Nokia 105 Rm 908 Keypad Ways Site

This is the definitive test to determine if the fault is in the tracks or the CPU. Take a pair of tweezers or a jumper wire. Short the two contact points of a non-working key directly on the PCB.

No. RM-908 has a specific PCB layout. Keypad ways differ between RM-908, RM-1134, and other variants. Always use model-specific diagrams.

The Nokia 105 RM-908 is a legend in the world of feature phones. Renowned for its durability, battery life, and simplicity, it has been a staple in the mobile market for years. However, like all frequently used devices, it is prone to wear and tear. One of the most common issues faced by users—and consequently, one of the most frequent repairs performed by technicians—is keypad failure. Nokia 105 Rm 908 Keypad Ways

Control rows of keys. Typical Column Lines (C1-C3): Control columns of keys.

Often, a simple cleaning resolves the issue. Use a toothbrush dipped in PCB cleaner or isopropyl alcohol. Gently scrub the contact points and the surrounding tracks. Dry the board thoroughly and test. This is the definitive test to determine if

: Multiple keys (e.g., 1, 4, 7, *) failing together usually indicates a broken track on the PCB.

For the Nokia 105 RM-908, the keypad is organized in a (rows and columns). Each key press completes a circuit between a specific row and column. These pathways are printed on the main PCB (Printed Circuit Board) and connect to the processor via dedicated pins. Always use model-specific diagrams

If jumpers between keys do not solve the problem, the track is broken between the keypad matrix and the CPU. You must consult the schematic to find the specific pin on the CPU that corresponds to that row or column.

: If a resistor is faulty, it can often be bridged (shorted) to restore the connection if GR is present on only one side.

: The device is strictly for basic communication; it does not support apps like WhatsApp or have a camera (though the similar Nokia 110 does). Maintenance & Troubleshooting