Here's the Nokia 1508 solution for not working keypad back light LED problem. This solution shows the connection line paths of the keypad light that may be useful for troubleshooting the problem.

To fix a not working keypad light, you may first check the two LED's on the keypad matrix. These two LED's were connected in series connection, it means if one LED is bad the other one will also won't light up. So ensure that both LED's are working.If the two LED lights seems both working okay, refer to the solution below and do have a voltage reading and connection line paths tracing procedures.

Nokia 1508 Keypad Light Jumper Ways Solution

You may first check the battery positive supply voltage (VBAT) which is about 3.7V connection, then the negative line paths which has a resistor connected to it. Check and or replace the resistor also if necessary.The LED controller IC is the one that holds and engaged to switch ON and OFF the keypad led, it work as a switching mechanism of the keypad light. There is a possibility that the problem may also lies on the LED control IC and you may need to rework or replace this said chip just to fix such 1508 keypad light problem.

Nokia 1508 Full Keypad Solution - Tracks and Jumper Ways

Here's the Nokia 1508 solution for not working keypads or keypad failure problem. This solution may possibly help if the there are ceratain keys on device stop responding or working.

To fix keypad problem, you may first check and clean the keypad membrane and contact pads for possible corrosion and oxidation build ups. Each particular keys were connected into a group of one connection, so it means if there is only one or two keypad keys that doesn't work, there is a possibility that the problem may lies on an open or cut-off connection line paths. You may refer to the solution below for tracing a particular which doesn't work or respond.

Nokia 1508 Keypad Malfunction Solution

You may just trace a not working key to other key which is associated or also connected to it. The inner core and outer core both have different group of connection.
 Here's the keypad contact pads Inner and Outer core layer group of connection.
Note: this may differ or may not accurate to other 1508 units.

Inner Core:
Group A - soft left, send, 1, 4 ,7 and * keys
Group B - up, select, left and right keys
Group C-  down, 2, 5, 8 and 0 keys
Group D, soft right, 3, 6, 9 and # keys

Outer core:
Group A - soft left, up and soft right keys
Group B - send , left and down keys
Group C - select, 1, 2 and 3 keys
Group D - right, 4, 5 and 6 keys
Group E-  7, 8 and 9 keys
Group F- *, 0 and # keys

All of the keys connection were connected directly to the CPU main IC,  Some problems is also cause by a firmware or software interruption.

Nokia 1508 Power ON-OFF Key Jumper Ways

Here's the Nokia 1508 Solution for not working power ON-Off key. This solution may help if the device failed to turns ON while it shows charging indication on the display when the charger is plug-in.

To fix this problem, you may need to clean first the keypad membrane and the power key's contact pads for possible oxidation build up. If it seems cleaned but however still doesn't respond, refer  to this solution below for it shows the connection line paths of the power key, then do some test and tracing procedures.

Nokia 1508 Power ON-OFF Key connection  tracks

You may first check the battery voltage (VBAT) on the inner core. If there is  a voltage reading on that point, it means that its line path is okay, if got zero readings, you may then trace it connection down to the VBAT line, and manage to reconnect it. The outer core is were the power ON main line path and its connected directly to the chip, but you can still trace its line paths and reconnect it.. if the line is cut-off, according to the given solution above. There is also a possibility that the problem may lies on power and charging controller IC, you may need to rework or replace it if the device still unable to turn on and the above solution does not solved the problem.

Nokia 1508 Ringer, Buzzer IHF Speaker Solution

Here's the solution for Nokia 1508 with a not working ringer or IHF speaker problem. this simple solution may possibly help fix the phone if the ringer speaker failed or no alarm sound can be heard on it.

To repair this kind of problem, you may first check and replace the IHF( integrated hands free)  speaker for possible damaged. If the IHF speaker confirmed okay, you may refer to this solution below and do have a check and tracing up procedures on its connection line paths a connected components.

Nokia 1508 Ringer, IHF Speaker Jumper Ways

First try to clean the speaker terminal contact pads,. if this won't solved, do trace each of the speaker terminal contact pads connection down to the filter coils. Check the filter coils as well, then apply a jumper wire on it if the line is cut-off or open circuit. Replace the filter coil if already damaged. There is an audio amplifier that being used to boost the audio signal. You may also need to check and replace this IC if the above procedure doesn't solved the problem.

Nokia 1508 Earpiece Speaker Solution

Here's the Nokia 1508 Solution for Earpiece not working problem or  have an audio signal output over the receiver speaker. This solution shows the connection line paths of the earpiece speaker of the phone.

If the earpiece speaker failed, you may first check the speaker using the multimeter and set it to X1, you can hear a crackling sound on it and the multimeter pointer is moving. If does not respond or any sign of indication it means the speaker is bad or already damaged. Replace it with a new one if already busted.If the speaker seems working okay, try to clean the earpiece speaker terminal contact pads. Then check its connection line paths, refer to the solution below.

