Nokia 6710s Charger No Response Solution

This solution may help how to fix Nokia 6710 Not charging problem like it shows no charging indication when the battery charger is plug-in.
Just refer to the solution below then check those particular components on the PCB board.

Nokia 6710s Not Charging Solution
nokia 6710 not chrging repair picture
Check the chip fuse if already damaged and then the chip diode for possible short circuit or shorted.
Just replace it if already damaged.
There is also a possibilities that the problem lies on the power IC, reworking or by replacing it is the option to fix charging problem on nokia 6710 navigator.

Nokia 6710s charger not supported solution

This solution may help on how to fix the nokia 6710 with charger not supported problem. If the phone shows charger not supported when the battery charger is being plug-in, you may try to use another working charger and phone's battery.

If the problem still exist, refer to this solution below and locate the highlighted components on the PCB board.

Nokia 6710 charger not supported solution
nokia 6710 charger not supported repair picture
Just replace the 47k BTEMP (battery temperature) resistor, this may possibly help fix the problem.

Nokia 6710s Display Filter IC Jumper Ways

This solution may possibly help fix Nokia 6710 navigator with display problem.
It can be used to repair the phone's display problem such as blank screen, garbled or saturated screen, white or blue screen displays.

If already tried installing a new replacement LCD screen or a flex ribbon cable but still the display problem still occurred. You may refer this following solution below, for it shows the display filter IC connection line paths.

Nokia 6710 Display Problem Solution
nokia 6710s display IC jumper ways and tracks

You may then try to replace each or both of the display filter IC or mend how to apply solder jumper on it if having problem finding the replacement chip.

Nokia 6720c Charger Not Supported Solution

This solution may possibly help fix Nokia 6720c charger not supported problem.
When the battery charger is being plug-in to the device and it shows charger not supported you may refer to this solution below for it shows the certain component that may possibly caused the problem.

Nokia 6720c Charger Not Supported Solution
nokia 6720c charger not supported solution

You may just try to replace the BTEMP (battery temperature) resistor shown on the solution above, this resistor has a resistance value of 47 kilo-ohms

Nokia 6720c local mode/ test mode problem solution

This solution may possibly help fix Nokia 6720c that shows on local mode or test mode on the LCD screen display. If this happens refer to the solution below for it shows which particular components needs to be check and or replace for possible damaged.

Nokia local mode/ test mode problem solution
nokia 6720c local mode test mode solution

You may just try to remove or replace the ESD protection diode and the filter capacitor shown on the solution above. These components is connected to the BSI (battery stats) of the device circuit.

Solution for Nokia 6710s navigator not working upper keypad keys

This solution covers for Nokia 6710 navigator upper keypad keys problem.
If one of the upper keys like "Left, Right, Select, Soft Left, Soft Right, Send and Menu keys" doesn't work or stop responding or working, you may refer this solution below for it shows the connection line paths of the Nokia 6710 upper keypad keys.

Nokia 6710s Upper keypad Solution
If encountered upper keypad keys problem, you may first check the upper keypad board and flex ribbon assembly for possible damaged, just replace if found already damaged.

If after ensuring that the flex and upper keypad board is okay and already tried replacing it with a new replacement spare but doesn't  fix the problem: Try to replace the keypad ESD-EMI filter chip.

Nokia 6710s Keypad Solution - Numeric Keys Problem Solved

This solution covers for Nokia 6710 navigator keypad problems, if one of the following keys like 1,2,3,4,5,6,7,8,9,0,#,* and space doesn't work or not responding.

The solution below shows the connection line paths of the Nokia 6710 keypad keys. You may trace it connection accordingly by the given solution below.

Nokia 6710 slide keypad solution with filter IC jumper ways
nokia 6710s keypad jumper ways tracks
There are two ESD/EMI filter used in the numeric keys, you may replace these filter chips if many of the keys doesn't work or each particular connection line paths is not open or cut.

Nokia 6720 classic Insert Sim Card Solution

This post holds for Nokia 6720 classic Insert Sim Card problem issues most significantly if the device suffered water damaged, this solution may possibly help the problem.

If the device won't detect any sim card being inserted to it, try to clean the SIM card connector pin first. Just refer to the solution below for further troubleshooting.

Nokia 6720c insert sim card problem solution
nokia 6720c insert sim card jumper ways tracks

You may first check the SIM card supply voltage (VSIM) and ground connector pins line paths. If both were all okay, the next option will be by reworking the GAZOO chip or replace if necessary.

