Nokia E5 keypad illumination LED Backlight problem solution

This solution can help determine the Nokia E5 with no keyboard backlight LED lighting problem that results is too dark or black screen is displayed on the LCD screen. The repair guide provides an overview of the reconciliation of lightpaths keyboard backlight white LEDs and certain components to be checked or replaced if damaged.


Just refer to the solution and analyze how the keypad backlight circuit currents at the Nokia E5 board. Then follow some step by step procedures such as the way how the problem.
Troubleshooting tips do not work for Nokia E5 keypad LED backlighting problem:
1. Check some LED’s that will not light up with a multimeter. The white LED light are parallel. Replace if found corrupt.
2. Trace any particular connector trails for any cut or open circuit.
3. Check VBAT 3.7 V (battery voltage) over the choke.
4. Check / replace the choke.
5. Check / replace diode.
6. The LEDs negative supply voltage is fed from the IC gazoo.