Hi reformatt,

In fact, there is no liquid damage or corrosion. Initially I have started looking for something death, because when I opened the laptop, there were two screws, free rolling over the motherboard, so I was thinking that they made some king of a short. Those two guys were coming from the SSD support.

I can not check the VDDCR_SOC voltage for the moment, because I have removed couple of components (including the RT3662AC), but during the weenkend I will try to add them back. I will keep the post updated with this.

Regarding the Lenovo BGA problem,...

Some update:
- I saw that there is a very low impedance between the drain and source of PQ5905 (and all MOSFETs connected between the VDDC and GND), around 2.1 ohms.
1. Removed the RT3662AC - still the short is present;
2. Removed all MOSFETs (PQ5902, PQ5903, PQ5905, PQ5906, PQ5908), the short is still present;

Is it possible that the CPU is dead?

Thanks,
Mitko

Hello all,

I have a Lenovo Ideapad3 laptop, that has recently stopped working. When pressing the power button, the led is going on, but nothing else is happening.

I have checked the 3.3V, 5V and 20V - all of them seem present (checked with multimeter and oscilloscope in order to verify that they are stable).
I have checked the voltages around PU1901 - 0.9V, 1.8V, 5V, 2.5v, 0.6V and 1.2V - all of them are present.

Now going further in the debug, I found that the CPU voltages produced by RT3662AC (PU5901) PWM driver are missing. I can see that the 20V...

Hi all,

I am a new member from Bulgaria and I am doing some tests/repairs in during my free time.

Best regards,
Mitko

Hi Gil,

Have you managed to resolve this issue? I am asking this, because I have a faulty Lenovo Ideapad3 motherboard, and I am also suspecting the RT3662AC PWM controller.

Thanks,
Mitko...