Nokia 6720c USB Not Charging Solution

IF having problem on USB charging on Nokia 6720c, refer to the solution below and check those certain components that holds for USB charging operation.

Check the USB pin connector first and try to clean it. Then proceed to check the components shown on the solution below.
Nokia 6720c USB charging problem solution
nokia 6720c USB charge jumper ways

Check the fuse first if it is already busted or burned out, then the chip diode for possible short circuit.
Just replace if found damaged. IF the fuse and the diode were both okay, Rework or try to replace the USB charging chip.

Nokia 6720c USB Device Not Detected Solution

The following solution hods for Nokia 6720c USB problem. If trying to connect the phone to the PC and it shows that the device is not detected after trying several times or using another USB cable but still the PC cannot detect it t, this solution below might possibly help fix the problem.

Nokia 6720c USB not detected problem solution

You may first check the USB pin connector for possible damaged and clean it as well. Check the following components near to it like the filter coils, fuse, diode and capacitors. , just refer to the solution above.
If the problem still occurs, the next option is try to rework or replace the USB transceiver IC.

Nokia 6720c Ringer, Buzzer Hands Free Speaker Solution

This covers for Nokia 6720 classic ringer speaker problem. If the speaker doesn't work or no sounds can be heard on it, this solution may possibly help fix the problem.

You may first check the speaker if already busted or try replacing it with a new one. If the speaker seems good, you may then ensure that the speaker terminal contact pads is cleaned. Refer to the solution below to locate which particular components needs to check or replace for further troubleshooting.

Nokia 6720 classic Ringer hands free Speaker problem Solution
nokia 6720c ringer speaker jumper ways tracks
 There are left and right speaker channels on Nokia 6720c, you may just refer to the solution above to troubleshoot certain speaker that doesn't work.
You may first check the filter coils that is connected through to the speaker, then trace each of the corresponding line paths. If both filter coils and line paths seems nothing wrong, the last and final option will be by reworking the GAZOO IC.

Nokia 6720c Earpiece Speaker Solution

This is solution covers for Nokia 6720c earpiece speaker problem.If the receiver speaker doesn't work or no voice can be heard on it, this solution may possibly fix the problem.

You may first check or replace the earpiece speaker module, then ensure that the speaker's terminal contact pads is perfectly cleaned. If the speaker is okay, you may then trace the its corresponding line paths and components were it is being connected.
Just refer to the solution below to trace and locate these particular components.

Nokia 6720 classic earpiece problem solution
nokia 6720c earpiece speaker jumper ways

There is a filter coil being used on the circuit, check it and then replace if found damaged.
If the line paths through to the filter coil is okay and likewise the filter coil is still working, the next option will be by reworking the audio controller chip or then replace if necessary.

Blackberry curve 8520 stuck in headset activated mode when making a call solution

Here's a solution for blackberry curve 8520 that the headset shows or in activated mode when making a call or someone calling the unto the device.

If trying to fix this problem do this some simple steps below:
1. Try to upgrade or update the blackberry 8520 firmware.
2. Pull the battery out and reinsert it back again in a few seconds.

If the above doesn't' work, you may then proceed to hardware troubleshooting.
The solution below shows a certain components that needs to be check.

Blackberry Curve 8520 headset activated mode solution
blacberry 8520 headset activayted mode solution

You may first try to clean the headset jack, then reheat, rework or replace the chip shown on the solution above if the problem still occurs.

Finally here, Google Voice for iPhone

Apple relents and allows Google Voice

If you are a Google lover and an iPhone user  , this might be your day. Apple has decided to allow Google Voice into the App Store and its about time get it.


The Google Voice application allows you to route your calls through a phone number of your choosing, transcribes voice mails into text and gives you some pretty cheap international calling rates on top.
Here's the full list of Google Voice features

Loosen up the AT&T shackles with FREE SMS through Google Voice also.
Get Google Voice in the Apple App Market

One of the Best Android Calendar Application

One of the most fantastic calendar application for android phones

Gemini Calendar offers a huge array of useful options for planning your schedule. It’s popularity in the market speaks for itself…4.5 stars, 1380 ratings and a market leading < 250,000 downloads...makes Gemini 'The Calendar App to Get'. Just please support the Developer with a donation. This is a FREE app that could easily sell for $5.00 or more.


