Note on Finding Diagrams: Since
For the Nokia 105 (RM-908), "keypad ways" refers to the hardware trace paths and repair solutions for non-functional keys. Technical troubleshooting for this model typically focuses on identifying broken tracks or faulty components that connect the keypad pads to the main CPU/Power IC. Hardware Repair & Jumper Solutions
Repairing the keypad usually involves tracing the connection between the inner (signal) and outer (ground/common) circles of each key pad.
Common Trace Failures: Keypad issues are often caused by corrosion or physical damage to the delicate copper tracks on the PCB. If a specific row or column of keys fails, it indicates a break in a shared supply line.
Jumper Technique: Technicians use a multimeter (set to "Buzzer" or "Continuity" mode) to test for Ground Resistance (GR) on the center points of the keys. If a point shows no reading, a thin copper "jumper" wire can be soldered from the non-working pad to a corresponding component or test point that still has a valid signal.
Series Resistors: The keypad lines often pass through small series resistors. If a line is dead on one side of a resistor but live on the other, the resistor can be bypassed (shorted) to restore the connection.
Power Key: The "On/Off" key has its own dedicated track leading directly to the power section of the IC. If the phone won't turn on but the battery is good, a jumper from the power key's middle point to its specific test point is often required. Keypad Software & Codes nokia 105 rm 908 keypad ways
If the hardware is intact but the phone is unresponsive or locked, specific keypad codes are used for maintenance:
Security Lock: The default factory security code for the Nokia 105 is 12345.
Hard Reset: To erase all data and restore factory settings, enter *#7370# on the home screen.
Soft Reset: To restore settings without losing personal data, use *#7780#. General Keypad Usage For standard operation of the RM-908 keypad: Nokia 105 user guide: Keys and parts - HMD
Note: You can set the phone to ask for a security code to protect your privacy and personal data. The pre-set code is 12345. Nokia 105 User Guide: Keypad - HMD
For repairing the Nokia 105 RM-908 keypad , common issues often involve specific keys failing due to broken circuit tracks or water damage. Technical solutions typically involve jumper wires to bypass damaged sections of the motherboard Common Keypad Jumper Solutions Note on Finding Diagrams: Since For the Nokia
Repair guides often focus on grouping non-working keys to identify the broken "way" or track: Power Button Issues
: If the phone won't turn on, you may need a jumper from the power key contact point to a specific capacitor on the board. Specific Key Failures
**Keys 1, 4, 7, ***: Often share a common track that may require a jumper if the entire column fails. Keys 2, 5, 8, 0
: These keys are typically linked on a separate vertical way. Keys 3, 6, 9, # : Another common group for circuit failures. Keypad Backlight
: If keys work but don't light up, the issue is usually related to the keypad light IC or specific LEDs that need a jumper solution. Repair Visuals & Resources
For precise jumper placement, referring to a hardware schematic or visual diagram is essential to avoid short-circuiting the board. On the RM-908 board, the component responsible for
On the RM-908 board, the component responsible for scanning the keypad is typically a small CPU/IO expander or directly the main CPU. For keypad issues, we focus on the matrix lines at the CPU or a dedicated Keypad IC (often labeled U400 or similar near the keypad ribbon connector).
Before jumping wires, dismantle the phone:
In repair terminology, “keypad ways” means the electrical pathways connecting each keypad button to the main processor or keypad IC. These include:
For Nokia 105 RM-908, the keypad uses a matrix scanning method (typically 5 rows × 4 columns for a standard 12-button + navigation keys layout).
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).
If the connector strip (the plug that connects the main board to the keypad board) is loose or the pins are broken, you must jumper directly from the connector pins to the test points.