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Repair information and guides for the Apple iPhone 5c that was announced on September 10, 2013. Model: A1532, A1456

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LCD working, but Digitizer not, how do I diagnose?

I have replaced the LCD/Digitizer assembly 2x on my iPhone 5c. In both cases I have had the following result:

the LCD works. I can see the screen. The home button functions when pressed allowing me to see the apps and, for the lack of a better word, the dashboard. The touch function does not work despite being able to see everything. Additionally, after the screen times out and I reactivate it; the screen starts out dark and then lightens as it “fully engages” for the lack of a better phrase.

I attempted reseting via iTunes and was successful; however, this did not fix my digitizer issue or the screen lightening issue the latter being perhaps a minor issue.

I talked with a phone repair techs at one of those phone repair booths and they mentioned that what could have happened is that the battery could have sent a charge through the motherboard and shorted the digitizer. I am unsure if he meant the LCD/Digitizer assembly or the digitizer part on the motherboard.

So now I am at the diagnosing stage. I think the cost of having them diagnosing is roughly $30, I was unable to listen completely as I was carrying my toddler. BUT how would I do the diagnosing? How can I figure out what is wrong with my phone?

Should I just attempt another LCD/Digitizer assembly, if that doesn’t work though what then? how can I trace the problem?

Answered! View the answer I have this problem too

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It’s either 2) a bad screen or b) a logic board issue.

The only way to know for sure is to install a known-good screen to see if it solves the problem or not. In the absence of a known-good screen, one purchased from a reputable supplier. Most phone shops will probably do this for free as it only takes a few minutes. If the screen fixes the issue, then thank them by having them replace it it completely.

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so I cleaned the connections and re-seated the connectors, still no good. Guess the next step is replace the logic board...

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You have to eliminate the screen as a possibility before replacing or repairing a logic board. Just re-seating the connectors still leaves the possibility of a bad replacement screen. Granted, after 2 screens the issue is probably elsewhere but ideally you need a known-good screen or another working device to test your screens on.

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Try reseating the display cables first. If that doesn’t work, try cleaning the connector with alcohol and cotton swabs. Or, try using another display assembly. Hope this helps!

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