Backlight is not working properly on iphone 3gs

[Denholm]

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I have encompassed an iphone 3gs through a dim backlight. The predicament is with the intention of the backlight determine to flash when the lcd first turns on and then go off. Sometimes the backlight determines to work without a predicament for a small number of days. Then the apparatus will start acting up the entire in excess off again. The device does not demonstrate signs of water damage. I have previously replaced the 6r8 coil and endeavor a dissimilar lcd, still similar predicament. Anyone have some ideas. I previously replaced the coil. I was anticipating for an additional solution.

[Abhimanyusuta]

I have changed coil two times. Subsequent to altering the coil, and you have encompassed no backlight, go to the menu and bring the ruler of brightness to greatest. I had revolutionize this coil 3times on a phone. No backlight and then I take a give the impression of being to the brightness control menu. I do not believe what I saw. The ruler was on zero. Take a give the impression of being to this, previous to you going crazy. The board is of 3Gs, other than is a diminutive bit dissimilar of standard board, at right of coil, approximately two square mosfet, beneath these are a IC unknow.

[Mumtaz86]

It's extremely strange with the intention of two months ago the predicament was easy, and today not. Might somebody give me a hint how be able to I create the jumper between the mentioned points on top of it. I tried through hot air other than I might not create the wire stick through the contacts. I have comprised and completed a couple and it’s a real pain. I utilized solder paste Used a needle point and position it where it desirable to go, it looked approximating diminutive silver caviar eggs. Then hit it through hot air category of on then off the area till it melted.

[Joshe]

I have an iphone 3gs through a dim backlight. The problem is with the intention of the backlight determine to flash when the lcd first turns on and then go off. Commencing from time to time the backlight determine to work without a predicament for a few days. Then the apparatus will start acting up the entire in excess off again. Device does not demonstrate signs of water damage. I have previously replaced the 6r8 coil and tried a dissimilar lcd, still similar predicament.

[Winnebago]

I have tried to revolutionize 109 IC, on the other hand through coil, but no success. I have comprised and verified the correlation for jumper, other than am not the predicament. I believe to facilitate the predicament is alsewhere. The battery voltage passes commencing from side to side the 6.8uH inductor which numerous users have had to revolutionize, then enters the anode of the schottky diode, leaving its cathode at pin 6 and working with unswervingly to pin 3 of the LCD connector, through a small number of decoupling capacitors associated to the line.

[Tamali]

I not be able to really observe much else on the schematic which has an understandable fraction to play in the control and power supply to the LCD's LED backlights. It's an luxurious gamble, although, as the power IC is luxurious. When I asked a supplier why it was so expensive, I was told with the intention of demand is high due to their ordinary failure, and make available was low. I had purchased mine commencing from China utilizing alibaba dot com subsequent to receiving in touch through every company supplying them until I achieved a superior deal on price for the fraction and the cheapest shipping method probable.