When a track line under the board layers is destroyed, a micro-jumper bypasses the broken internal line using insulated copper wire.
The Menu, Options, and Arrow keys share a common trace with upper numbers like 1 or 3 . If the Menu key is completely unresponsive: nokia 105 rm 908 keypad ways
The keypad on the Nokia 105 RM-908 operates on a matrix system consisting of and outer rings (ground/negative lines) . When you press a button, it connects the inner circle to the outer ring, completing the circuit. When a track line under the board layers
Repair Application: If keys 1 , 2 , and 3 fail together but the Call Key works, scrape the trace line coming out of the Call Key and solder a jumper wire directly to the inner pad of key 1 . The Vertical Ring Tracks (Outer Rings) Left Selection ↔left-right arrow Call Key ↔left-right arrow 1 ↔left-right arrow 4 ↔left-right arrow 7 ↔left-right arrow * Column 2: Up Navigation ↔left-right arrow Down Navigation ↔left-right arrow 2 ↔left-right arrow 5 ↔left-right arrow 8 ↔left-right arrow 0 Column 3: Right Selection ↔left-right arrow End/Power Key ↔left-right arrow 3 ↔left-right arrow 6 ↔left-right arrow 9 ↔left-right arrow # When you press a button, it connects the
: If keys like 1, 2, and 3 fail simultaneously, there is a break in the common supply line for that row.