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iPhone 7 No LCD/No Backlight, but home button reacts

Hi,

I have a liquid damaged Iphone 7. I replaced one of the LCD connectors since some pins was burned .

The liquid seemed to be on the lcd flex, and connectors, and not all over the motherboard. Therefore i have not preformed any ultrasonic cleaning yet.

There is no picture on the LCD and backlight is dead, but the phone vibrates when i touch the home button. I have tried to ghost type the lock code, but the touch screen seemed unresponsive (no vibration after failed attempts).

Does someone have any experience where to begin fault finding, or known components that fails after similar damages ?

Thanks

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If the device was water damaged the board should have been ultrasonic’d no matter what. Having the device on could be causing severe damage. Even if you cant see water doesn’t mean it hasn’t gone deep into the logicboard

At this stage i would take the board out, ultrasonic. Use new components to test. Battery, screen, chargeport.

Upside is that the home button might still work i guess..

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Thanx,

I know its kind of stupid not to do a clean. It was not water though, but spirits;) Anyway i'll do a clean. There is no heat-up of any kind when the power is connected though. So i'm hoping the brain of the phone still works. I have tested with new battery and lcd so i'll change the charge circuit as well.

It's unbelievable that touchID works, this is why i bother. so some brain function is working.

cheers

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Yes, the entire backlight, image, and home button/fingerprint sensor circuits. These are commonly fried when iPhone 7 hits water at the bottom of the phone. It sounds, incredulously, like you have attempted to change the lcd connector without even taking the board out of the housing. If you do, then the damage will be obvious at the very bottom of the board on the back side.


If you have taken the board out and this area looks clean, then the most likely problem becomes your lcd connector job—you have bad joints.

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Thanx. Actuality i took the board out, but i get why you would think i didn't;) i did the connctor job in winter time so my ultrasonic cleaner was separated to me by 500m3 of snow (Norway)

My joints seems to connect under the microscope, but i'll do a continuity test to be sure.

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not continuity--do a diode mode test. red probe on ground and black probe in the connector. At the bottom of the connector on the side closest to the battery are the backlight anode and cathode lines. None of these should be short or OL. One of yours is. Find it.

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Hi Jessa,

The diode test was good! Also the joints seems good!

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Split the screen to see if your problem is image or backlight. Also--please tell me you are using a known good screen and not the water damaged screen.

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I am using a known good screen. When i get home button reaction i try to touch random numbers to see if I get “wrong passcode” vibration, but I don’t.

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