Visually inspect power board capacitors on a Hisense TV by first unplugging the unit, waiting 10 minutes for discharge, then removing the back panel screws to access the board.

Safety Before Inspection

Lay the TV face-down on a soft surface to protect the screen. Discharge large capacitors by bridging their terminals with an insulated screwdriver (wear gloves)—sparks indicate stored charge release. Avoid touching other components to prevent shocks or static damage.

Use good lighting or a phone flashlight; magnification glasses help spot subtle issues on dense Hisense boards.

These bulging electrolytic capacitors show classic failure signs, with domed tops and corrosion around bases, common on power supplies after Nairobi surges.

Bulging and Swelling Signs

Healthy electrolytic capacitors (tall cylinders, often black or silver) have flat or slightly concave tops. Failures bulge upward like a dome from internal gas pressure due to electrolyte breakdown—over 80% of power issues stem from this.

Check all sizes, especially 400-1000µF ones near heatsinks; even mild doming predicts imminent shorting.

Leakage and Residue Detection

Look for brownish, crusty residue seeping from the top vent or base—dried electrolyte corrodes nearby solder joints, causing intermittent power. Discoloration on the PCB (darkened copper) or glue confirms acid attack.

Wipe gently with isopropyl alcohol; persistent stains mean replacement needed.

Cracks, Burns, and Deformation

Scan for cracked casings, scorch marks, or melted plastic from overheating. Bent or loose leads signal vibration damage; corroded pins prevent voltage delivery.

Compare neighbors: Uniform good caps highlight outliers. Burnt smells during prior use reinforce visuals.

Failure Sign	Appearance	Risk Level
Bulging top	Domed/convex surface	High—immediate fail
Electrolyte leak	Brown crust/residue	High—corrosive
Cracks/burns	Splits, char marks	Medium—short risk
Loose leads	Bent, oxidized terminals	Low—connection fix

Confirmation and Next Steps

Visual fails confirm board-level repair at Luthuli shops like TV Repair Kenya (0101 763 173)—desoldering/replacing costs KSh 3,000-6,000. Good visuals warrant multimeter tests for ESR or capacitance before service.

Snap photos of suspects; techs use them for instant quotes. Annual dust cleaning prevents recurrence in humid Kenyan conditions.