What it means
Internal pressure can deform the top or open a safety vent. Heat, electrical stress and ageing may contribute, but a photograph cannot identify the whole circuit fault. Some failed capacitors show no swelling. Replacement requires checking polarity, ratings and the reason for failure. Mains equipment can retain dangerous charge after unplugging; opening a power supply is not an ordinary inspection task.
How this affects everyday use
High temperature, unsuitable voltage, excessive ripple or degradation can damage capacitors and nearby circuitry.
A practical example
An older motherboard intermittently fails to start and has a raised capacitor top with nearby residue.
What to check
- Inspect only safely accessible unpowered parts without touching leakage.
- Record the model and photograph visible damage for a qualified repairer.
- Note symptoms and heat damage affecting surrounding components.
Practical next steps
- Stop using equipment with visibly leaking or deformed components.
- Have a qualified technician assess the circuit and repair suitability.
- Replace the approved complete assembly when board repair is unsafe or impractical.
Keeping it reliable
Maintain ventilation and suitable power equipment. Do not puncture capacitors, improvise discharge or open mains power supplies; appearance alone cannot certify electrical safety.