Here's a solution for Nokia 3720 classic with no display problem and it shows only a blank or empty screen. This solution may works if you already confirmed or tried replacing the LCD screen module and then you can still hear a tones or audio from the device.
Hang or frozen and white screen can be fix by restoring or flash updating the phones firmware, but sometimes it is cause by a hardware problem issues especially those suffered by wet or water damaged.
On Nokia 3720 classic, the display data signals are feeds directly from the CPU (RAPStack IC) and there is no EMI/ESD filter chips is being used. Refer to the solution below and locate where the said IC is being mounted.
Here's some hints on how to troubleshoot the Nokia 3720 classic with display problem:
1. Check,replace and ensure the the LCD is working.
2. Check the phones firmware, flash, restore and update it.
3. Check, clean or re-solder the LCD pin connector.
4. Check and trace the LCD supply voltages (VAUX 2.78V and VIO 1.8V) from the LCD pin connector down to the capacitor near the Power IC (AVILMA).
5. If all above procedure didn't solved, the possible faulty is the CPU IC (RAPStack). A re-hot, rework or replacing it well only fix the problem.
Enjoy!
Hang or frozen and white screen can be fix by restoring or flash updating the phones firmware, but sometimes it is cause by a hardware problem issues especially those suffered by wet or water damaged.
On Nokia 3720 classic, the display data signals are feeds directly from the CPU (RAPStack IC) and there is no EMI/ESD filter chips is being used. Refer to the solution below and locate where the said IC is being mounted.
Nokia 3720 classic LCD Display Problem Solution
1. Check,replace and ensure the the LCD is working.
2. Check the phones firmware, flash, restore and update it.
3. Check, clean or re-solder the LCD pin connector.
4. Check and trace the LCD supply voltages (VAUX 2.78V and VIO 1.8V) from the LCD pin connector down to the capacitor near the Power IC (AVILMA).
5. If all above procedure didn't solved, the possible faulty is the CPU IC (RAPStack). A re-hot, rework or replacing it well only fix the problem.
Enjoy!
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