Gemini Calendar features:
* events recurrence with intervals of x days/weeks/months/years,* easy data entering with innovative data input method,
* comfortable month view with easy, instant access to the events,
* configurable data and time format, first day of week,
* active links in event details (WWW address, phone numbers,emails and map),
* multiple reminders ( up to 8 ) can be added to a single event,
* recurrent events can be set according to the days of week (separately selectable Mo, Tu, We etc.),
* new event can be added with relation to the call log of your phone,
* new event can be added with relation to the phone book of your phone,
* ‘go to date’ dialog in the Month/Day view lets you switch the current date using the same input method as in Add New Event,
* three different shortcuts for the launcher:
o Add normal event,
o Add event from log,
o Add event from book,
* day widget,
* copy & paste events,

Get Gemini Calendar

Nokia 6720c Charger Not Supported Solution

This may help to solve to fix and Nokia 6720c charger not supported problem. You may just replace the component showed on the solution below.

nokia 6720c charger not supported btemp location
If charger not supported shows when the battery charger is inserted, just replace the 47K resistor showed on the solution above.

Nokia 6720c solution for not charging problem

This is the Nokia 6720c classic not charging solution that may possibly help fix the device if unable to charge up or shows no charging indication when the battery charger is being plug-in

Just check and replace the components showed on the picture below, these components were composed of a chip fuse and a chip diode.

Nokia 6720c Not charging solution
nokia 6720c charge jumper ways

Nokia C7 Insert SIM Card Solution

This solution holds and may useful to fix and repair Nokia C7 with insert SIM card problem or it doesn't accept or detect any SIM card being inserted to it.
Just configure the solution below for it shows the connection of the SIM circuit on Nokia C7 PCB board layout.

Nokia C7 Insert Sim card Solution
nokia c7 insert sim card jumper ways tracks

The Nokia C7 SIM card connector is mounted on a flex board assembly. You may need to try to replace the whole sim flex board if already damaged.
If the SIM flex board seems okay but still the device won't accept any sim card.
You may check the corresponding components that is were it is connected on Nokia C7 main PCB board. 

Nokia C3 Insert Sim Card Solution - SIM Tracks

Here's a solution for Nokia C3 with Insert Sim Card problem that doesn't detect a SIM card being inserted to it.

This solution guide shows the connection tracks of Nokia C3 sim card pin connector down to the SIM filter IC. You may just refer to the solution below to trace and check each corresponding pin connector connection if trying to fix insert sim card problem on nokia C3.

Nokia C3 SIM card pin connection line paths and filter IC jumper ways

nokia C3 insert sim card jumper ways tracks
You may check the VSIM and ground pins first before trying to replace the Nokia C3 SIM filter IC.
You can also apply the filter IC jumper solution above to determine if all the line paths were working okay.

Nokia C7 Power Switch ON OFF Jumper Ways Solution

Here's a full power on-off switch connection tracks of Nokia C7 which can be useful to fix a damaged or lifted solder terminal pads of the power switch.

If the power switch is severely  damaged and the PCB's solder pads has been already removed, you can easily reconnect the nokia C7 power switch by using this solution below.

The line paths were highlighted to easily determine were particular components that the power switch is being connected. You may just mend to in-place the power switch to its original location and then apply a bonding solvent, then apply a jumper wire on it to the nearest components were it is being connected.
The power switch upper terminal were both connected to ground lines (highlighted in blue) and the other two below is for positive or in active connection (highlighted in red lines).

Nokia C7 Power ON-OFF switch Jumper Ways
nokia C7 power switch jumper ways tracks


If those components being connected become faulty or damaged, it will also result to unable to TURN ON the device and its only shows charging indication when the battery charger is being connected. You may check and then replace this components if the Nokia C7 power switch is not working.

Nokia E73 Full Keypad Problem Repair Solution

This solution can be used ro fix and repair Nokia E73 with a keypad problem that is not working or responding, due to wet or water damaged.


This following solution shows the entire connection of the Nokia E73 keypad circuit, which can be useful for easy and quick troubleshooting methods.

This first solution shows the entire keypad flex matrix of QWERTY and NAVIGATION keys connection line paths. With this solution you can easily manage to trace a particular keys which does not work or responds.
The inner and outer core of the keypads where highlighted into different colors, each of the same colors means that these particular keys were connected with each other.


