P05
LG Smart TV
Severity: CriticalWhat Does This Error Mean?
P05 on an LG TV means the power board is not supplying stable voltage to the main processing board. The TV may refuse to turn on, restart in a loop, or shut itself off shortly after starting. This is a hardware fault requiring professional repair — the power board needs testing or replacement.
Affected Models
- LG OLED C3
- LG QNED85
- LG UHD 75UP8770
- LG NanoCell 90
- LG OLED evo G3
Common Causes
- Power board capacitors have swollen or failed due to age
- A power surge has burned out a voltage regulator on the power board
- Loose or damaged power board connector to the main board
- Faulty wall outlet or extension cord delivering unstable mains voltage
- Internal short circuit on the power board caused by dust or moisture ingress
How to Fix It
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Unplug the TV completely from the wall and leave it unplugged for 2 full minutes.
This drains residual charge from the power board and can sometimes clear a temporary P05 caused by a voltage fluctuation.
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Try plugging the TV directly into a different wall outlet — not via an extension cord or surge strip.
A faulty extension cord or overloaded power strip can cause unstable voltage that triggers P05 — rule this out first.
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Power the TV on and observe — if it starts normally, monitor it for the next hour.
If P05 does not return, the fault was likely a temporary voltage issue. If it returns within an hour, the power board needs repair.
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Check the TV's warranty at lg.com/us/support using the serial number from the back label.
Power board failures within the warranty period are covered — always verify before spending money on a repair.
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Contact LG support at 1-800-243-0000 and report error P05 for a repair referral.
Out-of-warranty repairs can be handled by LG-authorised service centres who have access to genuine replacement boards.
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If out of warranty, ask the technician specifically about capacitor replacement versus full board swap.
Replacing swollen capacitors costs far less than a new power board — a good technician will offer both options.
When to Call a Professional
P05 is a power board fault that requires the TV to be opened and tested with a multimeter. A technician can identify whether the board needs replacement or just a capacitor swap, which is cheaper. Do not attempt to open the TV yourself — the power board stores dangerous charge even when unplugged.
Frequently Asked Questions
Is it safe to keep trying to turn on my LG TV while it shows P05?
It is not recommended — repeatedly power cycling a TV with a failing power board can cause further damage. Turn it off, unplug it, and arrange a repair before using it again. The power board stores charge that can be dangerous if the TV is opened without proper discharge.
Could a power surge have caused P05 on my LG TV?
Yes — power surges are one of the most common causes of P05. A sudden spike in mains voltage can burn voltage regulators or blow capacitors on the power board. Always plug your TV into a quality surge protector to prevent this in future.
How much does LG TV power board repair typically cost?
Capacitor replacement (if that is all that failed) costs $50–$100 in labour. A full power board replacement typically costs $100–$250 depending on the TV model. Get a quote from an LG-authorised centre — they use genuine parts and the repair comes with a warranty.