A1466 820-3209-A not power on

[bushmann]

Apple not power on.
Charging battery normal work.

Please can you help where is problem.
the measured values of the signals are here.


PPBUS_G3H = 8,5V
PPVIN_G3H_P3V3G3H = 20V
PPBUS_S5_HS_COMPUTING_ISNS = 8,5V
PPVBUS_E85 = 20V
PPDCIN_G3H = 20V
PP3V3_G3H = 3,3V
PP3V3R3V0_AON = 3,3V
PPVRTC_G3H = 3,3V
PP5V_G3H_LDO = 5V
PP5V_S0SW_LCD = 0V
PP5V_S4 = 5V
PP5V_S0 = 150ms - 5V; 4s-0V cyclically V
PP3V3_S5 = 3,3V
PP3V3_SUS = 3,3V
PM_SLP_S5_L = 135ms - 3,3V ; 4s-0V cyclically
PP3V3_S4 = 135ms - 3,3V ; 4s-0V cyclically
PP1V8_S3 = 170ms - 1,7V ; 4s-0V cyclically
PP1V5_S0 = 135ms - 1,5V ; 4s-0V cyclically
PP1V2_S3 = 135ms - 1,1V ; 4s-0V cyclically
PP1V05_SUS = 1,1V
PP1V05_S4SW = 0V
PP5V1_S4SW = 0V
PPVCC_S0_CPU =130ms - 1,5V ; 4s-0V cyclically



thank you for your help

[mon2]

Re: A1466 820-3209-A not power on

Hi.

1) Remove all power. Meter in resistance mode. Check the resistance to ground for each and every coil on the board. You will be checking for very low resistance (< 10 ohms) which may denote a bad capacitor on that power rail and for that reason, the local power supply IC is turning off / on (chirp mode) to prevent damage.


2) Also review:

https://www.it-tech.com.au/mac-q-a/m...-up-sequences/

[bushmann]

Re: A1466 820-3209-A not power on

This is a measurement on coils.
There is nothing to see through the thermal imager.

L1270 = 305 ohm PP1V05_S0_PCH_VCCACLKPLL
L1275 = 302 Ohm PP1V05_S0_PCH_VCC_ICC
L1295 = 1,6 Kohm PP1V05_S0SW_PCH_VCCUSB3PLL
L3901 = 1,35 Kohm PP1V2_CAM
L3902 = 1,85 Kohm PP1V35_CAM
L3903 = 3,55 Kohm PP1V2_CAM_PCIE_VDD_FLT
L3904 = 3,55 Kohm PP1V2_CAM_PCIE_PVDD_FLT
L3906 = 1,8 Kohm PP1V35_DDR_CLK
L4007 = 1,2 MOhm MIPI_DATA_N/P
L4009 = 1,2 MOhm MIPI_CLK_P/N
L4010 = 4,5 MOhm PP5V_S0_ALSCAM_F
L4405 = 0,9 MOhm USB_EXTA_P/N
L4800 = 0,6 MOhm PPBUS_G3H_TPAD_FLT
L4801 = 0,6 MOhm PP3V3_G3H_KBD_F
L4802 = 5,4 Kohm PP3V3_S4_TPAD_F
L4803 = 4 MOhm PP5V_S4_TPAD_F
L4804 = 54 Kohm PP5V_S0_KBD_F
L5001 = 0,7 MOhm PP3V3_S5_SMC_VDDA
L7095 = 2 MOhm P3V3G3H_SW
L7130 = 2 MOhm CHGR_PHASE
L7310 = 65 Ohm PPVCC_S0_CPU_PH1
L7320 = 66 Ohm PPVCC_S0_CPU_PH2
L7430 = 380 Ohm PDDR_S3_PHASE
L7510 = 0,9 MOhm PP5V_S4
L7520 = 5 MOhm PP5V_S0
L7560 = 3 Kohm PP3V3_S5
L7561 = 2,2 MOhm PP3V3_S0SW_SSD
L7562 = 3,2 kohm PP3V3_S0
L7630 = 260 ohm PP1V05_SUS
L7710 = 0,5 MOhm PPBUS_S0_LCDBKLT_PWR_SW
L7820 = 0,9 MOhm PP1V8_S3
L7830 = 14 Kohm PP1V05_S4SW
L7850 = 50 Kohm PP5V1_S4SW
L7890 = 89 ohm PP1V1_S0SW_SSD

[bushmann]

Re: A1466 820-3209-A not power on

Sorry, its my mistake.
This is other motherboard .

