Troubleshooting Guide: Nokia 105 RM-908 Go to product viewer dialog for this item. Keypad Ways and Jumper Solutions
Solder one end of the wire to the functioning key's line terminal, and the other end to the non-responsive pad. Ensure the wire lays completely flat so the dome matrix sticker sits evenly afterward. Troubleshooting Advanced Power Key Failures
: Set your multimeter to Continuity/Buzzer mode . Place one probe on the non-working key's center or outer ring and the other on its corresponding resistor or IC pin.
Usually connected to a row or column shared with other keys. nokia 105 rm 908 keypad ways
(Note: Actual pin numbers may vary slightly depending on board revision; always test continuity with a multimeter before jumping.)
If all rows/columns are open or shorted, suspect cracked BGA joints under CPU. Reball using 0.35mm stencil and leaded solder.
: Often caused by a break in the Red Power Key line. Troubleshooting Guide: Nokia 105 RM-908 Go to product
Place the second probe on the inner pin of an adjacent button that belongs to the same row or column.
If your keys work mechanically but inputs lag, act erratically, or type random strings of letters, a corrupted system platform might be the culprit. Perform a master factory reset to eliminate software bugs: Type *#7370# on the main dial screen.
Remember to start with the simplest solution (cleaning) and only progress to hardware‑level interventions if necessary. With patience and the right tools, you will soon have your Nokia 105 RM‑908 typing numbers and navigating menus like new. Troubleshooting Advanced Power Key Failures : Set your
Repairing Nokia 105 (RM-908) Keypad Issues: A Comprehensive Jumper Guide
: 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
: Check the continuity between the inner centers of these three buttons. If Key 2 is dead but 1 and 3 work, run a short jumper wire from the center of Key 1 directly to the center of Key 2.
The outer rings of *, 0, and # are interconnected. If this entire bottom row fails, find the main track heading upwards on the right side of the PCB, scrape the green solder mask, and jumper it back to the # key outer ring. Tools Required for the Repair
The Nokia 105 RM-908 does not use a traditional tactile switch matrix. Instead, it utilizes:
Troubleshooting Guide: Nokia 105 RM-908 Go to product viewer dialog for this item. Keypad Ways and Jumper Solutions
Solder one end of the wire to the functioning key's line terminal, and the other end to the non-responsive pad. Ensure the wire lays completely flat so the dome matrix sticker sits evenly afterward. Troubleshooting Advanced Power Key Failures
: Set your multimeter to Continuity/Buzzer mode . Place one probe on the non-working key's center or outer ring and the other on its corresponding resistor or IC pin.
Usually connected to a row or column shared with other keys.
(Note: Actual pin numbers may vary slightly depending on board revision; always test continuity with a multimeter before jumping.)
If all rows/columns are open or shorted, suspect cracked BGA joints under CPU. Reball using 0.35mm stencil and leaded solder.
: Often caused by a break in the Red Power Key line.
Place the second probe on the inner pin of an adjacent button that belongs to the same row or column.
If your keys work mechanically but inputs lag, act erratically, or type random strings of letters, a corrupted system platform might be the culprit. Perform a master factory reset to eliminate software bugs: Type *#7370# on the main dial screen.
Remember to start with the simplest solution (cleaning) and only progress to hardware‑level interventions if necessary. With patience and the right tools, you will soon have your Nokia 105 RM‑908 typing numbers and navigating menus like new.
Repairing Nokia 105 (RM-908) Keypad Issues: A Comprehensive Jumper Guide
: 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
: Check the continuity between the inner centers of these three buttons. If Key 2 is dead but 1 and 3 work, run a short jumper wire from the center of Key 1 directly to the center of Key 2.
The outer rings of *, 0, and # are interconnected. If this entire bottom row fails, find the main track heading upwards on the right side of the PCB, scrape the green solder mask, and jumper it back to the # key outer ring. Tools Required for the Repair
The Nokia 105 RM-908 does not use a traditional tactile switch matrix. Instead, it utilizes: