Power ON-OFF switch Key Line paths for Nokia 1800 and Nokia 1616

Here's the solution to repair Nokia 1616 and Nokia 1800 power ON/OFF switch problem.
This problem may cause the device unable to power up when hitting the power key. The problem may easily configured if the power ON and OFF switch key has no response, but the device is not totally dead for it shows a charging indication when you charge it up. Now, this solution simply shows the line paths (ON OFF ways)of the power key.

Nokia 1616, 1800 Power ON OFF switch Line Paths (ON and OFF ways)

Hints for repair: when the device will unable to power up when hitting the power key button but it shows charging indication when you plug-in the battery charger, the problem may possibly lies on the power key line paths. But before tracing the line paths, you must see to it that the keypad membrane is perfectly clean and free from dirt, corrosion and oxidation. You can check the power ON/OFF voltage to the inner core of the switch key terminal pads, this voltage may range approximately  from 1to 3 volts. If there is no voltage reading you get on that spot, locate and trace the  test spots for the power switch, see the picture guide above, it is located just near the keypad LED. Make a continuity check by using a multimeter to those corresponding spots indicated on the picture guide, from the power key pads through to each corresponding component. The outer core is connected to a chip capacitor located near the clock crystal oscillator.

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No Signal problem for Nokia 1616 and Nokia 1800 solution

Here's the solution that shows the particular components that might get damaged when the Nokia 1616 and nokia 1800 having a signal problem issues. This repair solution guide shows the layout of a components and particular test spots to check during servicing NO network signal problem.

Nokia 1800 and Nokia 1616 No network signal Solution

The RF circuit is located at the bottom of the pcb board. The RF clock oscillator and the RF power amplifier chip is a good spots where to begin  checking up. Before trying to remove and replace this ic component, you may check the corresponding Vbat voltage first on the chip capacitors indicated on the picture. This Vbat voltage is a power supply voltage that came from the battery positive terminal. The TX chip resistor that have  resistance value of ohms is where a part of TX signal flows across to it from the RF clock oscillator, you may check it also.

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Solution to fix Charger Not Supported on Nokia 1800 and Nokia 1616

Charger not supported occurs if the battery temperature resistor is being damaged, This solution shows the exact location of this said chip resistor on the main PCB board. This chip resistor needs to replace if a charger not supported will show on the LCD display screen during when a battery charger is being plug-in.

Nokia 1800 and nokia 1616 charger not supported solution

The value of this said chip resistor is 47K, you may find a replacement on it any non working old nokia PCB board.

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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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