This solution covers for Nokia 6700 classic Backlight LED not working on the LCD screen display that result to a dark or black screen LCD display.
You may first try to install a new LCD screen module before applying or using this solution below.
If the LCD screen is already tried installing a new one but still the backlight LED still not working or unable to light up. You may then need to trace, check and or replace the components showed on the solution above.
There is a BVAT voltage line that supplies to the LED driver IC and you can check this voltage about 3.7 volts which is came from the battery positive terminal. and came way across to the two filter coils before it feeds in to the LED driver IC.
If the the voltage supply line is okay, remove the LED driver IC and trace each corresponding solder ball terminal line paths through to the pin connector and VBAT voltage line filter coils.
Rework and clean the solder ball terminal pads.
Replace the LED driver chip if the problem unsolved.
You may first try to install a new LCD screen module before applying or using this solution below.
Nokia 6700 classic LCD Screen Display No Backlight LED Solution
There is a BVAT voltage line that supplies to the LED driver IC and you can check this voltage about 3.7 volts which is came from the battery positive terminal. and came way across to the two filter coils before it feeds in to the LED driver IC.
If the the voltage supply line is okay, remove the LED driver IC and trace each corresponding solder ball terminal line paths through to the pin connector and VBAT voltage line filter coils.
Rework and clean the solder ball terminal pads.
Replace the LED driver chip if the problem unsolved.
This industry is usually divided into telephone equipment manufacturers and telephone network operators. Historically, network operators usually have national monopolies. In recent years, with the opening up and integration of the global telecommunications market and the development of technology, a situation in which multiple operators compete in the same market has gradually appeared.
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