The Lenovo ThinkPad T450s is an Ultrabook featured for business, and was released in February of 2015, with the model number:PC0530HJ. It has a powerful processor, high-resolution display, and a great battery life for it’s light weight.

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Laptop will not power on after repair

Long story short I replaced a trackpad for one of our employees, and now the laptop won’t stay on. When I go to turn it on, it will turn on for a few seconds with fans running and everything, the screen will flicker for a brief second then will shut off. Here is the list of steps I already tried. I tried reseating all components. I cleaned the fans. I reseated the processor (yes with new TP). I tested with new CMOS. I changed the battery. I tried without a battery while being plugged in. The only thing that I could possibly think it would be is a short on the motherboard. I do not want to buy a kit for testing and fixing this unless I am at least 90% sure that is the issue. Every other site I post on just tells me to troubleshoot the battery and charging port, but honestly I do not think that is what this is. Thank you I fixit. PS I love the kit I just bought :)

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This is indeed a tough one. It's obviously not even executing much or even any of the UEFI. You don't mention the RAM, but I'm sure you've tried swapping that.

You say you tested with new CMOS. Did you unsolder the CMOS chip and replace it, or just replace the battery? If the former you might have disturbed soething else. And of course, you connected the CMOS battery the right way round!

My best guess is that it might need the motherboard re-flowing. But any attempt to re-flow it without a propper re-flow oven is very much kill or cure, and a cure may not last. Lead-free solder is more brittle and less reliable than leaded and in disturbing the motherboard a older joint on a BGA device has fractured. Lead-free older can also grow whiskers which can cause shorts.

You say you're in an organisation which I presume has a number of these T450's. The acid test would be to swap the motherboard with another, perhaps one with a different fault, like a cracked screen. Or maybe you could pick up one cheaply on eBay listed as spares or repair, which appeared to have a good motherboard.

You say you replaced the trackpad. Are you sure the employee was telling you the whole story? Perhaps he spilled coffee on it and cleaned it up pretty well but nevertheless, the trackpad died. And now the motherboard has gone the same way. Any residue on it?


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Very Good answer. I did not unsolder the chip. I just replaced the battery. I have tried replacing the RAM as well. I think I will let it sit until I get another motherboard in to try that. It is very old anyway and due for replacement. I just wanted to fix it for the personal experience. Thank you and others for taking the time to help me. I really appreciate it. I am new to this site but I love it already.



Since this is the only thing you changed (right?) have you tried disconnecting the new Trackpad? I mean if it worked before what else has changed? I'm assuming you were very careful when you first did the replacement?

Troubleshooting Golden Rule - Keep it simple.


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I tried replacing with the original trackpad and still no luck. We did have a screw that was stripped on the motherboard and had to drill it out. We were extremely careful and no visible damage was done to the motherboard but I am starting to think it didn't like it too much. My coworker told me to give up and trash it because it is old anyway I just wanted to try.



Hi Ryan,

When you drilled out the screw did you vacuum or blow with canned air. Any Metal filing could cause a short. And when you said "stripped" did you mean the head or thread of the screw.

Did you try another power supply/charger? Try disconnecting everything such as battery, HDD, Wi-Fi card, screen (connect an external monitor), touchpad, etc. The idea is to isolate the source. All you need to do is to get into the BIOS.

Service manual:

Pg. 27 note 4. ...emergency reset hole...

Pg. 38 Numeric error codes.

Pg. 40 Beep symptoms


Just passing on years of experience. In over 35 years of servicing computers I've had one CPU and two motherboards die in that time so naturally I think of these two causes lastly in any troubleshooting. Incorrectly or partially inserted ribbon cables, RAM bad or not seated fully, etc. are more likely.

Good luck and have fun!




Ryan Lahr crwdns2893898:0crwdne2893898:0

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