Apply a small amount of high-quality soldering flux to the target terminals.
Use a sharp hobby knife to gently scrape away the green solder mask covering a functional section of the trace line adjacent to the broken pad. nokia 105 rm 908 keypad ways
When you press a key, the metallic dome sheet temporarily shorts the inner and outer connections together, sending a unique signal to the main processor. Apply a small amount of high-quality soldering flux
Nokia 105 Model Code: RM-908 (Single SIM) Type: Feature Phone / Dumb Phone Issue Focus: Keypad Malfunction (Non-working keys, ghost touches, or complete keypad failure) Component Analyzed: Carbon contact keypad matrix and PCB (Printed Circuit Board) traces ("Ways") Nokia 105 Model Code: RM-908 (Single SIM) Type:
Before concluding that a keypad malfunction is entirely caused by a hardware failure, rule out a frozen operating system or deep software glitch. How to Hard Reset the Nokia 105 RM-908
: Use a multimeter set to the "buzzer" or diode range to check for continuity along the keypad lines. Jumper Solutions :
To trace continuity, set your digital multimeter to . Place one probe on the non-working key pad and trace backwards along its connection group to locate the break point. Target Key Failures Interconnection Path (Shared Line Way) Likely Action Required Call Key, 1, 4, 7 Shared Outer Ring Trace