Heres the Nokia 2690 hardware solution for LCD display light problem. This problem may result to show a dark or black screen display for there is no illuminating backlight LED on the back of the LCD screen.
To fix the dark screen display problem, you may first try to replace or install a new LCD screen module, to easily confirm if the LCDs backlight LEDs were still working or already damaged.
You can also check the LEDs using the multimeter if you can manage without damaging the LCD flex connector.
If the newly installed LCD still shows the same problem and the LED light doesnt light up, refer to the solution below and locate the highlighted components on the PCB board.
Friday, December 6, 2013
Nokia 2690 Display Light Problem Solution
Nokia 2690 Display Light Problem Solution
Nokia 2690 Display Light Jumper Ways
Check the filter resistors and capacitors connected to positive and negative supply voltage of the LED pins.
Trace also each connection line paths were it is being connected to a certain components such as the resistors. Check and replace also the chip transistors.
If both keypad LED isnt working also, check the VBAT battery voltage on the filter coil and check also the coil for possible damaged. If the voltage reading is okay, replace the LED driver IC, for it also control the supply voltage both on LCD and Keypad Light LED.
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