Lenovo V15-IIL 82C5 Bios please

[Giggle2562]

Thank you very much for the BIOS file.

I have flashed the new BIOS you provided. I also ordered a new 90W power supply, which has arrived, so I am sure it's not a power adapter issue.

Unfortunately, the problem still occurs, but I have noticed some more specific symptoms:

• When I install the RAM: The laptop powers on (LEDs blink, fan spins), but the screen does not turn on at all. It shuts down after a few moments.
• If I try to start it without the RAM installed: The screen does turn on for a moment (LEDs blink, fan spins), shows a "No bootable device" message, and then it shuts down.

What I've also noticed is that after it shuts down (in either scenario), it won't turn on again. I have to disconnect both the AC adapter and the internal battery before it will attempt to power on again.

Is this still likely a BIOS issue, or should I start looking for a hardware fault elsewhere?

Any advice would be greatly appreciated. Thank

[m1ch43lzm]

Maybe you received a faulty motherboard, or another part from the laptop is faulty
Test only motherboard and screen, nothing else connected (no keyboard, no touchpad, no I/O board, no WiFi, no SSD, no RTC battery)
With RTC battery removed it should turn on upon connecting AC adapter, otherwise find the alternate power button pads at J4501 or J4502 (or pins 1-2 at the keyboard connector) and momentarily short with tweezers to turn on the laptop

[Giggle2562]

Thank you for that advice.

I followed your suggestion and tested the motherboard with minimal components. This led me to a very important discovery:

The laptop starts up and works without any problem as long as the internal display (LCD screen) is disconnected. It boots correctly, and I can also use it perfectly fine on an external monitor via the HDMI port.

The original problem immediately returns as soon as I plug the internal display back in. The laptop will power on, the screen lights up for a moment and looks normal, but after a second, it all shuts down. (And again, I have to disconnect the battery and AC adapter to get it to power on again).

The screen itself looks physically fine. I'm wondering if this is a compatibility issue? The display panel is from a V15-IKB model. Is it possible that a BIOS modification is needed to correctly support this specific screen?

What other steps can I take to fix this? Could this be a bad display cable, the screen itself (drawing too much power), or a fault on the motherboard's display power circuit?

[m1ch43lzm]

Screen is the same, Lenovo parts website lists 3 screens for the V15-IKB
5D10R41288
5D10R41285
5D10R41287
https://pcsupport.lenovo.com/us/en/p...lay/compatible

And for V15-IIL
https://pcsupport.lenovo.com/us/en/p...splay/as-built
The same part numbers
Maybe the display cable is faulty, or the webcam? Looks like something is making a short circuit to me, that's why laptop powers off and doesn't turn on again
You may open a new thread in the troubleshooting laptops section, as the BIOS isn't an issue
https://www.badcaps.net/forum/troubl...mobile-devices