Recently, I had the same problem, and it was resolved by flashing the EC controller and selecting the correct BIOS.
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I've already solved the problem! There was no diode on the SPI flash power, so I installed it. I also reprogrammed the MEC1663 and the SPI flash, and everything started working! Thanks to everyone who responded.

I tried that, but it didn't help....

Hey! I bought a Lenovo T14 Gen1 i7 10 nm-C931 (a brick). The previous owner said he got it on eBay as a password-locked device and took it to a repair service, where they tried flashing something. The result: it doesn't turn on.

When I plug in the charger, the charging LED lights up, and the power button indicator blinks three times.

I downloaded the firmware from the official website, but it's incomplete. However, there is a firmware for the embedded controller (MEC1663). I did a mass erase via OpenOCD, wiped MEC1663 along with the EEPROM, and flashed an image from the...

Here are the dumps.
[ATTACH]n3598784[/ATTACH]...

Hello! I'm looking for BIOS and EC (MEC-1663) dumps for flash and EEPROM. I bought a laptop on OLX, but it doesn't turn on. When I connect the power, the power button LED blinks three times, and nothing else happens. The previous owner said the laptop was flashed using a programmer, so I'm not sure if the correct firmware is installed.

thinkpad t14 gen1
mb: NM-931 rev:1.0
serial: PF-2L6LYC
type: 20S0-002NUS​...