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Acer TravelMate 4720 - Battery Charges but No Power-Up

Was given an old TravelMate 4720-6220 circa 2007 that's in fairly nice condition but won't power up so just asking for ideas. When plugged in, the battery charges correctly - I watched it do a full charge and the light switch from orange to green when finished - but the power button gives no response at all, both on and off AC and with/without battery installed. That being said, when you plug it in initially, it briefly powers on by itself - green power light comes on, monitor lights up no video is displayed, then shuts off or goes into charge mode if the battery is connected. There are no beep codes during this and the power button does nothing. Things checked/tried:

* Removed RAM, wi-fi card
* Checked and re-connected all cables and drives
* Checked board for corrosion or obvious signs of failure
* New thermal paste - here I noted that there was a pretty heavy buildup of dust 'n' crud between the fan and heatsink radiator. I cleared all this out of course, but it was enough that I expect the original owner probably experienced some heat-related issues at some point. The original thermal paste, however, wasn't exceptionally cooked and looked basically like what you'd expect on a machine this age.
* Replaced CMOS battery
* The power button on this model is a physical button mounted on the motherboard itself, it appears undamaged.

Any ideas? I don't really care one way or the other about the thing, but if the symptoms sound familiar to anyone I might as well give it a shot. Thanks.

Posted by crap suck on

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Isma Ismal

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Based on the symptoms you described, it sounds like there could be an issue with the motherboard or power supply. Here are a few things you can try to narrow down the issue:

  1. Try a different power adapter. It's possible that the power adapter is not providing enough power or is malfunctioning.
  2. Check the power supply unit (PSU). The PSU is responsible for providing power to the motherboard and other components. If it is faulty, it could be causing the issue. You can try testing the PSU by using a multimeter to measure the voltage on the various connectors.
  3. Check the motherboard. If the PSU and power adapter are functioning correctly, the issue could be with the motherboard. You can try to boot the laptop with just the essential components (e.g., CPU, RAM, and PSU) connected to see if the issue persists. If the problem goes away, it could be a problem with one of the other components.
  4. Check the BIOS. If the laptop is able to power on, but there is no display, it could be an issue with the BIOS. You can try resetting the BIOS by removing the CMOS battery and unplugging the laptop, then pressing and holding the power button for 30 seconds to drain any residual power. Then, reinsert the CMOS battery, plug the laptop back in, and try turning it on again.
I hope these suggestions help! If you continue to have issues, you may want to consider seeking the help of a professional laptop repair service.

Posted on Dec 18, 2022

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