Note: this solution may only work and can be applied after ensuring that:
a) the Flash firmware is okay
b) the LCD Display module is okay or have tried replacing it with a new one
This solution below shows the display circuit connection of Nokia C3 and its corresponding line connections including the pin connector's pin configuration.
1. Check the LCD pin connector, make sure it is free from dirt, oxidation and corrosion. Clean it and apply solder if the pins found a cold solder or broken.
2. Check the two voltage supply it is 1.8 and 2.8 DC volt(see solution above)
3. Check the connected two resistors near to the pin connector this two resistor has a value of 0 ohms and 100 ohms. replace if found damaged.
4. If all of the above components is okay, the last and hard enough to deal with is reworking the JUNO chips. For beginners, you may ask assistance to your Head Technician or Master Tech, working with JUNO IC needs expertise, so apply extra precautions.