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## Initial Problem Description
The device arrived with the numeric keys on the internal keyboard non‐functional, despite a complete keyboard replacement. Visible moisture and sulfation were detected near the keyboard’s SPI controller (U4801).


820-3662 NO NUMERIC KEYS/CAPS LOCK INVERTED/INPUT DELAY - TOUCHPAD ISSUES
820-3662 NO NUMERIC KEYS/CAPS LOCK INVERTED/INPUT DELAY - TOUCHPAD ISSUES

Revision as of 23:45, 2 August 2025

820-3662 NO NUMERIC KEYS/CAPS LOCK INVERTED/INPUT DELAY - TOUCHPAD ISSUES

The device arrived with the numeric keys on the internal keyboard non‐functional, despite a complete keyboard replacement. Visible moisture and sulfation were detected near the keyboard’s SPI controller (U4801).

Solution

Diagnostic Steps

Repair Steps