Chosen Solution

Hi everyone,

I have a lenovo legion y520. I wanted to replace the keyboard because the O key wasnt working anymore. Its an embeded keyboard in this laptop. Anyway I replaced it. After that, I maybe damaged something in the motherboard. The cable linking the lcd screen and the mobo burnt because I connected it after the battery. So now I have several issues. First the powerbutton seems to be damaged Before :

https://www.noelshack.com/2019-50-6-1576… Mine :

https://www.noelshack.com/2019-50-6-1576… So I have to take a small aluminium circle that felt from the case to make contact with a circle area in the mobo. When I do that the Mobo start (white led) Here with the mobo only

https://ibb.co/XjpYBmC Here When i connect the IO cable with its interface I have two white leds

https://ibb.co/0f8s1C6 The fans wont spin I dont know if the fans have to spin anyway. I dont know how to test if something is damaged. Indeed the lcd cable seems to be burn so Even if I connect the laptop with a hmdi screen I have nothing. Look at this video I did : https://streamable.com/hzz5v Someone can help me troubleshooting this ? Sorry for my bad english ^^ Update (01/04/2020) The connector seems to be ok even if the plastic burnt a little. The metal connectors seems to not be damaged. But the lcd cable ( I ordered a new one) burned. Here some pictures

I dont know if the laptop is working or not because there is no display and the fans dont turn on…even if I plug a hdmi display. I heard that heating the Mobo can be a solution Mise à jour (09/01/2020) Thanks for your help. I ordered a power button and display cable. Do you think this kind of power button is OK ?

Also, is it possible that this screw is responsible for not let the laptop boot normally ?

Note that this part is connected with the CMOS. Normally the screw has to be in the metalic support like here

this part

By mistake screwed directly on mobo and…the screw is now broken impossible to extract, I will cut it gently to unscrew it with a flat screw driver. Update (01/09/2020)

The connector seems to be ok ?

oku ytr  okay so you want to start by repairing what you know has failed. Number one being your power switch. The fan will not come on since it is turned on/off by the thermal sensor (temperature depended). Your LCD cable should not heat up at all. The first thing to check is the cable end and the connector (should be JEDP1). Check the cable ends and the connector for burn spots, broken pins etc. Here are the schematics for your motherboard. You may need those after you replace the switch and investigate your LCD connector y520_mb_n17p SchematicY520 Test PointsY520_IO DB Update (01/04/2020) Okay definitely shows burn marks on connector and cable. That is where your short circuit comes from. Pin 5 is NA (not connected) but pin 6 is the power line for your LCD. Hard to see on the cable but it looks like the contacts burned off. you may need a new assembly or check to see if the cable itself is replaceable. You may also need a new LCD connector.

Hello, Have the same probleme with the power button of my LENOVO LEGION Y520-15IKBN I open it and here how is the power button on the mother board :

There clearly a missing part that I found on the speaker after my inspection :

And here zoomed :

I put the part back at it’s place :

and put a big piece of capton on it :

Now, the power button is fully operational.