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Have yet another board with no power. 20V present but no current draw. Notice PP5V_G3S is unstable and pulsing. PM_SLP_S4_L - 0.0 PP5V_S5_LDO - 5.03 PPVIN_G3H_P3V3G3H - 12.3 and stable PPVIN_G3H_P5VG3S - 12.3 and stable PP3V3_G3H - 3.3 and stable P5VG3S_EN_DLY - pulses also Any suggestions...

Have another board . Found and isolated a short to U7800. Once U7800 is removed, the short is gone. Short is on PP3V3_G3H_PMU_VDDMAIN My question is can i replace this chip with one from a seller from china or does this have firmware or files specific to the board model, which would mean i...

Have this board that doesn't power on. I get 20v but no amp draw. Couple readings PPBUS_G3H = 12.6V PP3v3_G3H = 3.3V PP1V8_SLPS2R = 1.8V PP1V8_AWAKE = 1.8V PP1V1_SLPS2R = 1.1V PP0V8_SLPS2R = 0.8V PP3V3_AWAKE = 3.3V PP1V2_AWAKE = 1.2V PMU_PVDDMAIN_EN = 3.3V P3V3MAIN_PGOOD = 3.26V PP3V_G3H_RTC =...

Yes, 5v on L3500 ans LB700 with usb drive connected to each ports

Now that i have the board working, no usb activity other than a flash upon initial plug in. I do have PP5V_S0 at 5.1v. Any suggestions on what else to check on this board? Could it be related to the corrosion i had cleaned up on and around U8190, U1830 and U8192, and Q440?

This board came with no power. Noticed it's missing D3312 and D3328. Could these two be possibly causing my no power issue and if so, does anyone know what the part description is so that i can order them?

Have a board that I need to replace the Touch ID as the cable was ripped. Has anyone found a way to pair a new Touch ID to a different board?

Found the issue while checking U7650. C7651 was broken off pad 1 side. Once fixed, board now comes to life. Thanks again for the assist.

PM_EN_PVXS5 - 3.4 SSD_PWR_REQ - 0.14 PMIC_EN_P3V3S5 - 3.4

PP5V_PMICLDO - 0.47 PP1V25_PMICVREF - 0.49 PPBUS_PMIC - 13.07 Not sure what i did before but i remeasured the below with the following voltages. PP5V_PMICLDO - 5.0 PP1V25_PMICVREF - 1.25

PP3V3_S5 - 0 PP3V3_PMICLDO - 3.3 PP3V3_SUS - 0 PP1V8_S3 - 0 S5_PWRGD - 0 PP3V3_S0 - 0 PM_SLP_S4_L - 0 SMC_PM_G2_EN - 3.4 P1V8S3_EN - 0 PP3V0_G3H - 3.1 PP5V_S4 - 0.37 PP5V_PMICLDO - 0.01 PP1V25_PMICVREF - 0

PPBUS_G3H - 13.06 Going to put the board back in to see if it charges U7800 pins 7 and 10 are ground pins.

Board isn't powering up. Found corrosion on and around U8190, U1830 and U8192, and Q440. Along with the corrosion, UB400 was cycling on and off. Once the corrosion was cleaned, the cycle was fixed and we now have 20v on all 4 usb-c ports. Also, replaced R1452 due to it being corroded. But the...

Ordered the transistors. While I wait, checked a few readings, is it normal for PP1V0_S5_REG to measure at 22 ohms and drop down to almost zero when i place a hot soldering iron on top of U1100

Have this iMac 27” (haven’t done much work on these) that isn’t powering up. Led 1 is blinking, so Swapped power supply with same outcome. Led1 is solid with cpu removed, so replaced the cpu with the same outcome. Note, when the power button is pressed, led1 blinks a lot faster. Any suggestions...

Ended up being U8005 pulling 5v_s0 close to ground resistance. Now fixed. Thanks for the assist.

It flashes on then off once, then finally back on and stays solid

Have this board that doesn't power up, found PP5V_S0_CPUVR - 1.19v PP5V_S3 - 5.1v isolated to both Q7310 and Q7320 to be blow, short between pins 4 and 1,2,3 pins. Resistance reading of about 2ohms. Resistance reading of just pins 1,2,3 to ground is 12ohms, which matches a good board...

Yes to USB activity, no to external video. Tried both a desktop monitor and TV with same result.

I have this board that doesn't have image to the screen (no backlight or image). The owner states it had a Shorted out keyboard/trackpad and the has screen issues intermittently. I've tried a new display with the same outcome. Here are some measurements taken so far. This will be my first no...