This solution covers for Nokia C5-00 with a not working or a failure of illuminating keypad white LED lights.
This shows us the basic details of the components that holds for the keypad LED backlight circuit.
Just refer to given solution below and locate the highlighted components on the Nokia C5 PCB board layout.
Repair hints for nokia C5-00 keypad backlight LED problem:
1. Visually check the keypad circuit components, if oxidized clean them.
2. Check the keypad white LED light bulb using a multimeter set to X1 or Resistance.
3. Check the Keypad flex matrix connector for possible damaged.
4. Check/replace the two 100 ohms resistors near the GAZOO IC. it is where the white LED positive supply voltage feeds.
5. Check/replace the components composed of a Resitors, ESD protection diode, and a Transistor IC near the battery terminal, those components holds for the white LED negative supply switching voltage.
You may only need to read the VBAT 3.8V and check or replace the inductor coil and diode near the GAZOO IC if the LCD display backlight is also missing. Those components holds both the display and keypad backlight positive supply voltage. Hope this helps... Enjoy fixing damaged mobile phones!
This shows us the basic details of the components that holds for the keypad LED backlight circuit.
Just refer to given solution below and locate the highlighted components on the Nokia C5 PCB board layout.
Nokia C5-00 Keypad white LED light not working problem solution
1. Visually check the keypad circuit components, if oxidized clean them.
2. Check the keypad white LED light bulb using a multimeter set to X1 or Resistance.
3. Check the Keypad flex matrix connector for possible damaged.
4. Check/replace the two 100 ohms resistors near the GAZOO IC. it is where the white LED positive supply voltage feeds.
5. Check/replace the components composed of a Resitors, ESD protection diode, and a Transistor IC near the battery terminal, those components holds for the white LED negative supply switching voltage.
You may only need to read the VBAT 3.8V and check or replace the inductor coil and diode near the GAZOO IC if the LCD display backlight is also missing. Those components holds both the display and keypad backlight positive supply voltage. Hope this helps... Enjoy fixing damaged mobile phones!
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