LG OLED trips the fuse on power-on

In short

If the breaker or RCD (residual-current device) trips when you plug in or power on the LG OLED, there is often a short in the power supply board's primary — not a “too sensitive” RCD. Rule of thumb for the house fuse: if it trips as soon as the TV is plugged in or switched on, the cause is always the power supply board. Exceptions are possible. If in doubt, call in a TV technician. The rule is only meant as a rough classification.

This is not harmless standby clicking. Unplug, do not plug in or switch on again “to test”, and never bypass the fuse or RCD. AmparioWeb can help with tested power supply board 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. The house fuse can trip as soon as the mains plug is plugged in, not only when switching on.

Key check: does protection trip only when this LG OLED is plugged in or 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 is plugged in or powers on → device / power supply board 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 power supply board?

Power supply board EAY65689423 (65 inch), removed. Block 1 at the front with device fuse F100, ICL and 4-MOSFET block, block 2 at the back with fuse F801 and 2-MOSFET block.

The power supply board's 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, clicks twice, Carli capacitors. Board swap: replace power supply board. Generic LG power supply board 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. Opening the power supply board (primary side) 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.

Rule of thumb: only when this TV is plugged in or powers on → stay on the device/power supply board path. After lightning/surge, dead set + tripped protection → input/protection stage of the power supply board, 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
• 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 is plugged in or powers on), AmparioWeb typically inspects the input/primary stage of the power supply board and offers fixed-price Repair or a tested board via Parts.

Start: Find number → then repair or matching board. Do not blindly fit untested used boards while a short is unconfirmed.