iPhone 3GS iPhone 3Gs Backlight Not Working

Discussion in 'iPhone' started by Sparkyx, Jul 17, 2010.

  1. Sparkyx

    Sparkyx Member

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    Device:
    iPhone 4S (White)
    So when life hands you a free iPhone, you don't pass it up. One of my friends gave me his iPhone 3Gs because he was going to throw it out due to the backlight not working and I stopped him.

    I'm not sure if he got any water in it before...the water damage sensor in the headphone jack is still white. I figured the LCD was bad, so I tested it in a working phone. The LCD works fine. I tried a known working LCD from another 3Gs in my 3Gs. Same problem. So now that I know that it's a problem with the logic board and not the screen, does anyone know what could be the problem?

    The previous owner had someone else service it who obviously didn't know what he was doing. The home button prongs were bent the wrong way and the home button didn't work either (I carefully bent them back into place) and I noticed that the screws holding the logic board weren't in the original spots (There was a screw with part of the DO NOT REMOVE sticker on it, in a different hole from where the screw originally was.)

    Everything seems to work fine on it. It is an old bootrom 3Gs with the 3.1.2 SHSH saved, so I restored it to 3.1.2 and jailbroke it with redsn0w and even unlocked it with ultrasn0w...The only thing wrong with it is the backlight. As of now...it's pretty much only good for a parts phone...but if anyone knowledgeable with the logic board could help me out, that would be great.

    Thanks,
    -Adam

    ####################################

    I found a few solutions. It bypasses the backlight coil.

    This one seems to be the one to try. I am going to have to get a micro soldering iron.
    http://blog.techsick.com/guides-tutorials/iphone-3gs-no-backlight-fix/

    These also were what I looked into. The top one contains a good hardware layout of what controls what on the logic board.

    http://mobileshardware.com/viewtopic.php?f=21&t=47

    http://www.mobileshardware.com/viewtopic.php?f=21&t=145

    I will probably try to fix this and let everyone know how it goes.
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