Nokia 1616 Keypad and LCD screen display backlight problem solution

Nokia 1616 Keypad and LCD screen display backlight problem solution

Here's the Nokia 1616 solution for keypad and LCD screen display backlight LED problem, that result to dark screen display on the LCD screen and no illuminating light LED on the keypads.We revive this solution for too many new techies asking from our request box for a complete guide, since we already have created a solution for this in here.

Now, we are going to tackle a few more hints on how to easily solved the Nokia 1616 keypad and LED light problem situation if occurred.

The given solution will show you the much clearer image of the Nokia 1616 backlight LED circuit. The components and its connection line paths were completely highlighted for easy troubleshooting procedures.


Nokia 1616 LCD screen display and keypads LED back light problem solution


Here's the step by step hints on how to fix the Nokia 1616 LCD screen and keypad LED problem:
This may only works assuming that you already tried the software or firmware calibration but nothing happens.  So here's the hardware repair as follows:
1. Check the VBAT 3.7V supply voltage across the two inductor coils. Check also this coils if damaged, then replace.
2. Check the the Keypad backlight LED bulb below the the circuit. If that white LED bulb is damaged the LCD backlight will also not light up or glow. So ensure that its perfectly working or replace with a new one.
3. Trace the connection line paths of the LED+ and LED- to the spots were it is being connected. There is a test spots given on the PCB board where you can check the supply voltage of the LCD backlight LED.
4. Check the switching transistor, there are two 2.2 ohms resistors which is connected to ground, replace if found damaged or faulty.
5. If all of the above procedures has been done and seems there is no problem,. You may then replace the LCD if the LCD shows a dark screen. there is a tendency that the LCD's LED is already damaged.
You can also trace the backlight LED connection from the test spots down to the PINS or solder pads of the LCD screen, just to ensure that this connection is not open or cut-off.

That's it... hope you like this new version of Nokia 1616 solution from us. Enjoy!

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Nokia 5130 USB to PC connection Not detected Solution

This solution may help to fix if the Nokia 5130 unable to be detected by the PC when being connected via USB. If the driver is properly installed and the USB cable wire is okay but something went wrong and the PC won't detect the device.

The solution below show which particular components that needs to be check and or replace if found damaged. The USB connector pin and the corresponding components is being highlighted for easy checked up procedures.


Nokia 5130 USB to PC Not Detected Solution



There is a USB transceiver IC mounted near to the USB Pin connector, you  may replace this IC if found damaged

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Nokia 5130 Memory Card Not Detected or Not Inserted Solution

This solution below can be used to troubleshoot and repair a damaged Nokia 5130 that has a Memory card problem issues such as Memory card not detected or the device unable to detect the memory microSD card even it is being already inserted.

Ensure to update the device flash firmware first before you may proceed to used this solution.


Nokia 5130 Memory Card not Detected Solution


There is a detector switch on MicroSD slot holder that triggers the device to activate the MMC circuit, check it if it is still working. You can read a voltage on that spots when the microSD is not inserted and then it dropped to 0 volts when the microSD card is inserted.
 Check and ensure also the MicroSD card holderfree from dust, dirt, molds and oxidation build up, clean it if necessary.
Check the supply voltage of the MMC controller chip, If all of this voltages is okay, you may need to replace the MMC IC.

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Nokia 5130 Auto Shut Off, restart problem solution

Here's the Nokia 5130 Xpressmusic solution that we revive for some request, and this covers on auto shut off and often restart problem. This problem will cause the phone to automatically shut down even without switching it off or touching anything.

In order to fix this problem you may first try to flash, restore or update the device firmware, you may use a higher versions available like flash file rm-495 7.95, we already tested it for Nokia 5130c Xpressmusic.

Sometimes a software calibration doesn't fix the problem, like you succesfully flash the phones firmware many times using your flashing device but the problem still exits. Some problem is cause by a faulty hardware components. The solution below shows some components that if become faulty or cause by an oxidation it will result to auto shut off problem.



The ESD filter resistors on the button switches also cause the problem if damaged or oxidized. Visually check it, clean it, replace or remove it, the phone will still work without it..  but much better to replace it for it is an ESD protection components.
The keypads ESD/EMI filter if shorted or oxidized, it will cause the phone to hang up or frozen and the keypads doesn't work and also shut off the phone, it is because the power key is also connected to it.
You may clean it first, or rework it.

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Nokia 5130 power ON-OFF key jumper ways

Here's the Nokia 5130 Power ON and OFF key line spot for jumpering solution. This solution can help fix Nokia 5130 Xpressmusic that shows charging indication when the battery charger is plug-in but it does not turns ON when the power key is being pressed.
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.


The solution above shows the spots where you can apply a jumper wire when the power ON OFF key line path of Nokia 5130  is open or cut more

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Nokia X3-02 Camera Problem Solution

Here's a solution for Nokia X3-02 Camera hardware failure problem. The solution shows which components needs to check on the PCB board if the camera failed to work.

Note: you may first check, restore or flash update the device firmware before proceeding to hardware troubleshooting. If the firmware calibration already done but it didn't fix the problem, refer to the solution below and do have a check procedures on some components. 





The camera of X3-02 is mounted on the flex board connection, you may first visually check the flex ribbon for possible damaged. There are two supply voltages needs the camera to work, the VAUX1 2.78V and the VIO 1.8V voltage. You may check and trace these two supply voltages, in most cases if these voltages losses it will result to camera failure problem

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Nokia 2700 classic Power ON/OFF Key Solution - Switch button jumper ways

Here's the solution  that may help fix and repair Nokia 2700 classic Power problem. This solution is for Nokia 2700 classic that shows charging indication but doesn't  get On or power up when pressing the power key switch button.  Although this solution came late but  still there are many who are looking and requesting  this solution.

Nokia 2700C Power On -Off key Switch Line Tracks

There is line test spots near the Keypad filter IC that can be easily check the power/ end key line paths, just apply a jumper wire if that line is open or cut.
If the said line spots is okay, you may need to check and replace the upper Keypad Filter IC

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