The Apple iPhone 5s was announced on September 10, 2013. Repair of this device is similar to the previous models, and requires screwdrivers and prying tools. Available as GSM or CDMA / 16, 32, or 64 GB / Silver, Gold, and Space Gray.

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Low Display Brightness After Replacing Battery

I just replaced the battery in my iPhone 5S.

Accessing and replacing the battery was straightforward. Getting the touchscreen and display to work properly afterwords has been difficult. I lost track of how many times I connected / disconnected / reconnected the three small rectangular connectors in the upper right part of the phone. After multiple attempts I got the lines in the display to go away and the touchscreen to work properly.

I have two unresolved but related issues.

1. Un-even display backlighting brightness on the left side and near the top.

2. Brightness of the whole display is low compared to before dis-assembling the phone.

I suspect one of the three connectors is still not properly installed. I am reluctant to take the phone apart again.

Just looking to confirm my suspicions.

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1 Answer

Chosen Solution

When you originally re-assembled your phone, was the battery disconnected prior to re-connecting the LCD and Digitizer flex connectors?

Sometimes this can cause the backlight circuit to fail. There is a single line (anode) going to power the backlight but 2 return lines (cathode). If the display is dim on only one side, it could be caused by a failed filter on one of the cathode lines.

Of course, it could just be an improperly connected connector...sometimes they're a pain to align correctly.

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I'm pretty sure I disconnected the flex cables with the battery connected at least once if not more than once.

I'm going to try re-connecting the connectors one more time but I strongly suspect I fried a filter.

Thanks for your helpful reply.

Best Regards,


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Jonathan Fox will be eternally grateful.
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