SYS_ONEWIRE, SMC_BC_ACOK, and PP
 * 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)
 * SMC_RESET_L low due to corroded R5115 pullup resistor, bad U5110, or bad U5000
 * SMC_RESET_L low due to bad SMC
 * Bad R7010 or R7011 (DC in board cannot recognize Board and DC-IN Voltage is 0V)
 * SMC_RESET_L low due to bad SMC
 * Bad R7010 or R7011 (DC in board cannot recognize Board and DC-IN Voltage is 0V)

REMEMBER: SMC is not on if PPBUS_G3H is 8.15v instead of 8.55v(SMC needs to communicate with U7100 to tell it over SMBUS line to raise PPBUS_G3H from 8.15v to 8.55v).
 * No power, PM_SLP_S4_L is missing, 23-24 mA draw
 * U1950 is corroded and you can't see it.
 * Corrosion on probe points for SPI ROM U6100 area
 * Bad clock chip U1900
 * Corrosion on RTC pullup resistors R1300 to R1303 (or C1300/C1303 shorted to ground)
 * If you remove R8111 and PM_SLP_S4_L comes back, it's most likely dead CPU, check for corrosion around RAM area and if none then most likely dead CPU.
 * No power, 0 mA draw or 250 mA draw, PPBUS_G3H missing
 * Short to ground on PPBUS_G3H. Blown fuse F7140 for PPBUS_G3H(taking 0 mA), or good fuse(250 mA draw), bad tantalum capacitor on PPBUS_G3H.
 * No backlight
 * 0v - bad backlight fuse, short to ground inside connector/inside screen
 * 8v - feedback trace to LP8550 burned out, or BKL_EN missing.
 * 19-20v - BKL_PWM low, or SMC_LID low due to bad DC in board. SMC_LID also comes from the trackpad, so a bad trackpad can cause this.
 * 39-50v - screen backlight cable disconnected inside screen after DIY repair, bad connector, bad screen
 * No power, PPBUS_G3H 4v instead of 8.55v
 * Bad U7100, blown R7021/R7022
 * Any board level issue at all.
 * Look at J6100, and feel guilt free in killing it.
 * Keyboard and trackpad not working
 * Bad trackpad cable or bad trackpad.
 * SMC_RESET_L low, but board works outside of case
 * Bad trackpad. Trackpad controls SMC_LID, and SMC_RESET_L - so trackpad can mess with backlight.
 * Battery not recognized with X
 * Firstly, try a known good battery before assuming it is the board!
 * Look at J6100, and feel guilt free in killing it.
 * Keyboard and trackpad not working
 * Bad trackpad cable or bad trackpad.
 * SMC_RESET_L low, but board works outside of case
 * Bad trackpad. Trackpad controls SMC_LID, and SMC_RESET_L - so trackpad can mess with backlight.
 * Battery not recognized with X
 * Firstly, try a known good battery before assuming it is the board!
 * Battery not recognized with X
 * Firstly, try a known good battery before assuming it is the board!
 * Firstly, try a known good battery before assuming it is the board!

If PPBUS_G3H is 8.15v, SMC is not communicating properly with anything because its data line is blown. Check pullups on data line, see what may be pulling it down, most likely bad SMC. U5000


 * Running slow on low battery, high kernel_task usage in activity monitor
 * Bad connection of R5450 (possible corrosion). Reflow or change R5450.
 * Quarter Fan Spin (All Voltages are Pulsing)
 * Check for corrosion or broken traces around U7100.
 * Check R7121 and R7122. Voltage Resistance between U7100 Pin 27 -> 28 should be around 20 Ohm. Voltage on both pins around 8,5V.
 * Check R7151 and R7152. Voltage Resistance between U7100 Pin 17 -> 18 should be around 2 Ohm.
 * No image, bo backlight
 * Try known good screen
 * Check PP3V3_S0SW_LCD_UF. If 0V, check for shorts, L8304, U8300 and EDP_PANEL_PWR
 * -}
 * No image, bo backlight
 * Try known good screen
 * Check PP3V3_S0SW_LCD_UF. If 0V, check for shorts, L8304, U8300 and EDP_PANEL_PWR
 * -}
 * Check PP3V3_S0SW_LCD_UF. If 0V, check for shorts, L8304, U8300 and EDP_PANEL_PWR
 * -}