Repair assistant
A calm fault-finding checklist.
Use this as a structured repair guide for low-voltage electronics, speakers, small audio gear, and learning circuits.
Safety first, always.
ElectroLab AI teaches theory, low-voltage electronics, and planning concepts. Mains voltage, switchboards, fixed wiring, high-current systems, and legal electrical work must only be performed by licensed electricians where required.
Open Safety CenterDiagnostic flow
1.Confirm the exact symptom: dead, intermittent, noisy, weak output, overheating, blown fuse, or physical damage.
2.Ask what changed before the fault: drop, water, wrong adapter, reversed polarity, overload, new part, or long storage.
3.Inspect before powering: smell, heat marks, cracked solder, loose connectors, swollen capacitors, burnt resistors, torn speaker leads.
4.Power safely with the lowest-risk source: battery, current-limited bench supply, or isolated low-voltage adapter.
5.Measure supply rails first, then inputs, controls, driver stages, and outputs.
6.Change one thing at a time and write down the result so the fault path stays clean.
No power
Battery or adapter voltage
Switch and fuse continuity
Reverse polarity protection
Input connector damage
Gets hot
Current draw
Shorted output part
Wrong supply voltage
Coil or motor resistance
Audio fault
Speaker continuity
Input jack and ground
Volume pot pins
DC on speaker output
Intermittent
Loose socket
Cracked solder joint
Broken wire strand
Switch contact wear
Measurement order
Voltage present at source
Voltage present after switch or fuse
Ground continuity
Expected regulator output
Signal reaches input stage
Output changes when input changes
Stop here if
Mains voltage, switchboards, fixed wiring, and high-current systems belong with licensed electricians where required.
If a fuse blows repeatedly, stop replacing it and find the cause.
If a lithium battery is swollen, hot, punctured, or smells unusual, isolate it safely and do not charge it.
If you cannot identify the power source or stored-energy parts, pause before probing.