Nokia E73 keypad Flex matrix connection - tracks jumper ways

This solution below covers for Keypad Filter IC troubleshooting. There are two keypad filter chips is being used or mounted on Nokia E73 PCB board. IF one of these keypad filter IC become faulty it will result to a massive  keypad failure. The keypad filter chips solder ball bumps is being highlighted with colors for deeper troubleshooting procedures especially when the device  suffered water damaged. You may easily trace each of the connection tracks to determine if all the line paths were all okay.

Nokia E73 keypad Filter IC jumper ways
nokia e73 keypad IC jumper ways

In replacing the keypad filter IC you may need to carefully ensure that all the solder ball bumps were not lifted or damaged. In most common cases these filter chips were only become damaged due to a short circuit, excessive electromagnetic interference and electrostatic discharge. You may need to replace these chips for ESD and EMI protection on the other circuit on the device.

Nokia E73 Joystick Not Working: Solution

Here's a full solution for nokia E73 with a non-responsive joystick problem; this repair guide might possibly help fix the problem.. 

A. Check the optical joystick module and the whole keypad flex matrix assembly for possible damaged. Clean the lens of the optical joystick module. Replace the whole keypad flex matrix if it is already damaged.

nokia e73 joystick solution
Check and trace the two supply voltage of the optical joystick module mend a jumper wire if these line paths is open, or just replace the keypad flex if a replacement spare is available.

Nokia E73 Joystick Jumper ways and tracks
nokia e73 joystick jumper ways and tracks

If the keypad flex is already been replaced but still the joystick doesn't work.
Trace the keypad pin connectors which holds for the optical joystick connection. If these voltage is being cut off it will also result to a non-responsive joystick.

Nokia E73 Joystick Problem Solution
nokia e73 not working optical joystick repair

There are two 3D accelerometer chip that controls the joystick, if these chips is faulty the joystick will not be able to work. By reworking or replacing these accelerometer chip might only fix the nokia e73 with a non-responsive joystick problem.

Nokia E73 Display Problem Solution - Filter IC Jumper Ways

here's a solution for Nokia E73 LCD screen display problem such as blank or empty screen, blue screen, white screen, garbled or saturated screen displays.

This solution below shows the line connection line tracks of Nokia e73 display signals. If already tried installing a n new replacement LCD screen but the problem still exists you can used this solution for further hardware troubleshooting.

Nokia E73 Display Filter IC Solution
nokia e73 display ic jumper ways tracks

the solution above shows the two display filter chip, you may need to trace, check and replace these filter IC's.

Nokia E73 Ringer Buzzer Speaker Jumper ways and Tracks

This solution below can be used to troubleshoot the Nokia E73 with a Ringer or Hands Free speaker problem.

If the ringer is speaker is working okay but still there is no sounds can be heard on it, this solution below can help fix and solved the ringer speaker problem for it shows the connection line tracks and particular components of the ringer speaker circuit.

Nokia E73 Ringer - hands Free Speaker Problem Solution
nokia e73 hands free speaker jumper solution

Nokia E73 Earpiece Speaker Problem jumper ways tracks

The solution below shows the nokia e73 earpiece speaker connection line tracks, that can be used in troubleshooting nokia e73 earpiece problem, or no sound can be heard on it.

See the solution below for easy and quick tracing the line paths of the E73 earpiece speaker and circuit components.

Nokia E73 Earpiece Speaker Jumper Ways and Connection Line Tracks
nokia e73 earpiece speaker jumper ways tracks

Nokia E73 Charger Not Supported Solution

Here's the solution for nokia E73 charger not supported problem, a type of not charging problem that only shows on the display "charger not supported" when the battery charger is being plug-in.

The repair guide manual below shows the location of a certain components that needs to replace to solve and fix the Nokia E73 charger not supported problem.

Nokia E73 charger not supported solution - BTEMP resistor location
Nokia e73 charger not supported solution

Nokia E73 USB not charging problem solution

If having a charging problem on Nokia E73, this solution might possibly help to fix and repair it.

IF the device shows no charging indication or response when the USB charger is being plug-in, there might be something wrong with the components shown on solution below,
Just check and then replace these components to fix nokia E73 Not charging problem

Nokia E73 USB charging problem  jumper ways solution
nokia e73 USB charge jumper ways tracks

Nokia E73 MMC not detected solution

This solution holds and may possibly help fix or repair nokia E73 with MMC memory card problem such as memory card not detected or does not detect any memry card inserted to it.

