Nokia 2720 fold LCD flex ribbon cable connector Nokia 2720 fold LCD flex ribbon cable connector Nokia 2720 fold LCD flex ribbon cable connector

Here's the basic Nokia 2720 fold solution for LCD screen display problems such as the following like white empty screen, blue screen, garbled or saturated screen, blurry or blur screen  displays and others as long you can hear that the phone is still working, like you can still hear the welcome tone, the keypad tones etc.

This may work if the LCD is not damaged, cracked or broken. For beginners  you may still need an LCD screen replacements for quick and easy technique by just confirming that the problem does not lies on the LCD screen. You may also check the device firmware first., if the firmware is okay then proceed to the given solution below.

Hints for troubleshooting the Nokia 2720 Display problems this may apply on the main LCD screen and the catalina LCD:

Check the flex ribbon cable assemblies for possible damaged.

Try to replace or install a new working LCD screen panel.

Nokia 2720 fold LCD flex ribbon cable connector

 If the LCD and flexible cable confirmed that nothing wrong with it, proceed to the PCB board hardware troubleshooting below. 

The solution below shows the connection line paths of the display data signals from the filter resistors through to the LCD flex pin connector. This is only the brief solution for we start our troubleshooting here.

First check the VIO and VFLASH supply voltages, you can read about 1.8V and 2.8V on that spots of the certain pins or through the capacitors. Then check all the resistors and trace its connection down to the LCD flex connector. This may useful especially when the device suffered wet or water damaged, replace and apply jumper if necessary. If this solution doesn't work, the problem may possibly then lies on the processor IC, it is because the display data signals is feed and comes from through it. A re-hot, re-work or replacement to the CPU IC will only fix the problem.

Okay, there you have it, the basic steps procedure in troubleshooting LCD screen display problem on Nokia 2720 fold. This once again created through by request of our colleagues on our Nokia solution request box.

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Nokia 2720 hardware repair solution for not working MIC (microphone) problem

Here's the Nokia 2720 hardware repair solution for not working MIC (microphone) problem. This solution shows the MIC tracks connection line paths., and certain components that holds for 2720 fold nokia mobile phone microphone circuit.

Just refer to the solution below then locate the highlighted components on the PCB board and follow some procedures we provide.

Repair hints for Nokia 2720 fold cell phone microphone problem.

1. Check the microphone for possible damaged using a multimeter, replace if found damaged.

2. Trace its corresponding connection line paths.

3. Check/resolder or replace  all the corresponding connected components such as the capacitors and resistors.

4. If the procedures doesn't fix the problem, the possible faulty is the LITEPLUS IC, re-heat or rework it if necessary.

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Nokia 2720 fold buzzer, hands free speaker problem solutionNokia 2720 fold buzzer, hands free speaker problem solution

Here's the Nokia 2720 fold solution for not working buzzer or hands free speaker problem. This solution provides some simple hints on how to fix the buzzer problem.

The Nokia 2720 the buzzer is mounted near the LCD screen displays and also associated with the LCD flex ribbon cable assembly connection. Refer to the solution below and follow some step by step guide on how to fix the buzzer or ringer problem.

Nokia 2720 fold buzzer, hands free speaker problem solution

Repair hints for not working nokia 2720 fold cell phone ringer speaker problem:

1. Check the flex ribbon cable assemblies for possible damaged, then replace if confirmed faulty.

2. Check the phone loud ringer speaker using a multimeter, or replace with a new one.

3. Check/clean the LCD flex ribbon cable pin connector.

4. Trace the connection from the pin 7 and 10 down to the two 120 ohms resistors near the LITEPLUS IC.

5. Check/replace the two 120 ohms resistors.

6. If the above procedures does not solved the problem, the possible faulty will be on the liteplus IC.

Enjoy!

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Nokia 2720 fold Volume UP(+) and Volume Down(-) Button Switch Connection TracksNokia 2720 fold Volume UP(+) and Volume Down(-) Button Switch Connection Tracks

If you are looking for the connection line paths of the Nokia 2720 fold volume up and volume down control button switch, here we show the complete circuit connection of the said two volume control button switches.

This solution is a big help especially for a damaged or already lifted solder pads of the switches terminals.. or already been replaced a damaged button switch but still it doesn't work and fix the problem.

The solution below shows the connection of the Volume Up and Volume Down button switch of Nokia 2720 fold. Refer to it and use it as your tracing guide to troubleshoot a not working volume button keys.

Nokia 2720 fold Volume UP(+) and Volume Down(-) Button Switch Connection Tracks

The two button switches share a common connection on its two upper terminals, which is connected directly to the keypad filter IC.

The lower terminals is Voume Up is also associated or connected to 0, 8, 5 and 2 keypad keys. While the Volume Down is connected to *, 7, 4 and 1 keypad keys. So, if also happens that those keypads keys doesn't work, it means that your problem may possibly lies on the filter IC.

You can check and trace this line paths using a multimeter. Then managed to apply a jumper wire if the said connection has been cut-off. Hope this helps in repairing volume control problem on Nokia 2720 fold cell phones.

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