In short
If your LG OLED clicks in standby — seemingly “off” but making soft switch noises at odd times — that is not automatically a total failure.
Many series still run maintenance after power-off: pixel cleaner / pixel refresh and related standby jobs. That can cause short relay-like sounds. Separately, true power supply board instability produces clicking without a sensible maintenance context, often with start problems.
Maintenance vs power supply board — rough split
Maintenance clicks are often time-bounded (after long use, after power-off, in known refresh windows) and the set starts normally afterward. It becomes concerning when clicking feels chaotic, comes with failures, or boot becomes unreliable.
More on burn-in and pixel cleaner: burn-in & pixel cleaner. If it later won't turn on or only clicks: won't turn on and clicks twice and turns off. Shuts off while running: turns itself off.
- Short click soon after power-off — often maintenance
- Irregular clicks for hours without context — investigate
- Clicking + later no picture / blink code — more supply-related
- Pixel refresh aborts or never starts — often power supply board stability
Why the power supply board matters in standby
Standby and auxiliary rails must stay stable even when “off”. Aging power supply board parts can collapse exactly when maintenance draws load — users hear clicks and later see boot failures.
Timer sockets that cut mains entirely can block maintenance — see our timer-socket / pixel-refresh article.
Safety notice
Mains voltage is lethal. Opening the set and working on the power supply board means dangerous voltages. Discharge electrolytics, never work under power.
Unsure? Unplug, do not open, use a workshop / AmparioWeb.
The large electrolytic capacitors can still hold up to about 400 V after switching off. After unplugging, wait at least 2 hours, measure with a range of at least 600 V and only continue once the voltage is below 30 V if possible.
What you can check
Observation only, no live work:
- When exactly does it click?
- Does the set still start reliably afterward?
- Any blink codes or dead starts?
- Note model / board numbers — Find number
When AmparioWeb helps
If clicking comes with start problems, self-shutdown or no picture, power supply board diagnosis pays off. AmparioWeb supplies tested parts and fixed-price repair.
Frequently asked questions
- Is standby clicking normal?
- Short, context-linked clicks after power-off can belong to pixel refresh / maintenance. Chaotic or fault-linked clicking usually does not.
- Can I disable the pixel cleaner?
- Menus differ by series. Permanently blocking maintenance raises burn-in risk — see burn-in & pixel cleaner.
- When is it the power supply board?
- If clicking comes with start-up problems, think of the power supply board. If the standby LED blinks or the relay clicks when switching on, the fault can be on the power supply board, but it does not have to be. If the TV switches itself off after a while, the standby LED then stays red and every attempt to switch on clicks, experience shows the mainboard is faulty.
- Does unplugging help?
- It interrupts maintenance and soft-start. Not a lasting fix; real power supply board faults return.
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Power boards for LG OLED — tested under load, 12-month warranty.
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