Just refer to the solution below and trace or check particular connection line paths and components.

Nokia E73 MMC memory card not detected solution
nokia e73 MMC jumper ways tracks

Nokia E73 Mic Jumper Ways Tracks

This solution can be used to fix Nokia E73 with a not working microphone problem.

If the microphone nokia E73 stops working you may refer the solution belows for it shows the connection of the Nokia E73 Microphone circuit.

Nokia E73 Mic Jumper Ways Tracks
Nokia

Nokia E73 Insert SIM jumper Solution

This repair guides solution covers for Nokia E73 with insert SIM card problem that occurred when the device suffered wet or water damaged.

IF encountered insert sim card problem on nokia E73 just see the solution below and trace the corresponding SIM card Pin connection to a particular components.

Nokia E73 SIM jumper ways
Nokia

Nokia E73 Power ON OFF Jumper Ways Solution

This repair guide cover for a damaged Nokia E73 power ON OFF switch. If  looking for the spots where to apply a jumper wire when the power switch solder terminal pads is lifted, this solution may help to solved that problem.

Nokia E73 Power ON OFF switch jumper ways - tracks
nokia e73 mode power switch jumper ways

Nokia 1280 hardware repair solution

Download the nokia 1280 all hardware repair solution.
 This solution pack covers the following hardware repair problems on Nokia 1280 such as:

nokia 1280 charger not supported solution
nokia 1280 charging solution, jumper ways guide
nokia 1280 keypad jumper ways
Nokia 1280 LCD display backlight LED solution
Nokia 1280 LCD display jumpers ways
Nokia 1280 LCD display ways
nokia 1280 mic problem jumper solution
nokia 1280 No network signal solution
Nokia 1280 power on-off key Jumper ways
nokia 1280 sim card  jumper ways2 guide


Download Nokia 1280 hardware repair solution

Nokia 5800 blurry or blurred LCD screen display solution

This solution can help fix a nokia 5800 xpressmusic with a blurred LCD screen display without changing or replacing the LCD screen.
The solution used a simple tricks to solved and fix a blurry picture display on Nokia 5800 Xpressmusic.
 However, you must try to replaced the LCD screen display first, and if there is no louck and the problem still exists, only then you will use and apply this method.
nokia 5800 expressmusic display problem solution

Nokia 5800 LCD blurred LCD screen display repair solution
DOWNLOAD

Nokia X3-02 Blank LCD Screen Display Problem Solution

This solution holds for nokia X3-02 with a display problem such as blank screen display, blue screen, garbled and saturated screen display.

If this said display problem occurred on nokia x3-02, you may first check the or try to replace the LCD screen module. If the display problem still exists, you may now proceed to check and or then replace the one of the two display filtering IC showed on the solution below.
These display filter chips is mounted near the CPU IC.

Nokia X3-02 LCD Screen Display Problem Solution
nokia x3-02 display filter IC jumper ways

Nokia X3-02 Not Working Keypad Problem Repair Solution

Here's the solution for nokia X2-02 with a not working keypad problem. This solution shows the location of the keypad filter ic on nokia X3-02 PCB board.
If the keypad flex is not damaged or already tried replacing it but the keypad still doesn't respond when pressed, you may need to replace the keypad filter IC showed on the following solution below.

Nokia X3-02 keypad problem repair solution
nokia X3-02 keypad filter IC ways

If the keypad flex cable wire is not damaged, replacing the keypad IC may possibly help fix and solved the Nokia X3-02 with a  not working keypad problem.

Nokia X3-01 Hands Free Ringer, buzzer, speaker

This repair guide holds for nokia x3-01 Ringer and Hands free Speaker no sound problem, this solution may work and can be applied if the buzzer speaker is not damaged and or already tried installing new replacement speaker but still there is no sounds can be heard over it.
The solution shows the some particular components on Nokia x3-01 PCB board that needs to check and replace for possible damaged. Just refer the solution below and check the said components.

Nokia X3-01 Ringer speaker Solution

Nokia X3 Service Disassembly Manual

This manual will show you a step by step instructions on how to disassemble thew Nokia X3 mobile phone handset which is set for repair or troubleshooting.

This manual also includes some precautions for a safety dismantling the device including which and what particular tools to used.

