Nokia 105 Rm 908 Keypad Ways

Technical Service Report: Nokia 105 (RM-908) Keypad Ways & Troubleshooting

Device: Nokia 105 Model Code: RM-908 (Single SIM) Type: Feature Phone / Dumb Phone Issue Focus: Keypad Malfunction (Non-working keys, ghost touches, or complete keypad failure) Component Analyzed: Carbon contact keypad matrix and PCB (Printed Circuit Board) traces ("Ways")

9. Testing after repair

  1. Reassemble partially; connect battery.
  2. Use multimeter to verify continuity per matrix mapping when keys pressed.
  3. Boot phone and confirm all keys respond correctly.
  4. Run a keypad stress test: press each key multiple times and hold for long presses to check stability.

Before performing hardware repairs, try these simpler solutions: nokia 105 rm 908 keypad ways

Missing Lines: If a whole row or column of keys fails (e.g., 1, 2, 3), it means a single "track" shared by those keys has been cut. Technical Service Report: Nokia 105 (RM-908) Keypad Ways

Tools Required for Repairing Nokia 105 RM-908 Keypad Ways

  • Fine tip soldering iron (25W-30W)
  • Microscope or magnifying lamp
  • Multimeter (continuity mode with buzzer)
  • Jumper wire (0.1mm enameled copper wire)
  • Fiberglass pencil or soft brush for cleaning
  • Solder flux and leaded solder
  • Schematic diagram (printed or digital)
  • Isopropyl alcohol (99%)

Scenario C: "Center Joypad (OK/Select)" Dead

  • Cause: Mechanical stress from pressing hard.
  • The Way: The OK button is usually on R1 + C4. Check the continuity between the OK button pad and the IC. If open, run a direct wire from the inner circle of the OK pad (the center dot) to the corresponding IC pin (often Pin 7).

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