[bushmann]

Re: A1466 820-3209-A not power on

Model A1534 - 820-00045-A

[bushmann]

Re: A1466 820-3209-A not power on

Not water damage and not any more damages.

[dellxps15]

Re: A1466 820-3209-A not power on

check why this voltage is low... maybe tantalum caps ? PP1V05_SUS = 1,1V trace it and see. pc goes till s4 and when tring to boot on s0 state something is wrong and cut off power.

check that PP1V05_SUS = 1,1V then check all s0 volts rail. also check allsys powergood if someone is missing, also if ic or pads near it are ok too.

[bushmann]

Re: A1466 820-3209-A not power on

Sorry, but what is wrong on this signal PP1V05_SUS = 1,05V voltage is OK.


today's measurement

ALL_SYS_PWRGD = 135ms - 3,3V ; 4s-0V cyclically
CPU_PWRGD = 0 V
CPU_VCCST_PWRGD = 0 V
PM_DSW_PWRGD = 3,3 V
S5_PWRGD = 3,3 V
SMC_DELAYED_PWRGD = 28ms - 3,3V ; 4,2s-0V cyclically
SMC_DSW_PWRGD = 3,3 V
XDP_CPU_VCCST_PWRGD = 135ms - 1V ; 4s-0V cyclically
AP_S0IX_WAKE_L = 4,2s - 3,3V ; 1ms-0V cyclically

[dellxps15]

Re: A1466 820-3209-A not power on

sorry, it was my bad reading.

report voltage of :
PM_SYSRST_L
PM_PCH_SYS_PWROK
PM_PCH_PWROK
PM_PCH_APWROK
PM_RSMRST_L
PM_PWRBTN_L
PM_BATLOW_L

report if voltage is stable or fluctuate.

[bushmann]

A1534 820-00045-A not power on

No problem



PM_SYSRST_L = 135ms - 3,3V ; 4s-0V cyclically

PM_PCH_SYS_PWROK = 135ms - 3,3V ; 4s-0V cyclically

PM_PCH_PWROK = 135ms - 3,3V ; 4s-0V cyclically

PM_PCH_APWROK = 135ms - 3,3V ; 4s-0V cyclically

PM_RSMRST_L = 3,3V

PM_PWRBTN_L = 3,3V

PM_BATLOW_L 3,3V

SMC_ONOFF_L = 3,3V after push the power button down to 0V and release button back to 3,3V


Thanks for your help.

[mon2]

Re: A1466 820-3209-A not power on

See attached.

Check & post the voltages for:

1) PP3V3_S5


2) PM_SLP_S3_L


3) PP3V3_S0

[bushmann]

Re: A1466 820-3209-A not power on

PP3V3_S5 = 3,3

PM_SLP_S3_L = 135ms - 3,3V ; 4s-0V cyclically

PP3V3_S0 = 135ms - 3,3V ; 4s-0V cyclically

[dellxps15]

Re: A1466 820-3209-A not power on

l7430 voltage ?

inspect area of u7400 ....

[bushmann]

Re: A1466 820-3209-A not power on

L7310 = 135ms - 1,8V ; 4s - 0V cyclically PPVCC_S0_CPU_PH1
L7320 = 135ms - 1,8V ; 4s - 0V cyclically PPVCC_S0_CPU_PH2
L7430=135ms - 1,2V ; 4s - 0V cyclically PDDR_S3_PHASE - PP1V2_S3
L7510 = 5V no pwm PP5V_S4 !!!!!!!!!!!!!!!!!!!!!
L7520 = 135ms - 5V ; 4s - 0V cyclically PP5V_S0
L7560 = 3,3V PP3V3_S5
L7561 = 135ms - 3,3V ; 4s - 0V cyclically PP3V3_S0SW_SSD
L7562 = 135ms - 3,3V ; 4s - 0V cyclically PP3V3_S0
L7630 = 1,05V PP1V05_SUS
L7710 = 0V PPBUS_S0_LCDBKLT_PWR_SW
L7820 = 135ms - 1,8V ; 4s - 0V cyclically PP1V8_S3
L7830 = 0V PP1V05_S4SW
L7850 = 0V PP5V1_S4SW
L7890 = 135ms - 1,1V ; 4s - 0V cyclically PP1V1_S0SW_SSD

[dellxps15]

Re: A1466 820-3209-A not power on

so you are misisng some volts. check u7830 and u7850 pin volts.

check r4666 volts both side,
check voltage of PP3V3R3V0_AON if stable at 3.3 volt

if u can u can try replace ISL95530HIZ-TR5655 u7100