yeah make sure it's the right lcd.. both the 3g and the 3gs look exactly alike except for the connections. the 3gs will not fit on the 3g board.
if it's the right one. try another lcd.. if that doesn't work.. a pin could be burnt on your boards lcd connection. that would need to be resoldered on.
if the pins on the connector look fine and if your phone is a 3gs, the backlight coil could be out. and that also needs to be resoldered on the board
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if it's one of those this guy can explain it and help out. info@applepierepair.com
yeah make sure it's the right lcd.. both the 3g and the 3gs look exactly alike except for the connections. the 3gs will not fit on the 3g board.
if it's the right one. try another lcd.. if that doesn't work.. a pin could be burnt on your boards lcd connection. that would need to be resoldered on.
if the pins on the connector look fine and if your phone is a 3gs, the backlight coil could be out. and that also needs to be resoldered on the board
if it's one of those this guy can explain it and help out. info@applepierepair.com