Lenovo Yoga C940-15IRH - jank issues

[compcellinfo]

Have a customer's C940-15IRH that they brought in for a screen replacement that won't boot now. Appears to complete a POST, display backlight comes on, but then when it tries to boot it restarts. I can get into the BIOS with the Novo button, and I can change boot options (tried Linux, didn't work.)

Changing settings (I updated RTC and tried turning off Secure Boot) seems to take, but when I F10 I get the message:

Formset (Configuration) AB72D350-82B0-402A-84C8-164BB7DEB828 Failed to save storage: SaSetup. Status: Security Violation.

Changing SGX setting to off or software-controlled does not take.

Strangely, Intel Platform Trust Technology is grayed out and says "MFG MODE".

Can someone help us get this fixed, assuming it's a BIOS issue? (We've tried with the display disconnected and it does the same thing over HDMI, so I don't think it's anything we did wrong.)

Model 81TE, S/N R90WBDWE.

BIOS dump attached.

[hoaca388]

Have a customer's C940-15IRH that they brought in for a screen replacement that won't boot now. Appears to complete a POST, display backlight comes on, but then when it tries to boot it restarts. I can get into the BIOS with the Novo button, and I can change boot options (tried Linux, didn't work.)

Changing settings (I updated RTC and tried turning off Secure Boot) seems to take, but when I F10 I get the message:

Formset (Configuration) AB72D350-82B0-402A-84C8-164BB7DEB828 Failed to save storage: SaSetup. Status: Security Violation.

Changing SGX setting to off or software-controlled does not take.

Strangely, Intel Platform Trust Technology is grayed out and says "MFG MODE".

Can someone help us get this fixed, assuming it's a BIOS issue? (We've tried with the display disconnected and it does the same thing over HDMI, so I don't think it's anything we did wrong.)

Model 81TE, S/N R90WBDWE.

BIOS dump attached.

Yoga C940-15IRH Laptop (ideapad) - Type 81TE

[hoaca388]

Have a customer's C940-15IRH that they brought in for a screen replacement that won't boot now. Appears to complete a POST, display backlight comes on, but then when it tries to boot it restarts. I can get into the BIOS with the Novo button, and I can change boot options (tried Linux, didn't work.)

Changing settings (I updated RTC and tried turning off Secure Boot) seems to take, but when I F10 I get the message:

Formset (Configuration) AB72D350-82B0-402A-84C8-164BB7DEB828 Failed to save storage: SaSetup. Status: Security Violation.

Changing SGX setting to off or software-controlled does not take.

Strangely, Intel Platform Trust Technology is grayed out and says "MFG MODE".

Can someone help us get this fixed, assuming it's a BIOS issue? (We've tried with the display disconnected and it does the same thing over HDMI, so I don't think it's anything we did wrong.)

Model 81TE, S/N R90WBDWE.

BIOS dump attached.

Yoga C940-15IRH Laptop (ideapad) - Type 81TE

[compcellinfo]

Yoga C940-15IRH Laptop (ideapad) - Type 81TE

*sigh* programmed the chip and the board is completely unresponsive now. Dumped the contents and they don't match what we flashed so I suspect the chip is bad now. Ordering a couple new chips to try...

[compcellinfo]

Yoga C940-15IRH Laptop (ideapad) - Type 81TE

Nice! After replacing the faulty BIOS chip the computer boots up normally now. The BIOS setup page still says PTT is in "MFG MODE" for some reason, and I'm not sure if that's a problem or not really, but if the computer works the customer will be happy. Any way we can tip/reward you for your help or is that allowed here?

[Vesko356]

No, it's not allowed, but you can donate in support of the forum. Donation link will be added soon.

[compcellinfo]

Whoops, should have checked the rules first. Well, accept our profuse thanks, please!