Repair Help Lenovo Yoga Slim 7 15ITL05 bootloop after crash

[greenparrot]

Laptop Brand

Lenovo

Mobo Part No

DALS2BMBAG0 Rev G

Laptop Model No

15ITL05

Hello. I have a problem that I really don't know how to proceed with.

My almost brand new Lenovo Yoga Slim 7 fell from ca. 50cm height on the corner where the power button is located. It was in a protective enclosure, but it hit exactly the corner unfortunately so it cracked nevertheless.

I've disassembled the unit and initially thought the power button was just stuck (which it indeed was). After the plastic button removed, I can now confirm that the device is generally working (display works flawlessly, CPU works, RAM works, SSD works) because the operating system boots. It asks me for my credentials and I can log in.

That is, for about 43 seconds. After pretty much always precisely 43 seconds, the device just hard resets.

I am very puzzled about this behavior. I'm thinking maybe some sensor has sheared off in the crash and when the board doeesn't find that sensor for X amount of time, it executes a watchdog reset. Or is there any other reason that would explain this?

Thanks for your help in advance. All the best!

 

[Laptechinfo]

Hello. I have a problem that I really don't know how to proceed with.

My almost brand new Lenovo Yoga Slim 7 fell from ca. 50cm height on the corner where the power button is located. It was in a protective enclosure, but it hit exactly the corner unfortunately so it cracked nevertheless.

I've disassembled the unit and initially thought the power button was just stuck (which it indeed was). After the plastic button removed, I can now confirm that the device is generally working (display works flawlessly, CPU works, RAM works, SSD works) because the operating system boots. It asks me for my credentials and I can log in.

That is, for about 43 seconds. After pretty much always precisely 43 seconds, the device just hard resets.

I am very puzzled about this behavior. I'm thinking maybe some sensor has sheared off in the crash and when the board doeesn't find that sensor for X amount of time, it executes a watchdog reset. Or is there any other reason that would explain this?

Thanks for your help in advance. All the best!

Did you chech your laptop getting heat abnormally? Or there might be thermal trip sensor circuitry got issues, provide your motherboard's part number

 

[greenparrot]

Did you chech your laptop getting heat abnormally? Or there might be thermal trip sensor circuitry got issues, provide your motherboard's part number

It's not getting too hot, but your idea seems to be a great lead. I would expect if it were actually overheating for the duration to decline from time to time (since it's already hot) but since it's always 43 seconds it might be that a sensor has ripped off and then it's just panic resetting the computer?

I've checked the booard and believe the Mobo Part is DALS2BMBAG0 Rev G. Any chance there's a schematic for this somewhere to be found? Thank you so much for the help.

 

[Laptechinfo]

It's not getting too hot, but your idea seems to be a great lead. I would expect if it were actually overheating for the duration to decline from time to time (since it's already hot) but since it's always 43 seconds it might be that a sensor has ripped off and then it's just panic resetting the computer?

I've checked the booard and believe the Mobo Part is DALS2BMBAG0 Rev G. Any chance there's a schematic for this somewhere to be found? Thank you so much for the help.

let me check for the Schematic and i will upload it ...

 

[greenparrot]

That would be fantastic, thank you so much!

 

[Laptechinfo]

@greenparrot can you upload photo of the part number. to make sure.

 

[greenparrot]

Sure thing, here you go! I've made pictures of pretty much any indicator on the board so that if I've accidently picked the wrong MB part #, it should be included in the pictures.

 

[Laptechinfo]

@greenparrot sorry bro, schematic not available

 

[greenparrot]

:-( Thank you so much for looking tho.
Without schematic, it's going to be very difficult to trace the issue.

 

[Laptechinfo]

:-( Thank you so much for looking tho.
Without schematic, it's going to be very difficult to trace the issue.

Yes .. but some assumption we can decide,
Is that exactly 43 seconds ?

Did you try to keep bios screen ...

What is the SIO part number .. let's check that pins with SIO schematics,