Rm 908 Keypad Ways =link= — Nokia 105

Key | Row pad | Column pad 1 | R1 | C1 2 | R1 | C2 3 | R1 | C3 4 | R2 | C1 5 | R2 | C2 6 | R2 | C3 7 | R3 | C1 8 | R3 | C2 9 | R3 | C3

After applying the jumper wires, insert the battery to verify the repair. Use the secret master test command code *#7370# on the home screen to perform a factory reset. This rules out any lingering software lockups, confirming that every key in the matrix registers input correctly.

Use your multimeter to find where the voltage signal cuts off along the trace line.

Before diving into troubleshooting, it helps to have a basic understanding of how the keypad system works. For the Nokia 105 (2013), the keypad function is straightforward. The phone is a classic with rubberized keys which are slightly raised to help you distinguish them under your thumb. It does not have a touchscreen, so the physical keypad is your primary interface for everything from dialing numbers and typing messages to navigating menus using the central five-way D-pad. nokia 105 rm 908 keypad ways

A structured approach—visual inspection, matrix mapping, targeted cleaning, and trace repair—resolves most Nokia 105 RM-908 keypad faults. Keeping documentation of the keypad matrix for the specific unit simplifies diagnosis and repair.

Note: For instance, if keys fail simultaneously while the rest function normally, tracing the resistor lines on the board usually reveals an open circuit directly leading back toward the CPU. Step-by-Step Diagnostic and Repair Process

Understanding the matrix helps you quickly diagnose which row or column has failed. Below is the standard mapping for the : Key | Row pad | Column pad 1

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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 # Use your multimeter to find where the voltage

: If tracks are intact but the keypad still fails, the main control IC may need to be re-soldered or "reballed". Keypad Codes & Settings

This article provides a comprehensive guide to understanding and repairing the using jumper techniques. Understanding Keypad Problems

Ensure the jumper wire does not touch any other components or tracks.