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Heres the solution that may possibly help fix and repair a damaged or malfunction qwerty keys on Nokia N97. This solution works if the N97 qwerty keypad membrane is already been replaced but some of the keypad keys still not responding.

The solution below shows the line paths of the Qwerty keypad connection of Nokia n97 PCB Board. This connection pattern shows the tracing guides including the qwerty keypad filter IC through to the Keypad pin connector.


There are two keypad filter chips used on Nokia N97 keypad circuits. You may check and replaced these EMI-ESD filter IC after ensuring that the QWERTY keypad membrane flex seems working fine and or already tried to replace a new replacement spare. Check and ensure also that keypad Pin connector are of free from dust and oxidation build up.

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This solution may possibly help fix and repair a damaged Nokia 7230 that result to Insert Sim card problem issues. If the mobile handset device does not accept any kind of sim card and only shows insert sim card in the LCD Lcd display, you may refer to this solution below to trace and check certain components that might get damaged and result to insert sim card problem.
The solution above shows the connection of the sim card pin connector and its signal line paths through to the GAZOO IC.
You may need to ensure that SIM card pin connector is perfectly clean and free from any oxidation build up.
The SIM card supply voltage or VSIM is one particularly line paths that may need to check first for this line paths will easily open or cut especially if the nokia 7230 suffered water  damaged.
If the Sim voltage line is okay and you get a voltage reading on that area. You may then proceed to suspect that the GAZOO chip is faulty, reworking the chip might help fix and solve the Nokia 7230 insert SIM card problem.

This solution can be used as  a guide to fix or repair Nokia N97 microphone problem issues. A failure that no voice can be heard from the caller on the device.

This solution solution shows the components location of Nokia N97 microphone circuit that needs to be check if the problem occurs.
Repair tips:
Ensure to restore or flash the device firmware first before trying to calibrate hardware components.
If flash firmware updating  is already been done and nothing happens , you may then proceed to troubleshoot hardware components.
a) Trace and check the supply lines paths of the microphone module.
b) Check and or replace the resistors highlighted on solution above, the two resistors have 0 ohms resistance value while the other one has 100 ohms.
c) If all the resistors seems all working and or already replaced and the supply voltage is okay, you may then replace the digital microphone module.

For further troubleshooting Nokia N97 Microphone failure, there are instances that you may need to rework the audio IC(AVILMAS) and sometimes the problem lies on a faulty CPU IC (RAPIDO).

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if mic is not working in Nokia 5233 our voice can not be reached to destination mobile during voice call and we can not record audio recording in it.to solve this mic problem in Nokia 5233 you can follow a few steps as given in post bellow.

in above diagram there are some different color lines which are to define tracks of mic and parts that are used in it.check these path with meter and if any of them is missing then apply jumpers as shown in above diagram.
if any part is missing or damage replace those parts with new that you can get from other mobile boards.
for more detail and new tips and tricks about cellphone service problem keep visiting this page we will update daily this blog timely with other mobile solution.

6233 MMc Solution

if you have insert sim problem in Nokia 5800 then it can be solve with a few steps that are written in this post.look at the diagram bellow and follow few steps that are givenin it.in case of insert sim problem, no sim, invalid sim.
 

in first step check sim pints in mobile may be they are damage or corbon on it.then rub it and check.if problem can not be solved then after dis assambly of Nokia 5800 check all parts that are shown in above diagram and also check all tracks.
all path are defined with different colors so that you can easily find out them.and replace them or apply jumpers to solve Nokia 5800 insert sim problem solution.
for more detail and new tips and tricks about cellphone service problem keep visiting this page we will update daily this blog timely with other mobile solution.

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If ever trying to fix Nokia X6 touch Lcd failure issues and youll do replacing the touch plate module, trying to calibrate the touch Lcd setting but unresponsive and restoring, upgrading and flashing the device firmware but nothing happens, the problem still exist and the touch Lcd left unresponsive.
This sometimes happens if the device suffered due to a wet damaged, heavily dropped and any related damaged accidentally done by the user. In this case only a hardware repair may only help solved the problem.
This solution below show the Nokia X6 PCB board components that holds and control the touch Lcd panel to work.

The solution above showed  a Touch Accelerometer chip that   used to sense orientation,  detect direction in multi-access direction of the Touch  Plate module. If the chip is damaged the touch Lcd will not work and remains unresponsive. This chip needs a DC supply voltage of 2.78 volts in this designed on Nokia X6 and also. The 2.78 Dc volts is also feeds and supply the touch plate module.
You may check this supply voltage first before trying to rework, re-ball or replacing the touch accelerometer  chip.