Help me identify this IC chip on Lenovo Flex 7 14IAU7

[trepachka]

Looks like this IC chip got overheated and jumped off this motherboard as I was unable to find it anywhere. It is marked as U4201. There is a high-res photo of Lenovo Flex 5 14IAU7 and this chip is also marked as U4201 on it. So, both boards appear to be very similar.

It is supposed to be an overload circuit protector, I believe. I just do not know the exact make and model.

Can someone help me? Thank you

[trepachka]

Here is an image from another motherboard. The markings say "S A" and "J 5" underneath.

[SMDFlea]

What`s the motherboard model number..

[trepachka]

There isn't much printed on this motherboard. It has Lenovo Part# 5B21J23573 sticker on it.

I also found someone had posted a high-scan resolution photos of Flex 5 14IAU7 motherboard with similar layout. This board also has this component showing as U4201.

The board is LC57-IAU MB 213062 -1M.

[mon2]

The package is WLCSP10 and swear I have seen these already but cannot match the vendor, for now.

[trepachka]

I need a component with 2 rows of 5 pins each. I recently purchased a similar piece from Mouser that was intended for Yoga 9 14itl05:

https://www.mouser.com/ProductDetail...rrencyCode=USD

I do not know whether this is a match. I do not want to destroy the board in case it's a mismatch.

[mon2]

See if the PCB pads are grouped like the part you are referencing.

Check for continuity for

S1-S1

S2-S2

G1 should be isolated

G2 should be isolated

[trepachka]

So, I decided to take a chance and installed one of CSD87501L chips I had available. The board is working now. So, indeed CSD87501L can be used to replace U4201 chip on both Flex 5 and Flex 7 14IAU7 motherboards.

Thank you for your assistance.

[mon2]

Awesome. Good to know.

[trepachka]

FYI: same chip is being used in Lenovo Thinkbook 13s Gen 2 ITL. It is located less than an inch away from the charging port.