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...

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

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

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...

Hi everyone, the serial number is correct. I attach a photo of the plate with the model and serial number. Thank you...

Hi, in post 4 only 1 file works, the second EC.rar says invalid file

Hi, sorry, I'm posting the summary of my model: Lenovo ideapad 3 15iau7 NM-E341 serial number: PF4HXNH. I attach my files, they are .bin files, just delete the .rar. Thanks...

Hi, I also tried the Bios posted by Hairulole in post 75 but it doesn't work, same problem: 3 keyboard LEDs on, fan running for a few seconds and 600 Ma of absorption. The serial number of my PC (PF4HXNHB). A huge thank you to anyone who can help us

Ciao, mi chiamo Rosario, sono un tecnico in pensione, vivo in Italia e mi diverto ancora a riparare diversi tipi di schede elettroniche. Sono membro del forum da diversi anni e leggo sempre con interesse sia i problemi tecnici che le soluzioni proposte

The translator mistranslated: It draws 600 mA...

Hi everyone, I have a Lenovo ideapad 3 15iau7 main board NM-E341 PC which showed no signs of life, I found the PC1502 and the PQ 5400 short circuited, replaced the faulty components and now the PC turns on, draws 600 but does not boot, black video, 3 LEDs on the keyboard are on. I checked the 2nd bios chip and the UB3 W25Q128 eeprom chip was unreadable, while I was able to read the UB2 W25R64 eeprom. I replaced the UB3 W25Q128 with a new one, I extracted the bios from the Lenovo site by putting the PC serial number PF4HXNHB, I extracted the 2 flashed files in the 2 eeproms but it continues to...

Hi everyone,
I'm Rosario, a retired technician but still with the desire to learn and continue in the challenges of new devices, I'm interested in PCs and mobile phones