Weird iPhone Problems

Here is a summary of weird iPhone problems I've personally seen, and suspected cause:

iPhone 4S Unreliable WiFi (WiFi function not available)
Diagnosis: logic board fault. Potentially requires logic board re-work or replacement.
Thoughts: Perhaps caused by a drop.

iPhone 5 Volume Buttons Don't Function
Diagnosis: logic board fault (and not the buttons or its cable). Potentially requires logic board re-work or replacement.
Thoughts: misbehaving aftermarket charger put out high voltage, damaging logic board.

iPhone 6 GPS doesn't work well (or at all).
Diagnosis: GPS antenna needs reseating and/or replacement. I recently fixed this by merely reseating the antenna assembly.
Thoughts: Perhaps caused by a drop, or just random.

iPhone 6S cell service gives no signal.
Diagnosis: cell circuitry dead on logic board. Potentially requires logic board re-work or replacement.
Thoughts: Perhaps damaged by hard drop.

iPhone 7 bad audio circuit.
Diagnosis: logic board fault. Potentially requires logic board re-work or replacement.
Thoughts: Perhaps caused by a drop.

iPhone 8 cell service fully broken, seems non-existent
Diagnosis: cell circuitry dead on logic board. Potentially requires logic board re-work or replacement.
Thoughts: Perhaps damaged by hard drop.

Other issues I've seen:
1. Smashed display glass (all models)
2. Abused/Ruined TouchID button (iPhone 6)
3. Bent / Distorted Housing (iPhone 5S)
4. Linted-filled Lightning Port (all Lightning models)
5. Weak battery (any older or misused device)
6. Bad home button (iPhone 4)
7. Smashed back (iPhone 4,4S,8)
8. Bad knock-off charger cables (all models)

Phone models I have worked on:
iPhone 3G,3GS,4,4S,5,5C,5S,6,6S,7,8

Phone models I have never worked on:
Original,SE,X,XS,11,11Pro, any "Plus" model, any "Max" model.

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The Lance J. Technoweb

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