Chosen Solution
Hello community! I’ve been repairing iPhones for a while - stand at around 215 successful to date. HOWEVER, today I’ve received an iPhone 6s in need of a screen replacement. The phone worked with the cracked screen. I installed my new screen without transferring the front camera & home button to test, and it worked fine. After transferring everything I closed up and BOOM the phone display stays black. Later I found that the phone is on, and if I shine on it with a torch I can see the display. For the first time I read about “long screw damage”? I am 100% certain my screws went into the right holes. What I did not do: was remove the battery before repair. I’ve never done this and never had an issue. Anyhow: what are my options to repair? I cannot do board level repairs. I bought the customer a new phone, but am trying to minimise my losses by fixing the old phone. I live in South-Africa and cannot find any repairers close to me?
FL4211 is the little filter that blows most often when not disconnecting the battery during screen change. The “IC” is just to the left of the Capacitors and diodes in red with top right pad (in red)
This is a photo of the Backlight connection to the screen assembly that can sometimes short out if not covered
As far as I heard it’s coused by not disconnecting the battery, therefore the backlight IC is damaged and need to be replaced. I have never tried to replace this IC nor I know where it is located on the board.
Just like you; replace screen and no back light. So it turns out that the back light fuse is not blown. There’s a little piece of black tape that covers the back light sensor underneath the ribbon that is attached to the frame. Put the black tape back just as the original was and the back light will work again.
