Nokia 105 Rm 908 Keypad Ways !full! <Trusted Source>

| Test Point Label | Signal | Location on PCB | |----------------|--------|------------------| | TP201 | COL0 | Near SIM holder | | TP202 | COL1 | Under keypad shield edge | | TP203 | COL2 | Adjacent to vibrator | | TP204 | COL3 | Near CPU pin 48 | | TP205 | ROW0 | Close to battery connector (-) | | TP206 | ROW1 | Below LCD connector | | TP207 | ROW2 | By microphone pads | | TP208 | ROW3 | Next to charging IC |

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 . Its keypad was silent—some keys were stubborn, while others refused to respond entirely.

When the multimeter reads OL , you must manually bridge the broken connection using insulated .

Bridge the inner contact of the Menu key over to the outer track of the closest functional navigation button. Number Matrix Failures (Rows & Columns)

| Pin No. | Signal Name | Goes To (Component) | Function | |---------|-------------|---------------------|-----------| | 1 | KBR0 (Column 0) | CPU (Row Sense) | Keys: 4, 5, 6, * | | 2 | KBR1 (Column 1) | CPU | Keys: 1, 2, 3, # | | 3 | KBR2 (Column 2) | CPU | Keys: Left, Up, Down, Right, Call | | 4 | KBR3 (Column 3) | CPU | Keys: End/Power, Cancel/Back | | 5 | KBT0 (Row 0) | CPU (Column Drive) | Keys: 1, 4, Left, End | | 6 | KBT1 (Row 1) | CPU | Keys: 2, 5, Up, Cancel | | 7 | KBT2 (Row 2) | CPU | Keys: 3, 6, Down | | 8 | KBT3 (Row 3) | CPU | Keys: *, #, Right, Power | | 9 | GND | Ground | Common ground | | 10 | GND | Ground | Common ground | | 11-16 | NC / LED+ | Not connected / Backlight | Keypad backlight anode | nokia 105 rm 908 keypad ways

Repairing Nokia 105 (RM-908) Keypad Issues: A Comprehensive Jumper Guide

To successfully execute these hardware modifications, ensure you have the following micro-soldering tools ready: To test continuity and trace broken lines Fine-Tip Soldering Iron For precise soldering on small copper pads ( tips recommended) 0.1mm Enameled Copper Wire To create the hardware jumper ways 99% Isopropyl Alcohol (IPA) To clean corrosion, carbon buildup, and old flux Mechanic/Amtech Soldering Flux Ensures smooth adhesion of jumper wire to the PCB Magnifying Glass / Microscope Essential for viewing the microscopic Nokia 105 traces Precautions During Repair

Solder one end of the wire to the source and the other to the non-functional button pad.

Switch your digital multimeter to . Place the black probe on a verified ground source (such as the SIM slot shield or battery negative terminal). Touch the red probe to the center pad and then the outer ring of the non-functioning key. | Test Point Label | Signal | Location

: Trace the vertical tracks down to the bottom edge of the board. Clean any corrosion away from the via holes, as moisture often pools at the bottom of the device and corrodes these specific links. Hardware Repair Tips for Technicians

Place the red probe on the inner pad of the broken key and trace it to the neighboring working key. Step 3: Performing Jumper Repairs

When a track is broken, technicians use a "jumper"—a small wire—to bypass the break and restore connectivity .

Enameled copper wire used to bridge broken motherboard traces. Its keypad was silent—some keys were stubborn, while

If the dial pad works but the keys act erratically, try executing a master reset: Type on the home screen.

Once the hardware was restored, Aris reminded the traveler of a few final "magic words" to ensure the software was just as healthy:

Take out the battery, SIM card, and charger to protect the motherboard components.