# LG OLED fuse blows / overvoltage trip

> LG OLED blows a fuse on power-on or overvoltage / RCD trips? Often a short on the PSU input. Safety, triage and AmparioWeb help.

## In short

Two related searches meet the same risk: **fuse blows on power-on** and **overvoltage protection trips** (or the **RCD** / residual-current device trips). Both mean excess or fault current — often already at the **PSU** input.

This is **not** harmless standby clicking. Re-applying power after a tripped fuse or RCD can worsen damage and fire risk. Unplug, find the cause — do not keep trying.

## Fuse vs RCD vs surge protection

A **device fuse** on the PSU or a **house breaker** protects against overcurrent. An **RCD** reacts to earth fault current. **Surge protection** (SPD / MOVs) can trip on mains spikes or fail short.

Note *which* protector trips and whether it happens **only when the TV powers on**. That drives triage — often the **PSU** primary stage.

- Fuse / RCD only when TV powers on → device / PSU first
- Several loads affected → more installation / surge event
- Burn smell, soot, bulged parts → do not keep running
- After lightning, dead set + tripped protection → have input/protection parts checked

## Why often the PSU?

The **PSU** primary has rectifiers, filters, fuses and protection parts. A short, failed MOV or punched-through capacitors can throw the house or device fuse immediately.

Related symptoms without an instant fuse trip: [won't turn on](/en/blog/lg-oled-fernseher-geht-nicht-mehr-an), [clicks twice](/en/blog/lg-oled-klickt-zweimal-geht-aus), [red LED blinking](/en/blog/lg-oled-rote-led-blinkt). Board swap: [replace PSU](/en/blog/lg-oled-netzteil-platine-tauschen).

## Safety notice

**Lethal hazard.** After a tripped fuse or RCD, do **not** re-energise “to test”. **Discharge electrolytics** before opening. Primary-side work is for specialists only.

Unsure? Leave it unplugged and book [Repair](/en/reparatur).

## What you can do (no live work)

Triage only:

- Unplug; check other loads on the same breaker
- External burn/melt marks on cable or chassis?
- Note model and board numbers — [Find number](/en/nummer-finden)
- Do not uprate the fuse or bypass the RCD

## When AmparioWeb helps

With fuse / surge trips tied to the TV, PSU inspection and a **tested** board swap often make sense. AmparioWeb supplies [Parts](/en/bauteile) and fixed-price [Repair](/en/reparatur).

## FAQ

**Replace the fuse and keep watching?**

Only after finding the cause. A new fuse that blows again confirms a short — take the set out of service.

**Is the RCD “too sensitive”?**

Sometimes an installation topic — but if only the LG OLED trips it, suspect the set first; do not disable the RCD.

**Can surge kill the PSU?**

Yes. After spikes, input protection and the primary stage are typical victims.

**Panel or PSU?**

Instant fuse/RCD trip on power-on strongly points to the **PSU primary**, not the panel.

**Next step with AmparioWeb?**

[Find number](/en/nummer-finden), then [Repair](/en/reparatur) or tested [Parts](/en/bauteile).