Lenovo 330-17-ikb, PowerLED on but nothing else

[ITFan]

Hello dear forum members,

I have a friend's laptop (Lenovo 330-17-ikb) here that can be switched on (PowerLed lights up), but there is no picture and the fan is not running (CPU cold).
The battery is charging. If you switch off the laptop with the power supply plugged in, it switches on again immediately.
I didn't notice anything on the board when I first opened it. Only one thing, if you don't have the power supply plugged in and then switch it off, it stays off. Strange.

Then I removed the board completely because of strange smell and found a burnt chip which is probably an AON7408L_DFN8-5 according to the schematic.
I carefully cleaned it with isopropanol and the burnt top ‘cap' fell off. Underneath you can see the metal components, which can be folded up but are still connected to the pads.
Could these be the solder pads with the metal inside the chip?
Is it worth buying an AON7408L_DFN8-5 for a few euros and reattaching it somehow?

Then I also found that the LVDS cable was defective (like in picture), pins were crossed,
maybe a connection to the error of burned chip?
i aks, because unfortunately I don't have as much knowledge as I would like but I'm happy to learn. I am looking forward to your opinion and recommendation.

Best regards and have a nice Sunday
ITFan

[mon2]

Hi.

1) The LVDS cable should be replaced.

1PCS-10PCS NEW LCD LVDS Flex Cable for Lenovo IdeaPad 320-17 320-17IKB 320-17ISK 320-17ABR 320-17AST 330-17IKB DC02001YH10 - AliExpress 7

2) The high side mosfet @ PQ500 blew up for a reason. Clean up the region with IPA (medical grade alcohol - Costco pharmacy stuff is great) & cotton swabs / Q-tips.

3) With no power to the board, measure the resistance to ground of the inductor on this rail @ PL501 (either side is ok). Checking if there is lower than usual resistance to ground on this low voltage power rail.

4) Yes, do source (a few) of these mosfets for the replacement. Concern is if the 1v2 rail and parts on this rail were hit with the high voltage of 20v during this event.

In this repair, replace the high side PQ500 mosfet and also the low side PQ501 mosfet as a precaution.

PQ500 = AON7408
(10piece)100% New AON7401 AON7402 AON7403 AON7406 AON7407 AON7408 AON7409 AON7410 AON7412 AON7400A AON7516 AON7405 AON7414 QFN-8 - AliExpress


PQ501 = AON7506
(5piece)100% New AON7506 AO7506 7506 AON7518 AO7518 7518 QFN-8 Chipset - AliExpress 502