When the device is turned off, the screen stops working.

[hazy gust]

Device: Lenovo Legion Pro 5

I have a problem that I have been facing for a while now. With prolonged or light use, when I turn off the device or restart it, everything works except the screen remains completely black, I connected the device to an external monitor, but nothing appeared on the external monitor, just like it did with the main monitor.

I don't use heavy software or even heavy games, just for work and some League of Legends and Apex Legends.
The last time I changed the thermal paste was a year ago, and I also bought a new charger cable because the original one broke. I also use Windows Ghost
(I'm sharing this information in the hope that it will help solve the problem).

When I turn the device on after a while, for example "the next day" or "after two days," it works perfectly normally again, but when I turn it off, the problem returns. Also, when I updated to the latest version of Nvidia, the same problem occurred during the update process.

[fervent rampart]

Try an EC reset before you panic

https://discord.com/channels/761178912230473768/1023160421517099028

@hazy gust

[hazy gust]

How? Should I change the thermal paste?

[fervent rampart]

See linked guide on how to do it

[fervent rampart]

What thermal paste did you use?

[hazy gust]

I'll try to find it, thank you.

I think its name is x4 or something like that.

[fervent rampart]

Arctic MX4?

[hazy gust]

M

MX-6

[fervent rampart]

@hot minnow we have another mx-6 victim

[hazy gust]

What does that mean?

[fervent rampart]

You have to use Honeywell PTM on gaming laptops or a similar phase change thermal compound, anything else will pump out after a few weeks causing the laptop to start running much hotter than intended

This isn't just a legion thing, this is an "all modern gaming laptops" thing

[hazy gust]

I will look for it

Is this the reason in your opinion?

[fervent rampart]

I'm not gonna say it's the reason, I wouldn't be surprised if it's a factor though. The solder supposedly fails from excess heat so...

[hazy gust]

Okay, let's outline the steps. What do I need to do now?

[fervent rampart]

Try an EC reset, both quick and full

See if that makes your laptop work normally again

If not, then most likely the damage is already done and it's too late for your motherboard

If it does make your laptop work normally again, then buy some PTM and repaste with PTM

[hazy gust]

Hmm, is there a possibility that I might have to change the motherboard?

[fervent rampart]

Yes.

[hazy gust]

There is no hole throughout the device.

[hazy gust]

Is this what you're talking about?

[fervent rampart]

These just look like generic thermal pads, not honeywell PTM

[hot minnow]

Not again