What do you currently have available (e.g., soldering iron, multimeter)? Share public link
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If cleaning didn't help, you likely have a broken trace on the motherboard. nokia 105 rm 908 keypad ways
If all tracks show no resistance, the CPU (which handles keypad input) may need "reballing" or a gentle reflow with a heat gun. 5. Software Fix: Factory Reset
If there is no track reading on either side of the components, the internal solder joint under the main processor chip has broken due to physical drop damage. What do you currently have available (e
When specific buttons or entire rows/columns of keys stop responding, the issue is almost always a break in the internal trace lines (keypad ways) connecting the keypad matrix to the CPU/Power IC.
The Nokia 105 RM-908 PCB is thin. Excessive heat from a soldering iron can easily lift the gold keypad pads permanently. Set your soldering iron temperature between 320∘C320 raised to the composed with power C 350∘C350 raised to the composed with power C The Nokia 105 RM-908 PCB is thin
Disclaimer: This report is for educational and technical service purposes only. Mobile phone repair involves risks of damage. Always consult the official schematic diagram for the specific PCB version you are repairing.
These keys share a horizontal positive track. If Key 4 and 5 work but 6 is dead, jumper the inner point of Key 5 to the inner point of Key 6. 4. Special Characters (*, 0, #)
When the phone asks for a security gate, the ancient pre-set code is almost always 12345 .
Keep your soldering iron temperature around 330°C - 350°C . Touch the point for no more than 1–2 seconds to prevent lifting the fragile pad off the circuit board. 6. Software Validation and Factory Hard Reset