Nokia 105 Rm 908 Keypad Ways Direct

In the small town of Circuitville, there lived a legendary mobile technician named Aris. Known for breathing life back into old devices, Aris was often visited by people who refused to let go of their trusted companions. One rainy Tuesday, a traveler arrived with a Nokia 105 (RM-908). Its keypad was silent—some keys were stubborn, while others refused to respond entirely.

Power Key Problems: If the phone won't turn on, Aris looks at the power key ways. On the RM-908, the center point usually carries the main supply from the power section, while the outer ring is often ground.

Solution B: Jumper to CPU/Filter

Often, the trace breaks between the keypad contact and the protective filter. nokia 105 rm 908 keypad ways

If you're looking for a more in-depth understanding of the keypad's electrical connections and repair procedures, I recommend consulting the official service manual or a reputable mobile repair guide.

1. Understanding “Keypad Ways”

In repair terminology, “keypad ways” means the electrical pathways connecting each keypad button to the main processor or keypad IC. These include: In the small town of Circuitville, there lived

Often connected to a specific resistor near the Power IC. If the track is broken, jump directly from the resistor to the center pad. Menu, 1, 2, 3

  1. With battery removed, visually inspect elastomer and PCB.
  2. Re-seat keypad assembly and test with battery installed before further disassembly to confirm fault persists.
  3. Use multimeter in continuity mode:

    : Keys are often connected in groups (e.g., 1, 2, 3 or 4, 5, 6). If an entire row is dead, check the shared track for that specific group. Keypad Codes & Basic Functions With battery removed, visually inspect elastomer and PCB

    | Keypad Button | Row Line | Column Line | Common Failure Point | Suggested Jumper From -> To | | :--- | :--- | :--- | :--- | :--- | | 5 | R3 | C2 | Right edge of PCB near SIM slot | Button 5 contact -> C2 filter resistor | | 8 | R4 | C2 | Bottom left corner via | Button 8 pad -> R4 IC pin | | 0 | R5 | C2 | Water damage near microphone | R5 track -> CPU ball (Bottom left) | | Left Soft Key | R1 | C5 | Torn ribbon cable flex | Flex pin 3 -> Mainboard test point TP405 | | # (Hash) | R4 | C3 | Cracked solder under CPU | Direct CPU pin reball (Not recommended for beginners) |