Nokia 5130 keypad solution, keys and switches connection tracing guide for repair

Heres the Nokia 5130 complete keypad solution, this solution shows each certain keypad key connections including the button switches such as the volume up and volume down control buttons and also the MP3 player button switches such as the Start/stop, forward and rewind button switches.

The solution may help repair and fix nokia 5130 keypad malfunction and button switches failure. You may check, trace particular keys which are not able to function by using the repair guide below. Each group of colors indicates that they are connected with each other. So just locate where that particular non working key being connected and mend it found cut or open.

Nokia 5130 xpressmusic keypad keys malfunction full tracing solution

The Power ON/OFF key is isolated and not connected to other group of key connection for it only holds for switching or powering up the device. There is an open spots near the keypad filter IC that the power ON and OFF key can be connected when the power key fails or or if the line is cut or open.

Nokia 5130 ON-OFF power key jumper ways 

And heres the internal connection of the keypad filter IC, you may check and apply a temporary jumper on this components to ensure that the inner line paths from the application processor is not being damaged.

Nokia 5130 keypad filter IC jumper ways 
source 

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nokia 101 white display solution

             NOKIA 100,101 WHITE DISPLAY SOLUTION

 CHECK ALL TRACKS AND COMPONENTS 

                                                                      click on image 

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.

Nokia C2-03, C2-06, C2-08 Memory Not Detected Solution (MMC IC Jumper Tracks/Ways)

Heres another solution that covers for Nokia C2-03, C2-06, C2-08 memory card not detected problem cause by wet damaged or any possible causes like oxidation build ups etc.The Nokia C2-03, C2-06 and C2-08 slider phone has designed with a built in ESD and EMI filter chip that protects the system circuit if theres something went wrong from the memory card. In most Nokia PCB design this chips were also found and called as "MMC filter IC". So, in troubleshooting Memory card not detected problem mostly it can be fix by replacing the said MMC IC.

Heres some hints on how to fix Nokia C2-03, Nokia C2-06 or Nokia C2-08 Dual SIM card, slider phone with touch and type features.
1) If memory card is not detected error shows, try to use another working memory card. The memory card might be corrupt  or already damaged.
2) Check for possible damaged and or clean the memory card connector pins and its surroundings components on the PCB board. 
3) Check the firmware, reflash, restore or update to latest version if necessary.
4) Check, resolder, rework or replace the memory card filter chip (MMC filter IC)

Nokia C2-03, C2-06, C2-08 Memory Not Detected Solution

LG GM 200 Mic100% working solution

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.