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Repair information and guides for the fifth generation of iPhone. Model: A1387

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iPhone 4S No Backlight Issue

I have an old iPhone 4s that has no backlight, but if I hold it in light I can see the LCD working. I have tried restoring in iTunes and replacing the screen. There is gunk on the capacitors near the display cable so could that be it? If so, how can I remove it without knocking the components off the board? The previous owner had it sitting in a closet for years, so dust and gunk could have accumulated then.

EDIT: I don’t know what I did, but now the backlight turns on for a second showing the Apple logo, but then turns off again and won’t illuminate

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could be a bad backlight filter

Update (04/20/24)

check that filter for continuity

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How could I fix that?

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@braydendcooper it requires microsoldering equipment its not an easy repair for just anyone. have you got a multimeter

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Yes, I do have one

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@tech_ni the filter has no continuity.

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Brayden Cooper crwdns2934231:0crwdne2934231:0
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