Nokia 1508 Earpiece Speaker Jumper Ways

If the connection line paths is okay check the two filter coils, replace if found damaged. There are two ESD protection diode besides the terminal contact pads, you may also check and replace this components, removing it, also works.In some cases like wet or water damaged, there is a possibility that the problem may lies on the AUDIO IC. Re-heating or reworking it, may also fix the problem and sometimes you may need to replace it, if severely damaged.

Nokia 1508 MIC Solution, Mouthpiece Microphone Jumper Tracks

Here's the Nokia 1508 solution for not working microphone problem. This simple solution shows the basic procedure on how to fix the phone if the said microphone failed to work.

Refer to the solution below and locate the highlighted component on the PCB board, then do some basic procedure on how to troubleshoot the problem.

Nokia 1508 Mic Ways- Connection Line Paths

To fix a microphone problem on Nokia 1508, you may first check the microphone module using a multimeter, or try to replace it with  a new one. If the microphone module seems working, check and read the microphone bias supply voltage. If the voltage reading is okay. Check all the corresponding connected components on the MIC circuit, you may start checking from the filter coils, diodes and bypass capacitors.
A poor, gargled and saturated sound quality is also cause by a faulty components on that circuit, you may replace the resistors and capacitors in the MIC circuit.

Nokia 1508,1508i Hardware Repair Solution for USB Not Charging Problem

Here's the Nokia 1508 and 1508i USB not charging problem solution., This shows some  hints on how to fix when the device is unable to charge up  when the charger is being plug-in.

If encountered this problem, you may first try to used any other working charger, and then clean the USB pin connector if still the device wont charge-up.If seems the above basic procedures wont help, refer to the solution below and locate the highlighted components showed on the following solution below.

Nokia 1508 USB Charge Ways - Components and Connection Tracks

First try to check the fuse, filter coil and the diode (if mounted) for possible damaged. Replace it at once if found faulty. Check and trace also the power supply voltage line paths from the USB pin connector down to the fuse and the filter coil.If seems all of the components and connection were both okay, you may then try to replace the USB VBUS controller IC. This chip holds and control the USB charging voltage before it feeds to the main charging control chip which is the Power IC.

Nokia 1508 Display Problem Solution

Here's the Nokia 1508 solution for display problem, like blue screen, blank or white screen, saturated or garbled LCD screen displays.This may help if the device already calibrated through firmware flash update and already been replaced the LCD module but the problem still exists.

If the device firmware is okay and already tried replacing a new LCD on the device and it doesn't solved the problem , you may refer to this solution below and do have a hardware check up and test procedures.

Nokia 1508 No Display problem Solution

To fix the problem you may first check the LCD pin connector for possible damaged and oxidation build up, clean or replace it if necessary. Then check each of the filter resistors since its the most vulnerable components connected on the display circuit. The bypass capacitors too may caused the problem if faulty or damaged, you may also check each one of those components. The display data signals is feed from the CPU chip, there is also a possibility that the display is caused by a faulty CPU IC in most serious cases problem like wet or water damaged device.

Nokia 1508 Dark Screen Display - No Light Solution

Here's the nokia 1508 hardware solution for not working LCD backlight LED and resulting to a dark or black screen display. This solution shows the connection line paths of the LCD backlight LED of 1508 device.


To fix LCD backlight problem on the phone, you may first try to install a new LCD screen module just to easily determine and confirm if the backlight LED are still working or not. Since the LED's were mounted at the back of it.


If the new installed LCD still shows a dark screen and the back light won't turn ON or glow. refer to the solution below and do have a check and tracing procedure on the display light components and its connection line paths.

Nokia 1508 Not Working Display Backlight LED Solution

The LCD display light has a LED driver used in it, you may first check the LED positive and negative  supply voltages connection line paths from the output terminals of the chip and corresponding components down to the LCD pin connector.

If all the line paths is okay, check the battery supply voltage (VBAT) on the LED driver. If the voltage reading is okay,  there is a possibility that the LED driver is faulty or damaged. replace it if necessary.

Nokia 1508 Insert Sim Card Error Solution

Here's the Nokia 1508 solution for insert sim card error problem or device unable to detect any SIM card being inserted to it. This solution may possibly help fix the phone for it shows the connection line paths of the SIM card circuit of the 1508 device handset.

In order to fix this kind of problem, you may first check and ensure that the SIM card pin connector is cleaned, an oxidation build up may also caused sim card error problem on the device. 

If the pins seems all cleaned and not damaged, refer to this simple solution below and do some tracing and check up procedure.

Nokia 1508 SIM Card Connection Line Paths- jumper ways solution

First trace each of the following pin connection line paths, like the VSIM, Ground, Clock, Reset and Data connection. The pins were all connected to a five pin filter IC, these IC is a diode used for ESD and EMI protection. You may check the said filter IC and or replace if necessary. The other components such as the resistor and capacitor were used for bypass and for SIM supply voltage filtering. You may also check and replace those particular components for possible damaged.

You can also apply a jumper solution, even without or the SIM filter is removed.  

In some severely damaged device like wet damaged or heavily dropped, some cases the problem lies on the main IC, (power and processor IC). By reworking or replacing it may only fix the SIM card error problem.