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Good morning, I am trying to repair this mac, I have already replaced the u3900 and u1900, but no solution so far. Do you have any idea what it could be ?

What can it be?

replaces it, but nothing has changed.

help?

Voltage and diode mode: L7610 oscillating /0.130V L7650 oscillating /0.165V L7760 0v /.106V L7110 0v /.021V L7130 0v /.022V L7130 0v /.022V L8100 0v /.169V

??

12.05V, stable. LE0301 is blinking.

I replace it, but the LED continues to blink.

Good afternoon, I don't know much about iMac. Voltage: SMC_PM_G2_EN oscillating. PP12V_S0 0V PP3V3_S0 0V. PP3V3_S5 oscillating

I have replaced the surrounding components, in tests it shows the same defect. The u7100 and the surrounding components are ok.

Replaces u7100, in tests the cooler does not move. voltage values after replacement of u7100 Voltage: L7770 1.5V L7700 1.2V L3895 2.54V L7760 1.8V L7520 0V L7510 0V L7550 0V L7330 1.5V L7030 12.6V L7260 5.085V L7220 3.32V L7100 10mV L7630 1.056

PVCCSA_EN 3.23V PP5V_S0_VCCSAS0_VCC 5.084V PP5V_S0 5.087V

All_SYS 51mV, no pulse. Coils Voltage: L7770 1.5V L7700 0.094V L3895 2.54V L7760 1.8V L7520 0V L7510 0V L7550 0V L7330 1.5V L7030 12.6V L7260 5.085V L7220 3.32V L7100 10mV L7630 1.055V diode mode: L7770 0.349V L7700 0.267V L3895 0.527V L7760 0.175V L7520/L7510/L7550 0.005V L7330...

I have suspended the components around, it now shows 1.8V on the L7760 coil, but the fan does not turn. I noticed that in the thermal camera the component u3900 gets hot.

40mV, pulse 3.186V removed. I checked the resistor values, they are ok.

Here is a video of how it works. Yes, but it does not accept the SMC bypass mode. Coils: L7030 8.44V L7260 3.35V L7220 0V, oscillating 4.45V. L7100 0V, pulsing. L7630 0V, pulsing. L7330 0V, 0.173V, pulsing. L7550 0V. L7510 0V.

yes.

3.27V

Hey info, this mac suffered oxidation on the components Q7830, U6100, U5010, U3890 and Q9706. I replaced the oxidized components, but the fan speeds up and stops. Voltage: PPbus_g3h 8.41V; PP3v42 3.41V; SMC_BCACOK 3.35V SMC_RESET_L 3.32V PCH_SRTCRST_L 3.107V RTC_RESET_L 3.24V SMC_ADAPTER_EN...

Help ?