Nokia 1680c, 1681c Full Keypad Solution with Filter IC Jumper Ways

Here's the full solution for Nokia 1680 and 1681 classic with keypad not working problem. this solution shows the connection line paths of the keypad keys for easy troubleshooting and repair certain keys that doesn't work or unresponsive.

The inner core and outer core layer of the keypad contact pads were group into one certain connection,
The keypad filter IC also been used in the circuit for keypad ESD and EMI protection.
Just refer to the simple solution below to trace any particular keys that got a problem.

Nokia 1680c,1681 Keypad Connection Tracks

You may clean first all the corresponding keypad keys contact pads on the PCB board including the keypad membrane before proceeding into troubleshooting.
Just simply trace first each of the corresponding connection line paths for possible cut-off or open circuit. Just mend or apply a tiny jumper wire to reconnect the open line paths.
If seems that all of each corresponding connection were both okay,  the problem may possibly lies on the keypad filter IC (glass or crystal IC). Replacing it is the only option to fix the keypad problem on Nokia 1680c or 1681c.

Nokia 1680c,1681c Charger Not Supported Problem Solution

Here's the Nokia 1680c and 1681c classic hardware repair solution for 'Charger Not Supported Problem'. This solution shows and provides some simple hints on how to fix this phone problem if occurred, due to wet damaged or accidentally dropped.

To fix this problem, you may first try to use and replace the phone's battery and use another working battery charger. If the problem still exists, refer to the solution below and locate the highlighted components on the Nokia 1680c or 1681c PCB board.

Check and clean the battery terminals, then try to replace the BTEMP 47K resistor as shown above.
If after changing it doesn't fix the problem, the problem may possibly lies on the UEMCLITE chip.
Try to reheat, rework the chip then replace if necessary. This option may help fix and solved the Nokia 1680c or 1681c charger not supported problem.

Nokia 1680c,1681c, Camera Failure Problem Solution

This is the Nokia 1680c or 1681c classic camera failure problem solution like, camera hardware acceleration failed etc.
This solution provides some hints on how to fix the problem.

For camera failures, you may first try to restore, flash update the device flash firmware before proceeding to hardware troubleshooting.
if however that the flash firmware is okay, you may then refer to the solution below and do some check up and replacement procedure on some components.

Nokia 1680c,1681c Camera Problem Repair Solotion

first check all the camera supply voltages like camera DC supply voltage regulator IC. 
If all of these voltages is okay. Try to replace the camera module.
If the camera module is okay, Reheat, rework the camera IC and then replace if necessary.

Nokia 1680c,1681c Display Light Problem Jumper Ways

This is a solution for Nokia 1680c or 1681c classic display backlight LED problem and it shows a dark screen display. This solution provides a some hints on how to diagnose and fix the phone's display light problem.

To solved this problem, you may first try to replace and install a new LCD module to easily determine if the LCD LED's were still working or not. If the newly installed show same problem, refer to the following solution below and check some components that holds for the LCD backlight LED's.

Nokia 1680c,1681 Display Light Jumper Solution

Check and clean the LCD pin connector, for possible damaged and oxidation build up. Trace each corresponding LED connection down to a components where it is connected, check also and then replace that components if found damaged. Check and read the LED driver supply voltage and the filter coil. If these voltage is missing the keypad LED will also not work. If both LCD and the Keypad LED doesn't work, replace the LED driver IC.

Nokia 1680c,1681c Charging Jumper Ways

Here's the Nokia 1680c and 1681 classic Charging Problem Solution. Just refer to the solution below and then locate the highlighted components and do some check and replacement procedures.

To fix charging problem like charger no response or shows no cahrging indication when the battery charger is plug-in, you may first check the charging pin connector for possible damaged or use another working charger. If that does not solved the problem, check the fuse and the protection diode as shown on the solution below.

Nokia 1680c or Nokia 1681c Not Charging Solution

You may also trace the charging voltage connection line paths for possible open or cut-off lines. If both charging components and the line paths is okay the possible problem is caused by a faulty UEMCLITE chip,. You may need to reheat or rework this chip and replace if necessary.

Nokia 1680c,1681c Local Mode/Test Mode Problem Solution

For Nokia 1680 classic or 1681c Local mode or test mode problem that shows on the display when turning the device ON,. This solution below might possibly help fix the problem.

Refer to the solution below and locate the highlighted components on the PCB board and do a replacement procedures.

Local Mode- Test Mode Problem Solution for Nokia 1680c and 1681c

First try to remove the BSI BTEMP resistor which has a rated value of 10K then try to turn the device power ON again. If the Local mode or test mode disappears, replace that said BSI and BTEMP resistor, do not leave it remove for it will caused a flashing problem in the future.
The components near the battery connector will also be check and replace if after removing or replacing the BTEMP and BSI resistor doesn't fix the problem. Some local mode and test problem on nokia 1680c or 1681c is caused by a faulty UEMCLITE. reworking or replacing it will only fix the problem.

Nokia 1680c,1681c Fake Charging Problem Solution

Here's the solution for Nokia 1680c and 1681 Fake Charging problem or the device shows charging indication but it doesn't stored or saved on the battery. This problem may caused the device unable to charge up and caused the battery drained quickly.

To fix this problem locate the highlighled components on nokia 1680c PCB board and then do a replacement on that said component.

