Nokia C2-03 Keypad Light LED Problem Solution

In this solution we show you the Nokia C2-03 keypad LED light components which is useful to fix when the  keypad LED failed to work. There are two white LED light used in in illuminating the keypads, it may also get damaged due by water, wet or cause by oxidation build ups.

The solution below shows the connection line paths of the two white LEDs which is more convenient in tracing broken spots. It also shows which nearby particular components it is being connected or part of the keypad back lighting circuit.

Heres the some hints that may preferably help fix in troubleshooting Nokia C2-03 keypad back light failure. 

1. Check the whole area and surrounding components for the keypad white LED for possible damaged, cracks, oxidation etc. Clean it first if necessary.
2. Check both of the two LEDs using a multimeter. Replaced if already damaged.
3. If the LEDs light are still working check the (VBAT 3.7V) battery voltage line paths.

Nokia C2-03,C2-06,C2-08 Keypad light problem Solution

4. Check each of the LEDs positive and negative connections.
5. Check the  connected resistors and coils, re-solder or replace if damaged
6. Check the LED driver transistors. Re-work or replace if necessary.
View larger picture here.

This solution may also works on Nokia C2-06 and Nokia C2-08 since they both similar PCB board layout with Nokia C2-03 a Dual SIM card built in capability and a slider phone.

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Nokia C2-03 LCD Back Light LED Problem Solution

Okay, due to some folks requesting this solution, here comes the Nokia C2-03 LCD screen display backlight LED problem solution.  We already have the keypad light solution postedhere, so this gonna be a continuation of the white backlight LED troubleshooting for Nokia C2-03. This will also work on C2-06 and C2-08 a dual SIM card slider phone.

Since Nokia C2-03 is a slider phone and used a UI flex (flexible ribbon cable), that is use to connect the LCD screen display from the main PCB board. Now in fixing backlight problem on the display, we must always consider that the flex is vulnerable and may cause the problem.

Here how to troubleshoot the Nokia C2-03 backlight LED problem:
For quick fix, on minor problem like if the phone status shows no indication of being wet by any liquid, free of oxidation build up or the PCB board is still clean.
- Check the Flex ribbon cable wire.. replace if damaged.
- Check/ try to replace the LCD screen, the white LEDs on it may already been busted.

This figure shows the connection line paths of the backlight LEDs on Nokia C2-03 UI flex cable. There are two white LEDs also mounted on both sides of the top part of the flex.  This two LEDs were also connected to the inner backlight LEDs of the LCD screen.
Take note: the LCDs backlight  is also connected in parallel circuit like the two LEDs on the flex - meaning if that two LEDs was still able to light up but not on the LCD, it means that the LCDs backlight LED is already busted. So check that out...


View in larger image.

The Nokia C2-03 backlight driver components.
In this figure shows the detailed components or parts that is called "LED driver circuit".
This will cause the display backlight loss if one of these components being damaged and or each of its connection line paths breakdowns. This circuit may only damaged if the device suffered wet or water damaged that resulted into oxidation build ups and then caused a short or open circuit.

view the larger image .

So, check out these parts:
- Clean these components surface if necessary.
- Check each of the filter coils first. Replace if found damaged.
-  Trace the VLED and VBAT_BB connection line paths - point to point to the corresponding capacitors, filter coils and including down to the Flex pin connector.

Nokia 500 Ringer/Buzzer/HandsFree Speaker Problem Solution

Heres another solution for Nokia 500 speaker problem. Previously we show you the earpiece speaker problem solution, this time we got the buzzer speaker part to tackle with.
In this solution shows the connection line paths of the Nokia 500 IHF speaker and its components.
You can use this to troubleshoot if the there is no any audio can be heard over the speaker, like ringtones, music and in loud hands free mode. You may locate the components that I highlighted on below picture and check that certain area for possible damages might occurred. The speaker is replaceable and fixing this kind of problem was not  that much hard enough. This problem may only sometimes happens if the device suffered wet damaged and or accidentally heavily dropped.

GsmAngel Nokia 500 Speaker Problem Solution

View in larger image

Hints to fix Nokia 500 IHF Speaker problem:
1. Check the IHF speaker assembly for possible damaged and or misaligned. Use a multimeter to check i, replace if already busted.
2. If the speaker is okay, check and clean the speaker terminal contact pads. Corrosion might weakened and loosen the connection.
3. Trace the speaker+ and speaker- connection to each certain components where it is being connected.
4. Check and replace the filter capacitor and resistor components.
5. If the above method doesnt fix the problem, the possible defective part is the GAZOO chip.
Reworking or replacing  it might only fix the problem, but that tasks needs a good soldering skills. So, dont touch that chip if you have not enough knowledge in reballing a ball grid array (BGA) chips.  Particularly that IC for it also holds as the power integrator of the whole circuit.

Thats it., Enjoy!
Its been a long time since I dont have any new post on this blog of mine. Hope, you arent tired of keep visiting my blog..

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