Nokia 105 Rm 908 Keypad Ways ((top)) Guide

: These keys share a horizontal path. If the trace from the CPU is cut off before reaching this row, jumper the row line directly back to its nearest matching test point on the motherboard.

If the hardware is intact but the keys are behaving erratically, type *#7370# on the home screen (default security code is 12345 ) to restore original settings.

If the left column (1, 4, 7, *) is not working, the track responsible for this column is broken.

Place the black probe on a ground spot (e.g., metal shielding).

The keypad functions through a matrix of tracks (lines) that connect to the main CPU/Power IC. When specific keys fail, it is usually due to a broken track or "way" that needs a jumper to restore the connection. Hardware Troubleshooting (Keypad Ways) nokia 105 rm 908 keypad ways

Follow these steps to apply micro-jumpers directly to the motherboard tracks.

Before performing hardware adjustments or applying heat to the motherboard, systematically isolate the root cause.

If you're experiencing issues with your Nokia 105 (RM-908) keypad, here are some troubleshooting tips:

If specific keys are not responding, the internal track or a series resistor on the PCB is likely damaged. : These keys share a horizontal path

The Nokia 105 (model number ) is a legendary feature phone, renowned for its exceptional battery life, rugged build, and simplistic design. Despite its durability, one of the most common issues technicians face after years of use or liquid damage is keypad failure —specific buttons not working, ghost touches, or a completely dead keypad.

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.

Happy repairing!

Disassemble the phone case and peel back the white adhesive keypad dome sheet. If the left column (1, 4, 7, *)

If the hardware is intact but the phone is unresponsive or locked, specific keypad codes are used for maintenance:

According to specialized repair guides 1.2.2 , a jumper can be taken from a component near the microphone area to the broken pad point to restore function. 5. Specific Row "Start-Zero-Hash" (*)

Mastering the is a fundamental skill for any mobile hardware technician. Unlike modern complex circuits, this phone’s matrix is straightforward and forgiving. By understanding the Row/Column mapping, using a multimeter to trace continuity, and skillfully applying jumper wires, you can revive phones that others have thrown into the “parts-only” bin.

The Nokia 105 RM-908 is an iconic feature phone celebrated for its exceptional durability and impressive battery life. However, like any electronic device, it can succumb to hardware failures, with a non‑responsive keypad being one of the most prevalent issues. This comprehensive guide is crafted for repair technicians, electronics hobbyists, and users who want to restore their Nokia 105 RM‑908 to full functionality. Inside, you will find the precise technical “keypad ways”—the conductive paths from the CPU to the keypad contacts—as well as proven jumper solutions, component‑level diagnostics, and practical, step‑by‑step repair strategies.

Inspect the gold-plated circles on the PCB for green oxidation or dark carbon buildup.