Lenovo Legion 5 15IMH05 power issue

[koby058]

Hi

A small amount of water spilled on this laptop keyboard. only two diodes i think got a little bit corrosion. Schematics

after flashing a bios by programmer the laptop turns on only when i connect the charger. (When got to windows i flashed latest bios.)

after i shut down the laptop it will not turn on by power button nor by charger connected. only when i disconnect the battery and the 3V coin cell battery it will power on when connecting the charger.

3v present on the power button.

Can you help me understand this and how to continue inspection ?

attached the corrosion part photos.

[Sephir0th]

Re: Lenovo Legion 5 15IMH05 power issue

This could be still a BIOS issue. However, you have shared the wrong schematics which makes it hard to assist from the beginning. Board number is NM-C921, no?

[koby058]

Re: Lenovo Legion 5 15IMH05 power issue

Correct, i can see its the wrong link.

I am sorry about that. it was an honest mistake.

Here is the correct schematics

What do you think is possible to do with this laptop?

Managers can you please remove post #3?

[mcplslg123]

Re: Lenovo Legion 5 15IMH05 power issue

Check RTC section.

[koby058]

Re: Lenovo Legion 5 15IMH05 power issue

Hi thanks, can you please elaborate ?

I did measure resistance on rtc batt connector and saw no short.

also when batt is connected i can see the 3 volt on pin #1 on PD201

Also, measured PD201 in diode mode and the diode is fine

[mcplslg123]

Re: Lenovo Legion 5 15IMH05 power issue

Rtcrst#
srtcrst#