Nokia 1680c or Nokia 1681 Classic Fake Charging Problem Solution

For fake charging problem on the device replace the O.22 ohms resistor and also trace its connection line paths down to the battery's positive terminal.

Nokia 1680c &1681c Power ON-OFF /End key Jumper Ways

Here's the solution for Nokia 1680c and Nokia 1681 classic that unable to Turns ON but it shows charging indication when being charge. This problem may possibly caused by a faulty POWER/END key.

To fix this problem, you may first check the keypad matrix and the keypad membrane for possible oxidation build up, clean it if necessary. If the cleaning does not fix the problem, you may refer to the solution below and trace the power /end key connection line paths.

Nokia 1680c and 1681c Power Key Connection Tracks

Locate the capacitor showed and then trace its connection to the inner core of the power key pad. Just manage to apply a jumper wire if the line is cut-off or open. The outer core is connected to the ground lines, check it also. There is also the possibility that this problem occurred is caused by a faulty UEMCLITE IC. reworking or replacing it, only fix the problem.

Nokia 1680c,1681c Display Problem Solution

Here's the solution for Nokia 1680c and 1681 classic display problem such as blank screen, blue screen and white screen display problem.

To fix display problem like blue and white screen, you may first restore and flash update the device flash firmware, display problem such as this is sometimes caused by a firmware failure. If the firmware calibration doesn't fix the phone, you may then consider that the problem lies on hardware failure.

For display problem hardware troubleshooting, you may first try to replace the LCD screen module. then refer to the solution below if the newly installed LCD shows the same problem.

Nokia1680c and 1681c Display Connection Line Paths

You may first start checking the display pin connector for possible damaged, clean it also if an oxidation build up found. Check the VIO and VFLASH LCD supply voltage pins. Trace each of the corresponding display signal line paths. There were four Resistors connected on it, this resistors has a rated value of 100 ohms each, check and replace it also, if found damaged.
If the above procedure does not solved the problem, you may then consider that the problem may lies on the CPU chip. Reworking or Replacing it will only fix the display problem on Nokia 1680c or 1681c.

Nokia 1680c,1681c MIC Problem Solution with Jumper Ways

Here's the Nokia 1680c and 1681c Solution for not working mouthpiece or microphone problem. This solution shows the connection line paths of the device MIC's circuit for easy troubleshooting or repair.

To fix MIC problem on Nokia 1680 and 1681 classic, you may first check the microphone module using a multimeter - to confirm if it's still working or not. You may also clean the MIC's terminal contact pads if there's an oxidation build up found.

If the microphone seems okay and the contact pads is cleaned but the problem still exists, refer to the solution below and check the connected components to it and trace also its connection line paths.

Nokia 1680c and 1681c MIC Connection Line Paths

You may check and replace all the corresponding filter resistors and capacitors. If all the resistors had been check and or already been replaced but doesn't fix the problem, check the MIC Bias Voltage, if the voltage is missing,. The possible faulty is the UEM IC, reworking it might only fix the problem.

Nokia 1680c and 1681c Earpiece Receiver Speaker Problem Solution

This is the Nokia 1680 and 1681 classic solution for not working Earpiece Speaker problem. This solution provides the connection line paths of the receiver speaker that is may useful for an easy repair procedure.

Here's a simple instruction on how to diagnose and fix the receiver speaker problem: First check the receiver speaker for possible damaged, replace if its already busted. Clean the speaker terminal contact pads, an oxidation or corrosion build up may also cause the problem. Then refer to the solution below if the above basic procedure doesn't fix the problem.

Nokia 1680c and 1681c Earpiece Speaker Connection Line Paths

Check and replace the filter coils and capacitors, trace also its connection down to the terminal contact pads.
If those components were okay and the lone paths is good. Try to reheat the UEMCLIT chip, rework or then replace if necessary.

Nokia 1680c,1681c Ringer or Hands Free Speaker Problem Solution

This is the Nokia 1680c and 168c solution for not working ringer or hands free speaker problem, that result to no ringtone or loud speaker sound can be heard on the device.

This solution below shows the connection line paths of the hands free speaker for easy troubleshooting and repair. But to fix a speaker failure, you may first check the speaker using a multimeter to easily confirm if its still working or already damaged. If the speaker is okay, clean the speaker terminal contact pads and locate the components shown on the solution below, then do a check an replacement procedure.

Nokia 1680c and 1681c  Speaker Problem Solution

First check the filter coils and the ESD protection diodes on each speaker polarity connections, then replace if found damaged. Trace also each corresponding connection from the speaker terminal pads down to the components where it is being connected.
The circuit used a AUDIO AMPLIFIER chip, to boost the sound loudness. You may also check and replace this said chip, but first check the battery supply voltage of that chip before attempting to replace it.

Nokia 1680c and 1681c Headset Not Detected Problem Solution

Here's the solution for Nokia 1680c and 1681 headset not detected problem. If encountered and try to fix this problem, you may refer to the solution below and check the highlighted components.

If the device won't detect any headset being plug-in to it, you may first check the headset pin connector for possible damaged. Then check and replace those highlighted components on the following solution below.

Nokia 1680c and 1681 headset not detected solution

Try to replace the 100K resistor  and 1u0 capacitor, this components holds the headset detection mechanism. You may also use this solution if the device always showed the headset icon even the headset is not plug-in.