Check the situation carefully. If the laptop is damaged, consider whether it might be fixed.
Check the situation carefully. If the laptop is damaged, consider whether it might be fixed.
I attempted a simple fix and mistakenly connected a passive PoE Ethernet cable to my laptop's port. The device stopped working instantly once the passive PoE was attached, and neither the power switch nor the charging indicator lit up. It seems the port is likely damaged. I’m unsure what caused it, but I’ve checked RAM compatibility and other components, and everything checks out except the port itself. Since it’s a laptop with soldered CPU, I’m not sure if replacing the board would help. The charging LED on the side isn’t responding, which makes me think there might be a deeper issue in the motherboard or power circuit. I’ve inspected all exposed parts, but no obvious damage was found. Given the age of the machine (over a year past warranty) and the lack of visible faults, it might be worth trying a replacement motherboard or checking for hidden damage under the heat pipes. If you have access to more advanced tools, a multimeter could help identify electrical faults.
It seems like the device is likely nonfunctional, but you might try removing both the main battery and the CMOS battery for roughly ten minutes if it’s just a faulty component. This approach has the advantage of resetting the BIOS to its default settings. Adding an external screen could also be useful. Right now, the priority is simply getting it to turn on.
However, there are also those who don’t want to pay Cisco licensing fees for newer POE standards. They develop their own solutions tailored to specific vendors and differentiate from other devices. This trend was common in the early days when all standards were vendor-specific. Now, with switches powered off from other switches using POE, it’s important to stay aware.
I could have warned you not to buy a gigabyte laptop a few years back right after the warranty ended. Really poor control software and even with the laptop-level 3070 turned off and in its most power-saving setting, it only lasts about 2.5 hours on battery. Plus, it never managed to set up a 2.5Gbps connection on the 2.5GbE port—most just left it at 1Gbps. Looking at other posts I've seen online, people who made this mistake kept their devices running instead of shutting them down.
The passive PoE came from a Tripp Lite HMDI over CAT6 extender. I mistakenly picked the wrong cable and only realized the error late. They claim it's a PoC, but based on the sparse documentation I have, it seems to be just 24V Passive PoE.
suggests there might be an issue hidden underneath. diagnosing it will be extremely tough if the 24v connects to what you think is a 3.3v power rail for the Ethernet controller—everything there should be fine. if the laptop won’t charge, show any signs, or doesn’t respond at all, it points to a blown ECU. If you’re okay with it, take it apart and inspect the motherboard closely. You’ll likely spot several small holes or craters in the bigger components. Another approach is removing the battery and attempting to power it on without it, using the charger instead. Also verify that the battery had a charge when damaged, which seems likely.
Without a diagram of the motherboard, the process will require a lot of testing and searching for component references. It can be managed, though it will involve desoldering and re-soldering a chip or SMD onto the board. There aren’t many clear images showing the motherboard with components removed, especially coolers.
It's likely they'd also get damaged if the entire rail was affected.