iFixit - Answers With Device "Acer Chromebook"

acer chromebook 14: Acer Chromebook 14 CB3-431 voltage drop and no power with battery disconnected

Sat, 22 Aug 2026 08:17:23 -0700

I am troubleshooting an Acer Chromebook 14 CB3-431 that will not boot and has no charging lights. The battery is disconnected. The power supply outputs 19.7V, but when plugged in, the voltage drops to 18.2V at the motherboard input socket (4-pin: 2 red, 2 black). Different pin combinations yield slightly different voltages, but the voltage is sagging and nothing turns on. Has anyone encountered this specific voltage sag or a common shorted component on the CB3-431 motherboard input circuit?

⟐ Edited August 22, 2026 at 8:17 MST

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⟐ Commented April 15, 2026 at 17:54 MST

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