Backlight issue => bad connector screen solderings?

Hello,

I get an iphone 5 which go into some water (red sticker)

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All is working except the backlight which works but at a low level so to determine if it was a problem from the motherboard or the backlight itself, I put another working screen on it and.... the same thing however when I test it the screen wasn't in its compartiment so I can slightly moved the screen (and the connector is a little affect to this action too) and the backlight is directly affect; more bright or less depend on the orientation of the screen.

So I looked closely on the screen connector and it seems that the screen connector is badly solder on 4 pins (judge by yourself thanks to my pictures), can you tell me or confirm that these pins are used by the backlight ? or just send me the scematics of this chip

Thanks

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Most likely problem = short on backlight coil.

Your backlight filters are not the components that are burned/corroded in your picture, but they are near--you should replace them and backlight coil.

You will certainly have corrosion under those shields--desolder and clean.

Jessa

Yes those pins are bad---and so are your backlight filters--i circled them for you. You need to get all that fixed up if you want your display to work---and given that you have obvious corrosion in the areas you can see, I would bet that you would also be highly likely to have corrosion in the areas you can't see under the EMI shields covering 90% of the board. Get them off, get everything cleaned, replace all your damaged components---otherwise you'll have a dead phone soon enough---that's just the way it seems to go.

jessa

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Thanks for your reply

I think I didn't explain my problem right... when I inclinated the front panel (so included the backlight) which is not in its final emplacement like on step 5-6 of this guide

iPhone 5 Teardown

Also without the shield of the front panel connector then the backlight worked time to time it depends how I inclinated the screen that's why it can't be a problem with chips, components...

Can you confirm that these pins are bad solder ? (I have another iphone 5 board and pins are better solder than this)

Also can you tell me if these pins are used by the backlight or just send me the schematics so I can find it by myself

Thanks for all

por

Yes you're right but since it still works, I will replace them later ofr the moment I just want it to work normally ....

So do you have schematics or just tell me if these pins are used by the backlight ?

Thanks again for all

por

Yes they are and so are the filters.

por

Finally I just put on my brain and follow the filters tracks to the connector...

Anyway I just resolder these pins and.... voila

It works like a sharm however filters are waiting for my soldering iron

por

Last question: could you give me the model of each filter (coil ? capacitor ?) and also tell me relative to the picture of jessa which one is

Thanks

por

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Those are all filters with the same values. FL24, FL25, and FL26 are 240OHM 0.2A 0.8OHM ferrite beads. They are available at places like this. Hope this helps, good luck.

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Thank you so much

por

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Hey guys just confirming, FL24 is the 240 ohm resistor?

Thanks guys.

Neil

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