Download Nokia X3 Disassembly Manual in PDF file format

How to remove and unlock Nokia X3 security code using MXkey

Here's a step by step instruction on how to remove and unlock forgotten security code on nokia X3 by using MXkey mobileEx professional service suite.

Procedures:
You need corresponding USB cable and mxkey service suite.

Open Mxkey
Select Nokia USB ROM then connect
Select Nokia Tools(BB5 tab)
Select Model(X3)
Select flashfile(to detect phone in bus check )
Click bus check(if the phone detected and shows the info,proceed to the next step)
Then Click Service then Reset all..

 If the X3 cannot be detected  via USB and been already installed Nokia Connectivity Cable Driver, Just 
try not to hold long the power key, don't allow to power up your phone, just press power on and if it is detected release it immediately.

 Here's the codes log for a successful security code unlocking on Nokia X3 device.

Nokia 5320 MMC Solution - MicroSD card Not Detected

This solution covers for Nokia 5320 Xpressmusic that does no detect an inserted microSD memory card.
This problem may caused by a faulty MMC IC on Nokia 5320 PCB board.
The repair guide shows the location of the MMC card that needs to replace to solve Nokia 5320 Memory card Not detected problem.

Nokia 5320 MicroSD Memory Card Not Detected Solution
nokia 5320 MMC IC jumper ways tracks

Nokia C1-01 MicroSD Memory Card Not Detected Solution

The solution below can be used as a guide to repair Nokia C1-01 MicroSD memory card not detected problem. This problem indicates and it shows that the memory card is not inserted or detected on the device even already tried many kind and working microSD memory card but still the device won't detect it.

Nokia C1-01 MicroSD Memory Card Not Detected repair Solution
Nokia
The solution above showed the MMC filter IC for which filters the MMC data signals. If this IC is damaged this will cause the Nokia C1 failed to detect the microSD memory card.

Guide and solution to repair Nokia C1-01 Microphone failure

This solution can be used to fix Nokia C1-01 Mic or mouthpiece microphone if it has no voice sound can be heard on the other device when a call is made.
The layout solution below which will show you where and what particular components that needs to be check and or replace if the microphone problem occurred on Nokia C1.

Nokia C1-01 Mic failure repair solution
nokia c1 mic ways solution
The microphone module is being mounted on Nokia C1 PCB board and there are filter coils and resistors connected to it.

Nokia C1-01 Earpiece Speaker Repair Guide

The solution below can be used as a repair guide to fix Nokia C1 Earpiece Speaker that dose not work or no voice sound can be heard when making a call on the device.
This solution shows the components that needs to check on Nokia C1-01 main PCB board.

Nokia C1-01 No Earpiece Speaker Sound Solution
nokia C1 earpiece speaker repair manual
You may check the components showed on the solution above if the earpiece speaker is working okay and or already tried installing a new replacement spare speaker.

Nokia C1-01 Not Charging Repair Guide

This solution can be used as a guide to repair Nokia C1-01 Not charging problem such as charger no response, this means that it does not indicates or show the charging status on the LCD display when the charger is beiong plug-in.

Just see the solution below for it shows which components that needs to be check if the problem occurred on Nokia C1-01.



Nokia C1-01 Not Charging Repair Solution
nokia C1 not charging repair manual

Check the components indicated on the solution above and replace if found damaged. This may possibly fix Nokia C1 not charging problem.

Nokia E63 Full Keypad Solution with Filter IC Tracks

This solution shows the the full keypad connection line paths of Nokia E63 keypad filter IC and keypad flex pin connector. This solution can be used to fix Nokia E63 keypad not working problems.

Nokia E63 Full Keypad IC Jumper Ways
nokia e63 keypad ic full ways tracks

iPhone 3Gs LCD Display backlight Not Working Complete Repair Solution

This is the solutions that covers for iphone 3Gs LCD display screen backlight not working or unable to light up and result to a dark screen display. If ever encountered this problem on iphone 3Gs especially wet damaged devices this solution a big help for it consists of two different stages of repair.

I have fix this problem many times and this solution solved the problem. I have been tried installing a new LCD screen module but the problem still exists.
There is spots on the iphone 3Gs located at the LCD pin connector that most often  get damaged and result to the display backlight won't work.
Just download for the clearer and larger image of the solution below to see and try it for yourself.

Download iPhone 3Gs Backlight Not Working Solution