A1466 2015-2017 13” MacBook Air

Logic board part number: 820-00165

{|class="wikitable" ! style="text-align:left;"| Problem ! Solution Example of dying U7090: https://www.youtube.com/watch?v=2D81CE5I3Hg
 * No green/orange light on charger
 * PP3V42_G3H missing due to short to ground, bad D7012, bad U7090, R7080 corroding away, bad or corroded capacitors in SMC area
 * PP3V42_G3H missing due to short to ground, bad D7012, bad U7090, R7080 corroding away, bad or corroded capacitors in SMC area
 * PP3V42_G3H missing due to short to ground, bad D7012, bad U7090, R7080 corroding away, bad or corroded capacitors in SMC area

Example of dead D7012: https://www.youtube.com/watch?v=ZbrgBKa4-OA

Example of corroded capacitors: https://www.youtube.com/watch?v=4L0ahpCzNk4 (draws 66mA, 2Ohm short to ground on PP3V42_G3H) Video: https://www.youtube.com/watch?v=9rrMa6GMbt8 Example: https://www.youtube.com/watch?v=HlQ-FUMcNy0 (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)
 * 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 Example: https://www.youtube.com/watch?v=-YWsaPdFnfM
 * SMC_RESET_L low due to corroded R5100 pullup resistor (PPBUS_G3H was 8.17V). Example: https://www.youtube.com/watch?v=yvjjnEYks5I
 * SMC_RESET_L low due to bad SMC or corrosion under the SMC
 * https://www.youtube.com/watch?v=9JcmJ6LHdWA
 * SMC_RESET_L low due to corrosion at the JTAG connector (see JTAG)
 * Bad R7010 or R7011 (DC in board cannot recognize Board and DC-IN Voltage is 0V)
 * With 6mA power draw: SMC bad/corrosion under SMC
 * With 6mA power draw: D7012 bad/corrosion on D7012
 * Corrosion at PP3V42_G3H and SMC reset area. This example also gives a brief explanation of how PP3V42_G3H causes the SMC to turn on which then turns on the green light: https://www.youtube.com/watch?v=7kvFqPFPRCs

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). Example: https://www.youtube.com/watch?v=7UBy7L3YzLg (Blown fuse on PPBUS_G3H, 0.4Ohm short to ground via PPBUS_S5_HS_ISNS) Example: https://www.youtube.com/watch?v=vHZG4eJSPOw Example: https://www.youtube.com/watch?v=uMNDHjo_vWQ (second board)
 * 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 https://www.youtube.com/watch?v=LTilng4Dugs
 * 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, 36 mA draw
 * Blown fuse on PPBUS_G3H (can be caused by short on another power rail connected to PPBUS)
 * No power, 36 mA draw
 * Blown fuse on PPBUS_G3H (can be caused by short on another power rail connected to PPBUS)
 * Blown fuse on PPBUS_G3H (can be caused by short on another power rail connected to PPBUS)
 * Green Light on charger, doesn't turn on
 * PP3V42 and PPBUS_G3H present, blown fuse on PPBUS_G3H. short on PPBUS_G3H caused by cracked capacitor. Capacitor removed, short is now gone. Capacitor and fuse replaced. https://www.youtube.com/watch?v=ZI9Su8X7OcA
 * PM_SLP_S4_L missing, corrosion on U1950. Cleaned SMC resistor and clock chip. https://www.youtube.com/watch?v=JD60de2x6Rs
 * No power, 40-65mA draw
 * U1930 bad. If damaged, this chip can short any of PM_SLP_S4_L, ALL_SYS_PWRGD or CPU_VCCST_PWRGD to ground. Example (U1930 pin 6 corroded, CPU_VCCST_PWRGD missing, 40-64mA power draw): https://www.youtube.com/watch?v=1AByavrsAhE
 * No power, 70 mA draw
 * Shorted cap PPVRTC_G3H (name not stated in video)
 * U1930 bad. If damaged, this chip can short any of PM_SLP_S4_L, ALL_SYS_PWRGD or CPU_VCCST_PWRGD to ground. Example (U1930 pin 6 corroded, CPU_VCCST_PWRGD missing, 40-64mA power draw): https://www.youtube.com/watch?v=1AByavrsAhE
 * No power, 70 mA draw
 * Shorted cap PPVRTC_G3H (name not stated in video)
 * Shorted cap PPVRTC_G3H (name not stated in video)
 * No power, 90 mA draw
 * Can be caused by a corroded probe point, see Visual inspection
 * Can be caused by a corroded probe point, see Visual inspection
 * Can be caused by a corroded probe point, see Visual inspection


 * Can be caused also by a dead PCH when PM_SLP_S4_L is down at 0.190V and you have 0.9V at PM_PWRBTN_L on the R1802
 * No power, 150 mA draw
 * in S0 Rail PGOOD is ALL_SYS_PWRGD failed, e.g. S0PGD_C fails: clean up and replace R8156 and R8153 and chip Q8150 (376S0854)
 * in S0 Rail PGOOD is ALL_SYS_PWRGD failed, e.g. S0PGD_C fails: clean up and replace R8156 and R8153 and chip Q8150 (376S0854)



Example: https://www.youtube.com/watch?v=-snMxmZXcgg (270mA draw, 1.2Ohm short to ground on PPBUS_G3H, caused by bad capacitor)
 * 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 (Short can be found by injecting 1V into the board and checking what gets hot)

