IdeaPad 3 15IAU7 problem

[ministeri]

Hi, I tried 2 bios files, it still doesn't work, 3 LEDs are lit on the keyboard, the only difference is the fan always runs while with other bios the fan runs for a few seconds and then stops, it absorbs 630 mA. I attach photos. I think there is still a hardware problem I hope someone with this problem has found the solution. the voltages are still not correct.
+1.6V_VCCCORE only provides 0.8 volts
+1.5V_VCCGT absent 0 volts,
+1.8V_VCCIN_AUX is ok 1.8 volts.
Thanks for your help

[ministeri]

Hi everyone, has anyone had the same problem and managed to fix it? Thank you

[mon2]

Does the board spike to 630mA immediately or climbs up to this value? If an immediate consumption of 63mA then very likely a shorted part is onboard, like a capacitor.

[ministeri]

Hi, thanks for the reply, no when turned off the consumption is 4 mA as soon as I turn on the current goes up to 400 - 500 ... 600 mA and the only component that heats is the PL1501 coil which outputs 1.8 volts which are correct, checking with the thermal camera you can't see anything else heating up. Browsing the web there are several computers similar to mine that have this same problem. Thank you

[mon2]

What is the voltage to ground @ PL1501? Is it stable or power cycling?

Remove all power, meter in resistance mode. What is the resistance to ground @ PL1501?

[ministeri]

HI. Yes, the voltage of 1.8 volts is stable, the resistance on the coil towards ground is 210 hom, and measured in a diode it is approximately 0.176 V. I attach a photo. in reality it is not the coil that heats but the MOS connected to it, the PQ1501 but the temperature does not exceed 35° celsius as you can see from the attached thermal photos. Thank you