Lenovo Legion S7 15ACH6

[peste]

Hi! If possible, I need to disable the onboard RAM as it has issues with the solder joints under one or more of the chips.

My customer is not going to want to pay for reballing the onboard RAM or replacing it, so if there is a way to just disable the onboard memory I'm sure they will be ok with it and they can just buy higher capacity slotted RAM.

Thanks.

post the S/N, the motherboard model, the full name and model of the laptop,etc.

[ResoluteHawk]

Lenovo Legion S7 15ACH6
Serial Number: PF31VQ4K
Motherboard Model: BM5070_V1.4

Edit: Found the On Board RAM Disable script; Fingers crossed that this works.
Edit2: Did not work. All voltage rails are present but CPU and GPU do not get hot. No shorts are present and resistances on all rails are good. Using known good slotted RAM and the fans spin with keyboard lights, but no POST.

[hoaca388]

Lenovo Legion S7 15ACH6
Serial Number: PF31VQ4K
Motherboard Model: BM5070_V1.4

Edit: Found the On Board RAM Disable script; Fingers crossed that this works.
Edit2: Did not work. All voltage rails are present but CPU and GPU do not get hot. No shorts are present and resistances on all rails are good. Using known good slotted RAM and the fans spin with keyboard lights, but no POST.

Legion S7-15ACH6 Laptop (Lenovo) - Type 82K8

[ResoluteHawk]

Legion S7-15ACH6 Laptop (Lenovo) - Type 82K8

Thank you! I'll give this a shot on Monday.

[ResoluteHawk]

I put the BIOS that you posted through the disable RAM script and flashed it; I'm still running into the same problem.

If this script is actually doing what it's supposed to be doing, then I'm likely running into a problem with a dead chipset/APU, but this diagnosis doesn't make sense since all voltage rails are present with good resistances.

CPU and GPU are getting slightly warm but nowhere as hot as they should be for system power on, and the system is running for 5+ minutes. CPU and GPU VCORE voltages are present.

I have no other ideas at this point.

[tuthanh]

HELP ME BIOS EC BM5070 V1.4 (ITE 5576-128)

[SMDFlea]

HELP ME BIOS EC BM5070 V1.4 (ITE 5576-128)

https://www.badcaps.net/forum/troubl...before-posting post your laptop serial number

[tuthanh]

legion s7 15ACH6
S\N:PF3K62FJ
VER:BM5070_V1.4
Thanks

[SMDFlea]

legion s7 15ACH6
S\N:PF3K62FJ
VER:BM5070_V1.4
Thanks

EC

[Navid_AJR]

Same issue for me. My laptop got a power failure during bios updating and now it won't power on at all.
Lenovo Legion S7 15ACH6
S/N: PF2XWM03

Thak you in advance.

[peste]

Same issue for me. My laptop got a power failure during bios updating and now it won't power on at all.
Lenovo Legion S7 15ACH6
S/N: PF2XWM03

Thak you in advance.

post the contents of the bios chip even if it is corrupted..

[Navid_AJR]

post the contents of the bios chip even if it is corrupted..

Thanks for the reply.

Just to clarify: this laptop has already been through multiple repair shops, and several different BIOS files have been flashed to it — none of them worked. Unfortunately, in the country I live in, getting access to verified BIOS files is very difficult due to various limitations.

At this point, I'm only looking for a verified, clean BIOS dump that exactly matches my machine:
- Model: Lenovo Legion S7 15ACH6
- Serial Number: PF2XWM03

If you or anyone else has a known-good dump from a working unit of the same model, I would be truly grateful. Honestly, I had given up on this laptop — but today I decided to give it one last try and reach out here for help.

Thanks again for your time and support.

[peste]

Thanks for the reply.

Just to clarify: this laptop has already been through multiple repair shops, and several different BIOS files have been flashed to it — none of them worked. Unfortunately, in the country I live in, getting access to verified BIOS files is very difficult due to various limitations.

At this point, I'm only looking for a verified, clean BIOS dump that exactly matches my machine:
- Model: Lenovo Legion S7 15ACH6
- Serial Number: PF2XWM03

If you or anyone else has a known-good dump from a working unit of the same model, I would be truly grateful. Honestly, I had given up on this laptop — but today I decided to give it one last try and reach out here for help.

Thanks again for your time and support.

you have everything you need at post #6..

https://www.badcaps.net/forum/troubl...h6#post1824992

[za8zak1]

Legion S7-15ACH6 Laptop (Lenovo) - Type 82K8
SN: PF375S3Q
Motherboard Model: LENOVO LNVNB161216
Bios Version: HACN46WW

Hi,
If possible, may I request the previous BIOS version? Right now, my laptop is unable to detect peripheral devices on both USB-C ports on the right side. I have already tried many things, such as updating drivers, performing a soft reset (holding the button for 30 seconds), and installing a fresh copy of Windows.
The odd thing is, I’m still able to use USB-C to charge the laptop with a 100W charger. Also, if I connect a USB-C hub powered by a 100W supply, I’m able to use peripheral devices. However, when in the BIOS settings, the USB-C ports are unable to detect anything.

Thanks in advance.

[peste]

Legion S7-15ACH6 Laptop (Lenovo) - Type 82K8
SN: PF375S3Q
Motherboard Model: LENOVO LNVNB161216
Bios Version: HACN46WW

Hi,
If possible, may I request the previous BIOS version? Right now, my laptop is unable to detect peripheral devices on both USB-C ports on the right side. I have already tried many things, such as updating drivers, performing a soft reset (holding the button for 30 seconds), and installing a fresh copy of Windows.
The odd thing is, I’m still able to use USB-C to charge the laptop with a 100W charger. Also, if I connect a USB-C hub powered by a 100W supply, I’m able to use peripheral devices. However, when in the BIOS settings, the USB-C ports are unable to detect anything.

Thanks in advance.

Do you have other USB-C ports? Does it work on those?

[za8zak1]

Do you have other USB-C ports? Does it work on those?

I don’t have other USB-C ports on this laptop—only the two on the right side, and both are experiencing the same issue. The USB-A ports at the back are working fine. Since this problem started after the BIOS update, I would like to request the previous BIOS version to check if that resolves the issue.

[peste]

I don’t have other USB-C ports on this laptop—only the two on the right side, and both are experiencing the same issue. The USB-A ports at the back are working fine. Since this problem started after the BIOS update, I would like to request the previous BIOS version to check if that resolves the issue.

you have everything you need at post #6...
https://www.badcaps.net/forum/troubl...h6#post1824992

[m1ch43lzm]

https://download.lenovo.com/consumer...s/hacn39ww.exe
https://download.lenovo.com/consumer...s/hacn42ww.exe
https://download.lenovo.com/consumer...s/hacn43ww.exe

The trick is to rename the download link, sometimes that won't work anymore as Lenovo removes old versions from their website
But I don't think it's a BIOS issue, it may be hardware problem such as dirty/oxidized contacts/moisture on the ports themselves, get a USB-C voltage tester