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...
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