Nokia 105 Rm 908 Keypad Ways Here

Technicians should use a multimeter in continuity mode to trace connections. If a track is broken, use insulated jumper wire (0.10mm) to bridge the gap.

| Key | Connection Point A | Connection Point B | | :--- | :--- | :--- | | Call (Green) | Row 1 | Col 1 | | End (Red) | Row 5 | Col 1 | | D-Pad Up | Row 1 | Col 2 | | D-Pad Down | Row 2 | Col 2 | | D-Pad Left | Row 3 | Col 2 | | D-Pad Right | Row 4 | Col 2 | | D-Pad Center | Row 5 | Col 2 | | Soft Keys (L/R) | Row 1/2 | Col 3 | | Digit 1 | Row 1 | Col 4 | | Digit 2 | Row 1 | Col 5 | | Digit 3 | Row 1 | Col 6 | | Digit 4 | Row 2 | Col 4 | | ... | ... | ... |

(Note: Exact column/row assignments may vary slightly by PCB revision; always verify with a schematic diagram if available). nokia 105 rm 908 keypad ways

The Nokia 105 (RM-908) is a classic feature phone (2013 release) known for its durability, long battery life, and simplicity. Its keypad is not a standalone module but is integrated into the main PCB via carbon contact pads and a flexible membrane. The keypad ways refer to the conductive traces, test points, and column/row matrix lines that connect the keypad buttons to the baseband processor (typically a Mediatek or Spreadtrum chipset, often a MT6250 or similar).

Understanding the keypad matrix is essential for diagnosing: Technicians should use a multimeter in continuity mode

If the Keypad Filter IC is unavailable, "Direct Jumpers" to the CPU/PDSA can be performed, though this requires advanced soldering skills and a detailed schematic. The most common failure points are the filter capacitors near the keypad interface; removing these capacitors and checking if functionality returns is a common diagnostic step.

| Fault Source | Prevention Method | |--------------|-------------------| | Liquid damage | Apply transparent conformal coating around the keypad connector after repair. | | Broken connector pins | Reinforce connector with a drop of epoxy (avoid pins). | | Cracked PCB near chassis screws | Do not overtighten screws; use plastic washers. | | Carbon debris shorting ways | Clean keypad dome sheet regularly with isopropyl alcohol. | If the Keypad Filter IC is unavailable, "Direct

  • Fix: Reball CPU, repair flex, or replace.

    • Before diving into jumper solutions, you must understand the hardware. The Nokia 105 RM-908 is powered by a Mediatek (MTK) or similar baseband processor. Unlike modern smartphones, this phone uses a carbon pad keypad that presses onto a flexible PCB (Printed Circuit Board) or directly onto the main PCB contacts.

    The keypad consists of:

    Each button corresponds to a specific row and column intersection on the PCB.

    A: Yes. Use a multimeter in continuity mode while pressing keys. Probe from the keypad connector backward. For standard matrix, common ground is always present. Trace each line manually.