Example: https://www.youtube.com/watch?v=ZlhvVesCgME (PP5V_S5 and PP3V3_S5 fluctuating, PP5V_S4 missing (Power rails associated with U7501). 0.6Ohm short to ground on PP5V_S4 (caused by bad capacitor C6401))
 * No power, fluctuating power draw
 * Can be caused by short on power rail (machine is trying to turn on but failing)

Example of bad backlight fuse: https://www.youtube.com/watch?v=QnowcxcO2-0 (5mV on backlight) Example: https://www.youtube.com/watch?v=KnrZgwpiGy4 (replaced ISL6259 (U7100) and Q7130)
 * No backlight
 * 0v - bad backlight fuse, short to ground inside connector/inside screen
 * 0v - bad backlight fuse, short to ground inside connector/inside screen
 * 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 or damage to DC in board connector. 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
 * 8v above and 0v below voltage divider: check resistance of R7731 (normal: 8V above, 2.7-3 below)
 * Voltage divider not working because C7782 is bad
 * Bad LED driver
 * No power, PPBUS_G3H 4v instead of 8.55v
 * Bad U7100, blown R7021/R7022
 * No power, PP3V42 present, 14mA power draw
 * TPS51980 bad -> replace
 * Not charging, PPBUS_G3H 17.5V
 * Corrosion or bad ISL6259 (U7100) and possible bad transistor Q7130
 * Not charging, PPBUS_G3H 17.5V
 * Corrosion or bad ISL6259 (U7100) and possible bad transistor Q7130
 * Corrosion or bad ISL6259 (U7100) and possible bad transistor Q7130
 * Any board level issue at all.
 * Look at J6100, and feel guilt free in killing it. Example: https://www.youtube.com/watch?v=-YWsaPdFnfM (corrosion at 3 of the pins was preventing the machine to turn on)
 * 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!
 * 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!
 * 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, no backlight
 * Try known good screen
 * Check PP3V3_S0SW_LCD_UF. If 0V, check for shorts, L8304, U8300 and EDP_PANEL_PWR
 * -}
 * No image, no 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
 * -}


 * Braindead
 * Corrosion under U1930 on pin 6
 * Bad SMC
 * Corrosion at U5110/U1900/U1950 Example: https://www.youtube.com/watch?v=5z98WJ0nLQ8 (no image on the screen (0V), board taking 240mA)
 * Some random issue you will never figure out - cry
 * USB Issues
 * For left side USB, try new DC in board/DC in cable
 * For right side USB issues, L4600/U4650 area - L4600 can be open, or U4650 shorted.
 * 600mA, Battery not charging
 * A known good battery displayed the same issue.
 * Current sense circuit (R7151, R7150 and R7152) was fine
 * Q7155 was replaced and this solved the problem.
 * Example: https://www.youtube.com/watch?v=5Yx_QcfemrQ
 * You think PPBUS_G3H is 8.55v
 * You measured the right side of the fuse, not the left side of the fuse, because you are right handed and keep the red probe of your multimeter in your right hand. Had you measured the left side of the fuse, you'd realize the fuse is blown, likely due to a short circuit. You are probably off in the wilderness, hunting why your PP3V3_S5 & PP5V_S5 are missing, before you even have PPBUS_G3H... we've all been there.
 * A known good battery displayed the same issue.
 * Current sense circuit (R7151, R7150 and R7152) was fine
 * Q7155 was replaced and this solved the problem.
 * Example: https://www.youtube.com/watch?v=5Yx_QcfemrQ
 * You think PPBUS_G3H is 8.55v
 * You measured the right side of the fuse, not the left side of the fuse, because you are right handed and keep the red probe of your multimeter in your right hand. Had you measured the left side of the fuse, you'd realize the fuse is blown, likely due to a short circuit. You are probably off in the wilderness, hunting why your PP3V3_S5 & PP5V_S5 are missing, before you even have PPBUS_G3H... we've all been there.
 * You measured the right side of the fuse, not the left side of the fuse, because you are right handed and keep the red probe of your multimeter in your right hand. Had you measured the left side of the fuse, you'd realize the fuse is blown, likely due to a short circuit. You are probably off in the wilderness, hunting why your PP3V3_S5 & PP5V_S5 are missing, before you even have PPBUS_G3H... we've all been there.


 * green or orange light, no charging. PPBUS_G3H is wrong
 * if battery empty, will appear as no sign of life otherwise works fine, doesnt charge
 * found corroded R7105 (20ohms)
 * PPBUS_G3H is 7.15v
 * found corroded R7105 (20ohms)
 * PPBUS_G3H is 7.15v


 * System does not power on.
 * Inspect the liquid damaged U7090 for corrosion and replace it. Example: https://www.youtube.com/watch?v=tkNncEh9xZE (How unauthorized INFLUENCERS fix Apple products)
 * Inspect the liquid damaged U7090 for corrosion and replace it. Example: https://www.youtube.com/watch?v=tkNncEh9xZE (How unauthorized INFLUENCERS fix Apple products)

But wont power on again once turned off
 * Powers on When battery is Removed & Power Cable connected
 * Powers on When battery is Removed & Power Cable connected
 * Inspect and Replace the Trackpad Flex Cable. Example: https://boards.rossmanngroup.com/threads/solved-a1466-macbook-air-820-3437-only-turns-on-after-smc-reset.17337/