Here's the Nokia 6124c keypad light not working problem or the keypad LED's failed to light up and illuminate the keypad keys.
To fix the keypad light problem you may first check the keypad LED's using a multimeter just to confirm if the LED's is still working or not. Then replace it if the the said LED's is already damaged or faulty. Then check also the keypad flex matrix for possible open or cut-off in the LED's connection. If the LED's were still working and the flex matrix is OK, you may then do some check procedures on components that holds for the keypad LED circuit.
This solution provides some hints on how to fix the problem, you may refer to the solution below for further troubleshooting procedures.
From the keypad pin connector, trace the LED's positive and negative supply voltage line paths down to the components showed on the solution above. The negative (LED-) is connected to a three legged transistor while the positive (LED+) is on the six legged transistors, these transistors where both LED voltage drivers, and if damaged it will result to the keypad LED's failure to light-up. You may check also and try to replace these components including the 100 ohms resistors associated or connected to it.
The circuit is driven by a 3.7 volts battery voltage, you may read this voltage on the filter coil. If the said 3.7V voltage is cut-off or missing, it will result to both the display and the keypad back light LED's doesn't work. You may also see the Nokia 6124c display backlight repair solution here.
To fix the keypad light problem you may first check the keypad LED's using a multimeter just to confirm if the LED's is still working or not. Then replace it if the the said LED's is already damaged or faulty. Then check also the keypad flex matrix for possible open or cut-off in the LED's connection. If the LED's were still working and the flex matrix is OK, you may then do some check procedures on components that holds for the keypad LED circuit.
This solution provides some hints on how to fix the problem, you may refer to the solution below for further troubleshooting procedures.
Nokia 6124c Keypad Backlight Jumper Solution
The circuit is driven by a 3.7 volts battery voltage, you may read this voltage on the filter coil. If the said 3.7V voltage is cut-off or missing, it will result to both the display and the keypad back light LED's doesn't work. You may also see the Nokia 6124c display backlight repair solution here.
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