Here's the Nokia 1680 and 1681 classic solution for Not working Keypad Light LED. This solution shows the connection line tracks of the phone's keypad light circuit.
To fix this problem, you may first check the two LED's for possible damaged,. Then trace its connection using the solution below.
The LED driver if faulty will caused the two LED's shut down and unable to light up. You may first check the 3.8V battery voltage across the filter coil, check the filter coil as well. If the supply voltage reading is okay, replace the LED driver chip.
Note: the LED driver chip also holds the LCD display light, so if the LCD light is okay the LED driver were also means okay.
To fix this problem, you may first check the two LED's for possible damaged,. Then trace its connection using the solution below.
Nokia 1680c, 1681c Keypad Light Connection Ways
Note: the LED driver chip also holds the LCD display light, so if the LCD light is okay the LED driver were also means okay.
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