Nokia X3 No LCD and keypad backlight LED solution

Here's a solution that may possibly help fix and repair Nokia X3 Failure of LED backlight  on keypad and LCD screen display. This solution completely shows the lines paths and particular components that may need to check and replace if the LED backlight failed to light up.Nokia 5700 White screen and Blue Screen Display Problem Solution

Nokia X3 No LCD and keypad backlight LED repair solution

There is a fusible resistor is been connected to the LED backlight circuit in case a short circuit occurred if the device is being damaged by a liquid (Wet Damaged). See solution above marked with number 1.
That resistor is the one feeds the power supply from the phones battery.
If that resistor is open both keypad and LCD display LED's will not light up for it is the main LED supplying positive voltage.
The negative current or voltage has two circuits, one for the LCD (marked with number 4) and the other one is for the keypads (marked with number 3).
You may check / replace each particular corresponding  connected components highlighted on the picture for further troubleshooting.

 Nokia X3 LCD and keypad backlight LED failure solution

Nokia C3 Display Problem Solution - White, blue blank screen displays solution

Here's a solution that may possibly help fix and repair Nokia C3 display problem like white screen, blue screen, blank screen, garbled and saturated screen displays.
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.Nokia 5030 Charging problem solution Charger No Response Repair solution

Nokia C3 Display problem solution ( LCD pin connector's line tracks)

Repair Tips:
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.

Nokia C3 Display Problem Solution - White, blue blank screen displays

Here's a solution that may possibly help fix and repair Nokia C3 display problem like white screen, blue screen, blank screen, garbled and saturated screen displays.
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.Nokia 5030 Ringer, hands free loud speaker no sounds output repair solution

Nokia C3 Display problem solution ( LCD pin connector's line tracks)

Repair Tips:
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.