Keypad and LCD Display backlight LED failure solution for Nokia 1800 and Nokia 1616

This solutions shows the location of particular components or spare parts on the PCB board layout that might get damaged and cause the device for unable to light up the LCD display backlight LED's including the keypad backlight LED.

Nokia 1800 and Nokia 1616 LCD display backlights circuit components layout

This also includes the line paths of each particular voltage and current that feeds to the backlight LED's of the LCD display module from the inner most part of the main ic component solder ball bumps for deep troubleshooting analysis.

Repair tips: check and have a continuity test on all filter coils and each lines paths from where it is being connected according to the picture's layout

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Earpiece and Ringer Speaker Solution for Nokia 1800 and Nokia 1616

Here's the repair solution to solve and fix nokia 1800 and nokia 1616 Earpiece and Loud Speaker (Ringer/buzzer) failure. In nokia 1800 and nokia 1616 the earpiece and ringer circuit have been combined and connected to a single speaker unlike the old types which  have both different speaker in each circuit.

The  below solution picture shows the line paths and layout of components for the Earpiece Speaker.You may trace all of those corresponding components if having trouble with the earpiece or Earpiece Audio sound problem. The positive and negative audio signal which flow across into four coils, a chip resistor 4.6 ohms and an EMI filter chip before it being feeds to the Speaker terminal pads and so on to the speaker.

Nokia 1800 and Nokia 1616 Earpiece Speaker components layout and line paths

The two remaining components are chip resistors, this resistors are fusible resistors with has a zero ohms value. Both positive and negative Audio signals also flow into the two filter coils and the emi filter chip then feeds trough to the speaker.

Nokia 1800 and Nokia 1616 Loud Speaker ( Ringer/Buzzer) line paths and components layout


All those components are very easy to check and you may find a replacement on it if found busted or damaged. If all of its corresponding components were already replace and making sure that all of it working perfectly okay but the problem still exists and no audio sound can be heard over the speaker, we may now consider that the problem lies on the line paths between the main IC or the IC itself is being damaged. connections.

Nokia 1800 and Nokia 1616 Earpiece and Ringer IC component solder ball bumps connection

The last solution solution for this is to reflow, rework the main IC component. Be sure to check the line paths of corresponding solder ball bumps of the IC component which holds the earpiece or the  ringer loud speaker, after reballing it and inplacing it back.
Just be careful and have a good heat temperature and air flow control using you reworking station in handling the main IC module

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Microphone problem of Nokia 1616 and Nokia 1800 repair solution

Here's a simple solution that can be used to repair a damaged Nokia 1800 and Nokia 1616 Mouthpiece microphone problem, In this repair guide it shows the location of  particular components that might possibly damaged when the problem occurs. Tis solution can be used after in-placing or installing a new microphone module on the device but the problem still exists and does not solve the problem.

Mouthpiece microphone components layout and tracing line paths for nokia 1800 and nokia 1616

Repair tips:
1. Check or replace a new microphone replacement before proceeding..
2. make sure that microphone's contact pads is absolutely clean, a poor contact pads of the microphone's terminal also cause the problem.
3. check those two filter coil near the microphones contact pads, have a continuity check between the microphone's contact pad's core to each corresponding filter coil. The inner layer core is the positive and the outer layer core which  is the negative.
4. Continue to check the line paths across  to microphones circuit as shown on repair guide solution above. Trace and make sure that both positive and negative line is not cut or does not have an open circuit.
5. The B+ line indicated in the guide is the microphone's circuit power supply, If this said supply voltage is missing or cut also causes the microphone nonfunctional.
A poor quality audio sound signal also occurs if there is a damaged components on that part.
6. The IC component solder ball bumps that holds the microphones connection can be used to trace those lines if an internal cut or damaged occurred, when all of the above hints does not solve the problem.

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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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