This solution may help fix and repair Nokia 2710 No LCD Screen Display Backlight LED problem that result to a dark screen display on the LCD.
If this problem happens you may then first try to install a new replacement LCD screen to ensure that the LCD LED's caused the problem or not. if the Back light LED's still does not work, you may then proceed to hardware troubleshooting and used this solution below.
Solution for Nokia 2710 LCD screen display
backlight LED not working
You may start to trace the LED's positive ansd negative line paths from the LCD pin connector down to the components where it is being connected.
Check the LED driver IC supply voltage, this voltage has a rating value of 3.7 volts which feeds from the phones battery.
If all of the line paths and supply voltages were both fine, you may then proceed to replace the LED driver IC.
Note: a damaged LED driver IC on nokia 2710 will also result to keypad backlight failure. Therefore if the keypad backlight is working and only the LCD display backlight does not work, this doesn't mean that the LED driver chip is faulty or damaged. This indicates the LED driver IC is still working and fine.