This solution may help fix the Nokia E5 with no keypad illumination backlight LED problem that result to dark or black screen displays on the LCD. The repair guide below shows the connection light paths of keypad backlight white LED's and certain components that needs to be check or replace if damaged.
Just refer to the solution and analyze how the keypad backlight circuit flows on Nokia E5 PCB board. Then follow some step by step procedures like the way how way troubleshoot the problem.
Troubleshooting hints for Nokia E5 not working keypad backlight LED problem:
1. Check a certain LED's that won't light up using a multimeter. The white LED bulb are connected in parallel. Replace if found damaged.
2. Trace each certain connection line paths for possible cut off or open circuit.
3. Check the 3.7v VBAT (battery voltage) across the inductor coil.
4. Check/replace the inductor coil.
5. Check/replace the diode.
6. The LED's negative supply voltage is feed from the GAZOO IC.
There is a possibilty if the GAZOO chip is faulty, it will result to keypad light problem.
Reworking it might only fix the problem or replace if necessary.
Just refer to the solution and analyze how the keypad backlight circuit flows on Nokia E5 PCB board. Then follow some step by step procedures like the way how way troubleshoot the problem.
Nokia E5 Keypad Light LED Jumper Ways
1. Check a certain LED's that won't light up using a multimeter. The white LED bulb are connected in parallel. Replace if found damaged.
2. Trace each certain connection line paths for possible cut off or open circuit.
3. Check the 3.7v VBAT (battery voltage) across the inductor coil.
4. Check/replace the inductor coil.
5. Check/replace the diode.
6. The LED's negative supply voltage is feed from the GAZOO IC.
There is a possibilty if the GAZOO chip is faulty, it will result to keypad light problem.
Reworking it might only fix the problem or replace if necessary.
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