What Our Free Phone Diagnostic Actually Checks

Every repair shop advertises a free diagnostic, and every customer quietly wonders the same thing: free, but what's the catch? Fair question. The most useful answer we can give isn't a slogan — it's the actual checklist. So this article publishes what our technicians check, in order, why each item is on the list, and the honest business logic of why it costs you nothing.

First, the Honest Part: Why Free?

No mystery, no catch — it's conversion math, and we'd rather say so out loud. A diagnostic takes a technician about 30 minutes. Some of those diagnostics turn into paid repairs; enough do that the free ones are covered. From your side of the counter, that means three things:

• The quote comes after the inspection, not before. We're pricing what's actually wrong, not what the symptom sounds like over the phone.
• Repair or don't — genuinely your call. No diagnostic fee means no sunk cost pressuring you into a repair. If the honest answer is "this isn't worth fixing," we say that, because a customer who trusts the no comes back for the next yes.
• You leave with information either way. A written finding of what's wrong has value even if you fix it elsewhere, use it to negotiate a trade-in, or decide to upgrade.

That's the whole trick. There isn't one.

The 22-Point Checklist

Here's what actually happens on the bench, grouped the way we work through it.

Exterior and structure

1. Frame and housing — bends, drop dents, gap between frame and screen (a bent frame changes what repairs are even possible)
2. Screen glass condition — crack mapping, chips at the edges that will spread
3. Back glass and camera lenses — damage that's cosmetic today can let dust and moisture in tomorrow
4. Liquid contact indicators — the moisture-triggered stickers in the SIM tray and internals that reveal water exposure you may not know about

Display and touch

5. Display panel — dead pixels, lines, burn-in, discoloration on solid-color test images
6. Touch response — a full-screen drag test to map dead zones and ghost touch
7. Brightness and auto-brightness — panel output and ambient light sensor behavior

Power and charging

8. Battery health reading — actual capacity percentage pulled from the battery controller, not a guess (here's how to read it yourself)
9. Cycle count and battery age indicators — how hard the battery has lived, which predicts how it will behave
10. Charging port inspection — lint compaction, bent contacts, corrosion under magnification (most "broken port" cases are actually compacted lint)
11. Wired and wireless charging test — confirmed with a known-good cable and pad, so a bad accessory can't masquerade as a bad phone

Cameras

12. Rear cameras — focus, stabilization rattle, dark spots from internal dust on every lens
13. Front camera and face unlock hardware — selfie camera plus the sensor cluster that drives Face ID or the fingerprint reader

Audio

14. Earpiece speaker — call audio clarity at multiple volumes
15. Loudspeaker — distortion and crackle at max volume
16. Microphones — all mics tested separately (phones carry three or more; only one failing explains "they hear me on speaker but not normally")

Connectivity

17. Wi-Fi — scan, connect, and hold a network
18. Bluetooth — pairing and stable connection
19. Cellular and SIM — signal registration, SIM detection, call test

Sensors, buttons, and board

20. Buttons and haptics — power, volume, mute switch, vibration motor
21. Motion and proximity sensors — the screen-off-during-calls sensor, rotation, compass
22. Logic board visual inspection — when opening the device is warranted: corrosion bloom, previous repair work, connector damage under the microscope

Not every device needs all 22 — a phone that won't power on starts at a different place entirely (see what we check when an iPhone won't turn on) — but this is the standard sweep for a working device with a complaint. iPads, MacBooks, and consoles get the equivalent list adapted to their hardware; everything we service is on the services page.

Why the Full Sweep, Not Just Your Complaint?

Because symptoms lie, and because surprises after a repair are worse than surprises before one. Two real patterns from the bench: a "battery problem" that's actually a failing charging port throttling intake, and a "screen problem" that's a bent frame pressing the panel — replace the screen without addressing the frame and the new screen dies in a month. The checklist exists so the quote covers the cause, and so you hear about that marginal battery before you approve a screen repair, not as an upsell call afterward.

It also protects both sides: the pre-repair condition of everything is documented, so there's never a debate about whether the camera worked when the phone came in.

What We Don't Do During a Diagnostic

A checklist of what happens is only half the transparency; here's the other half. During a standard diagnostic we don't remove parts, don't install anything, don't update or modify your software, and don't touch your files — the tests above are observational, run through the operating system and our bench instruments. Nothing is disassembled without telling you first, and nothing about the diagnostic changes your device's condition or its standing for any other repair path you might choose later, including a manufacturer one. The phone you hand us is the phone you get back, plus a written diagnosis — that's the entire transaction.

After the Checklist: How the Quote Works

The flow is deliberately boring:

1. Technician walks you through the findings — plain language, showing you the readings.
2. You get a written quote for what needs fixing: parts, labor, and time. Prices match our published rates.
3. If something is not worth fixing, we say so and put a number on the alternative math (repair vs. trade value vs. replacement).
4. You decide. Repair now, think about it, or take the phone home — no fee, no restocking-your-own-phone charge, no attitude.
5. If you proceed, the repair carries our 90-day parts-and-labor warranty, and the checklist gets re-run on the repaired device before pickup.

Wondering whether an independent-shop repair affects your manufacturer coverage? Short answer: federal law protects you — the long answer is in our warranty myths explainer.

Walk-ins work at all nine stores — including Arcadia — Huntington and Monterey Park — or book a slot online and the bench is ready when you arrive.

FAQ

How long does the diagnostic take?

About 30 minutes for the standard sweep on a working device. No-power devices, liquid damage, and board-level suspects take longer because they start with disassembly — we'll give you a time estimate up front and can text you the findings if you'd rather not wait.

Is it still free if I don't repair with you?

Yes. That's the entire premise. You're welcome to take our written findings and quote anywhere — the number of people who come back after comparing is, candidly, why the model works.

Do I need to unlock my phone for the diagnostic?

For the full 22 points, yes — touch, cameras, speakers, and sensors can only be tested from inside the OS, and battery health readings need the settings screen. If you'd rather not share a passcode, tell us: we'll run the hardware-observable subset and you can demo the rest in person at the counter. More on how we handle device access in our data safety during repair guide.

Will you open my phone during a free diagnostic?

Only when the symptom requires it (liquid exposure, no power, suspected internal damage) and we'll tell you before we do. The routine 22-point sweep is non-invasive.

Can you diagnose a phone that won't turn on at all?

Yes — that's a different track: bench power supply, current-draw reading, and board inspection instead of the OS-based tests. It's the diagnostic where professional equipment matters most, and it's still free.