Showing posts with label Nokia 1508. Show all posts
Showing posts with label Nokia 1508. Show all posts
Nokia 1508 No Display problem Solution
KM Sariful
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.
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.
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 Not Working Display Backlight LED Solution
KM Sariful
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.
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.
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
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 SIM Card Connection Line Paths- jumper ways solution
KM Sariful
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.
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.
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.
Nokia 1508 Keypad Malfunction Solution
KM Sariful
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.
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.
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 USB Charge Ways - Components and Connection Tracks
KM Sariful
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 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.