The outer rings of the Menu, Left, and Up keys are linked. The outer rings of the Call, Right, and Down keys form another group.
If a single key fails, the issue is usually a dirty carbon dome. If a whole row or column of keys fails simultaneously, a shared trace on the motherboard is broken. Shared Keypad Lines (Common Groupings) 1, 2, 3 Line 2: 4, 5, 6 Line 3: 7, 8, 9 Line 4: *, 0, #
For software-related keypad issues or standard usage, these codes and settings are essential: Nokia 105 (2023) User Guide - HMD
Remove the battery for a few seconds to clear temporary software glitches that might make buttons seem unresponsive. nokia 105 rm 908 keypad ways
Touch the red probe to the inner core and outer ring of the problematic keys to check their value. Analysis:
Usually, the inner pad's trace to the next key is broken. 3. Step-by-Step Diagnostic & Repair Procedure Tools Required Multimeter (set to continuity/ohm mode). Soldering Iron (fine tip). Jumper Wire (thin insulated wire). Step 1: Clean the Keypad Area
If a specific key (e.g., the number 5) isn't working, check for continuity between its pad and the pads of nearby keys. If they share a "way" but the connection is open, you have a broken track. The outer rings of the Menu, Left, and Up keys are linked
: The power button (On/Off) has a dedicated track. If the phone won't turn on but the battery is fine, a jumper can be taken from the power key's center point to the positive terminal of the power section. Resistor Bridging
Before performing hardware repairs, try these simpler solutions:
When a track is broken ( OL ), you must run a micro-jumper wire from a functioning button or component along the same trace line to the broken button. Use the mapping below to find corresponding pins. The Horizontal Core Tracks (Inner Circles) Call Key ↔left-right arrow 1 ↔left-right arrow 2 ↔left-right arrow 3 Line 2: Left Selection ↔left-right arrow 4 ↔left-right arrow 5 ↔left-right arrow 6 Line 3: Right Selection ↔left-right arrow 7 ↔left-right arrow 8 ↔left-right arrow 9 Line 4: End/Power Key ↔left-right arrow * ↔left-right arrow 0 ↔left-right arrow # If a whole row or column of keys
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for a specific set of keys that aren't working on your device?
When prompted for a security code, input the default Nokia master code: .
Connect the outer rings of the affected column together using jumper wire. Zero key response Main CPU/IC solder joints cracked Reflow or re-ball the central processor chip. ✅ Repair Verification