Laptop issue

[pillar]

Hey all, yes I know its been a while since I've been on here. Anyways, my laptop recently crapped out on me. Here's my situation: I have a Lenovo Legion 5 model 15ach6. Currently has what's known as black screen issue. I've tried all the button pressing ideas with no dice. I decided to remove the bottom plastic to investigate the fans. I did find out that the air vents were very much clogged and that the thermal paste was very crusty, so cleaned all the dust out and decided to go ahead of reapply some paste. However, after doing all that, the laptop still won't power on. Also the laptop isn't under warranty and I can't afford to send the laptop in so that they can check into the issue.

Any ideas on what I can possibly look into?

 

[Euphoric]

I assume you already tried to do a hard reset?
If it doesn't power on at all, or no lights turn on.. could it be your battery? or your charger? Maybe a loose cable or where you plug in the charger. I know I have had that issue in the past on a laptop I used to have.

I copied and pasted your prompt to AI and it gave me quite a few suggestions as to what it could be, and what can be tried. I suggest doing that and looking into each one to see if any of that will fix it.

 

[blank_dvth]

You described it being a "black screen" issue and how it "won't power on". When you try to turn it on, do you see any indications of the laptop being functional (lights, fans moving, etc.)? Couldn't quite tell from your post.

If you do see indications of life, and the display simply isn't lighting up, try connecting an external display (via DisplayPort, HDMI, VGA, etc.) to see if the laptop properly outputs to that. Could help you narrow it down further.

 

[pillar]

Hey blank, so yes I do see the led lights through the keyboard, but its the screen that doesn't show anything. I can definitely try to use an external display to see if itll see anything. Normally, according to another video, it won't show anything, but still willing to give that a try. I've also heard where it could be the battery itself not having enough charge. I do have a multimeter, so I will give that a try later on today.

 

[Luna]

Not sure if this still applies, but when I worked on laptops in the past, Lenovo legions were notorious for failing to POST if the SSD died, you wouldn't even get to bios unless you took it out. You can maybe try that, see if it at least gets to BIOS without the drive, then at most you just need a replacement drive and a usb to use to install an OS again.

 

[blank_dvth]

I can definitely try to use an external display to see if itll see anything. Normally, according to another video, it won't show anything, but still willing to give that a try.

Motive behind the test was to differentiate behind a display failure vs. something going on with the computer itself (e.g. failing to POST in a scenario like that which Luna mentioned).

 

[pillar]

So it looks like im failing to POST because despite cleaning the vents and applying fresh thermal paste, the fans are still just running for 2 seconds and then turning off.

 

[pillar]

Hey all, so here's an update on my end. So I've tried to reseat the ram as well as the ssd's, no dice. I've even removed the ssd's and same result. The only thing I can think of now is to test the battery, but I've done some research and can't seem to figure out what's the best way to test it. I have a multimeter, but I'm not seeing any videos on how to test such batteries.

The only things I can think of now is that its either the battery itself or something on the motherboard.
EDIT so I just finished testing the CMOS by removing it and the battery while holding the power button for 60 secs. I'm thinking the CMOS is dead, so gonna order a new one. Hopefully this will fix my issue.

 

[pillar]

Hey all, latest update: so I found this small business in the nearest big city to me and decided to take both my cmos battery as well as my li-on battery to them to get some ideas. They were kind enough to test both the cmos as well as the li-on battery. Both tested in great condition voltage wise. In case anyone is wondering, I didn't know how to test either since there's no videos online on how to test them. So the guy at the shop suggested that I start looking at the chips on the motherboard as he thinks that one of them is gone and needs to be replaced. He said something about a PMC chip, which I'll look into.

I currently don't have any soldering equipment, but I've been considering getting some in order to do this kind of work, so it's definitely good timing that this happened. However, now I'll have to wait at least a week for the items to be shipped here since there's no places that sell the equipment to my knowledge. Then again, all the equipment is typically more affordable online to begin with.