TV Power Issues

Won't Switch On — Standby & Power-Supply Faults

A TV that won't switch on is one of the most common faults we fix — and one of the easiest to misdiagnose if you don't know what you're looking at. The vast majority of "dead" TVs are simply power-supply (PSU) board faults: failed capacitors, blown mosfets or burnt-out standby sections.

These are bench-level repairs that we complete same-day, with parts in stock for most major brands. We diagnose with the actual PSU board out of the chassis — no guesswork, no replacing parts that don't need replacing.

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TV power-supply (PSU) board repair on a Silman TV Repairs workbench

Common Causes

What's Causing The Power Fault

Every "dead TV" we see traces back to one of these. Most are same-day repairs.

Bulging or failed capacitors

The single most common PSU fault. Visible bulging from the top of electrolytic capacitors — replaced on the bench.

Standby light flashing pattern

Brand-specific blink codes tell us exactly which rail or section has failed. We decode them on diagnosis.

Switches on then off again

Protection circuit triggering — usually a short on a rail or a backlight inverter feedback fault.

Completely dark, no LED

Mains fuse, primary mosfet or standby converter section. Bench diagnosis confirms the exact fault.

Clicking sound, no startup

PSU oscillating because it can't hold a rail under load. Usually a failed cap or mosfet.

Power LED on but TV unresponsive

PSU is healthy, mainboard is the culprit. Less common but absolutely repairable.

Replacing failed capacitors on a TV power-supply board — Blown capacitors and dead power boards rebuilt at component level — the most common "won’t switch on" fix.

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