# LG OLED trips the fuse on power-on

> LG OLED trips the breaker or RCD when turning on? Often a PSU primary short. Safety, high-level diagnosis and AmparioWeb help.

## In short

If the **breaker** or **RCD** (residual-current device) trips when you **power on** the LG OLED, there is often a **short in the PSU primary** — not a “too sensitive” RCD.

This is **not** harmless standby clicking. Unplug, do not re-energise “to test”, and never bypass the fuse or RCD. AmparioWeb can help with tested **PSU** repair or board swap.

## Symptom: fuse or RCD trips on power-on

Typical: you turn the set on — and **immediately** or within seconds the **circuit breaker** or **RCD** in the consumer unit trips. Sometimes an on-board device fuse blows; from outside you mainly notice the circuit going dark.

Key check: does protection trip **only** when this LG OLED powers on? Then the set is suspect #1. If several loads trip together or without the TV, call an electrician for the installation.

- Only when the TV powers on → device / PSU primary first
- Several outlets / loads affected → have the house wiring checked
- Burn smell, soot, hot outlet → take the set out of service
- Repeated reset-and-retry increases damage and fire risk

## Why often the primary and the PSU?

The **PSU** **primary** holds rectifiers, mains filters, protection parts and often the device fuse. A short there draws overcurrent or earth-fault current — the house fuse or RCD reacts before picture or sound appear.

Related symptoms **without** an instant trip: [won't turn on](/en/blog/lg-oled-fernseher-geht-nicht-mehr-an), [clicks twice](/en/blog/lg-oled-klickt-zweimal-geht-aus), [Carli capacitors](/en/blog/lg-oled-carli-kondensatoren). Board swap: [replace PSU](/en/blog/lg-oled-netzteil-platine-tauschen). Generic LG PSU numbers often follow **EAY…** — read them from the board, do not invent them.

## Safety — never bypass RCD or fuse

**Lethal and fire hazard.** After a trip, do **not** re-energise the set. **Never** disable or bridge the RCD or fit a “stronger” fuse so the TV “works again”. The protector did its job.

**Unplug** the TV. If house wiring, outlet burn marks or unexplained RCD trips are involved: call an **electrician**. Primary-side PSU work is for specialists only; electrolytics can hold charge.

## Vs overvoltage and storms

This article focuses on **fuse / RCD trips on power-on**. For storms, mains spikes or surge protectors — or if you are unsure which device tripped — see [LG OLED fuse / overvoltage](/en/blog/lg-oled-sicherung-ueberspannung).

Rule of thumb: **only** when this TV powers on → stay on the device/PSU path. After lightning/surge, dead set + tripped protection → input/protection stage, covered in the surge article.

## High-level diagnosis (no live work)

Goal: separate set vs installation and note the **EAY** / board number — do not “try until it sticks”.

- Unplug; check other loads on the same breaker/RCD circuit
- Note: breaker, RCD or both — and only with this TV?
- Externally: burn/melt marks on cable, plug, chassis?
- Note model and board number (often **EAY…**) — [Find number](/en/nummer-finden)
- No live opening, no RCD/fuse bypass, no uprated protection

## Help from AmparioWeb

If the set is the suspect (trip only when this LG OLED powers on), AmparioWeb typically inspects the **PSU** input/primary and offers fixed-price [Repair](/en/reparatur) or a **tested** board via [Parts](/en/bauteile).

Start: [Find number](/en/nummer-finden) → then repair or matching board. Do not blindly fit untested used boards while a short is unconfirmed.

## FAQ

**Can I disable the RCD briefly to test?**

No. RCD and fuse protect against fire and shock. Bypass is dangerous and not allowed. Unplug and find the cause.

**Is the RCD too sensitive?**

Sometimes an installation topic — but if **only** this LG OLED trips it on power-on, suspect the set/PSU first; do not “desensitise” the RCD.

**Panel or PSU?**

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

**Difference from the surge article?**

Here: symptom **on power-on**. Overview fuse + surge/storm: [fuse / overvoltage](/en/blog/lg-oled-sicherung-ueberspannung).

**Next step with AmparioWeb?**

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