Acer Aspire A515-51G笔记本power button失效、battery discharge pinhole button可启动的故障排查咨询

Hey there, let's dig into this weird issue with your Acer Aspire A515-51G. Since the pinhole discharge button can start the laptop but the main power button can't, and you've already ruled out driver issues, your hunch about a hardware problem related to the power supply/button module is totally on point. Here's a breakdown of likely causes and actionable troubleshooting steps:

Likely Root Causes #

• Power button hardware failure: The main power button's internal contacts might be worn out, stuck, or damaged. The pinhole button bypasses this module entirely and triggers the motherboard's direct boot signal, so this is the most probable culprit.
• Loose or damaged power button ribbon cable: Over time, opening/closing the laptop or accidental bumps can loosen the thin ribbon cable that connects the power button assembly to the motherboard. Oxidation at the cable's connector could also block the signal from reaching the motherboard.
• Minor motherboard circuit issue (specific to power button input): While the core boot circuit works (thanks to the pinhole button), a tiny component like a capacitor or micro-switch on the motherboard's power button input path might be faulty.

Troubleshooting Steps You Can Try #

• Quick external checks first:
  • If your laptop is still under warranty, skip the DIY steps and contact Acer support immediately to avoid voiding coverage.
  • Use compressed air or a soft brush to clean any dust/debris stuck in the power button's gaps—sometimes gunk can prevent the button from making proper contact.
  • Gently press around the power button's surrounding casing to see if slight pressure fixes the issue (a warped casing might be pressing on the button's internal mechanism incorrectly).
• Check the ribbon cable (for DIY-savvy users):
  • Shut down the laptop, unplug the power adapter, and remove the battery (if it's removable; some A515-51G models have built-in batteries that require screwing off the back panel).
  • Locate the thin ribbon cable connecting the power button assembly to the motherboard. Carefully unplug it, inspect for fraying or damage, then re-seat it firmly. Reassemble and test the power button.
• Test the power button's functionality:
  • If you have a multimeter, set it to continuity mode. Press the power button—you should see a continuity signal when pressed, and no signal when released. If there's no change, the button itself is dead and needs replacement.
• Reset BIOS to default:
  • Restart the laptop and press F2 to enter BIOS. Look for an option like Restore Defaults or Load Setup Defaults, confirm the reset, save changes, and exit. While unlikely, a misconfigured BIOS could interfere with the power button signal processing.

If none of these steps fix the issue, it's time to take it to a professional repair shop—they can replace the power button module or diagnose any subtle motherboard issues safely.

备注：内容来源于stack exchange，提问作者Yanjan. Kaf.