Bench Signal #012 — three things from the bench, every Tuesday.
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① This week's tip
iPhone that's been dead for weeks, plugged into a charger, and shows nothing at all, not even the charging screen. Before condemning the battery or the charging IC, try a bench power supply at 3.8-4V, current limited to around 1A, directly on the battery connector for 10 to 15 minutes.
A battery left fully discharged for long enough can drop below the voltage the charge controller expects to see before it'll start a normal charge cycle. A slow, direct wake-up is often enough to bring it back into range. Reconnect to a normal charger afterward and test properly.
Ten minutes on the bench supply before you order a new battery.
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② Prompt of the week
Use this to put a diagnostic fee policy into writing everywhere you need it, worded consistently:
I run an independent Apple repair lab and I'm switching from free diagnostics to a €20 diagnostic fee, credited toward the repair if the customer proceeds. Write three versions of this policy: one line for the website (formal, reassuring), one for a printed counter sign (short, direct), and one spoken script I can say at intake (plain, confident, no apology). Keep the core message identical across all three: what it costs, that it's credited if they go ahead, and what they get for it.
Update the website first, then the sign, then start saying it out loud.
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③ Resource this week
Wave — waveapps.com
Free invoicing and accounting tool. Useful if you're introducing a diagnostic fee and need a clean way to invoice it, credit it toward the final repair, and keep a paper trail without adding a paid subscription to your stack.
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That's it for this week.
If this was useful, forward it to a colleague who'd appreciate it.
— BenchNotes