Lenovo Ideapad U410 - TPS51220A

[Bimad99]

Hello everyone,

i have this lenovo laptop with power issues.
i tracked the problem down and i found the 5VPCU and 3VPCU are switching on and off continually, they are enabled with 5v LDO which causing the issue.

down below are pics of 5v LDO compared to 5VPCU and 3VPCU captured with DSO.
Yellow is 5v LDO
Blue is 5VPCU or 3VPCU

If anyone has any idea plz help and thanx in advance.

[Bimad99]

Re: Lenovo Ideapad U410 - TPS51220A

Any help ????

[Techtiger]

Re: Lenovo Ideapad U410 - TPS51220A

Are you experiencing a glitch in the output of PL9 and PL10? If so, replace PC221, PC165, PC150, and PC216 and check if there are any changes. Additionally, test if PU4 VIN is stable or not