Ideapad V15 G2 - display shows nothing

[danny34]

Hello folks,
I have a Lenovo Ideapad V15 G2 with a Ryzen processor.

The owner damaged the motherboard with a knife while cleaning the ventilation slots on the bottom.
Pretty strange, but that's how it is.

I patched the 5 traces he cut.

The notebook now starts again, but does not produce any images. Neither via HDMI nor on the display.
But the display turns on, so it has its operating voltage and also 3.3V.

What signals does the display use to get the image? Unfortunately I have no experience with this.

Schematics:
https://www.badcaps.net/forum/troubl...-hs761-nm-d521

[reformatt]

How do you know if it's booting? What traces were cut? Depending on where it was, the metal knife could potentially have shorted 19V onto a data line into the CPU. Can't help much more than that without more info.

[danny34]

The conductor tracks are apparently all in direct contact with the processor.

I marked the “cut” in the picture red

[X_Link]

Hello. Check the resistance of damaged tracks relative to ground and between each other. Could the client have damaged the second layer? Remove the jumpers, wash off the flux from the board and look through a microscope. How to find out if the computer boots: if it boots, it will be accessible over the network. The laptop has an ethernet port. You can use wireshark to check the PC activity. Perhaps the laptop starts in recovery mode. To exclude this, you need to move the ssd drive to another computer on an amd processor (laptop / desktop) and check Windows boot. Or google towards bcdedit /set {current} recoveryenabled no.

*I used google translate