7 sourced reports, with what to check before you buy. Each one links to the page it was reported on.
Costly or dangerous
After a system update LG OLED48C1 developed horizontal lines and repeated shutdowns
Reclame Aqui consumer complaint: an OLED48C1 that worked until November 2025 developed horizontal black lines across the image and sudden continuous shutdowns after a system update; the authorized LG repair quote (R$ 5,790) exceeded the TV's original price (R$ 4,107).
What to check. A C1 that develops horizontal lines and repeated shutdowns after an update can be expensive to repair — one owner's authorized repair quote exceeded the TV's purchase price.
LG C1 burn-in after long static image; Pixel Cleaning did not remove it
Hardware.com.br article: a 55" LG C1 owner left a Fire TV static home screen on overnight and found a large visible mark; Pixel Cleaning did not remove it. The article cites RTINGS' accelerated long-duration test in which a C1 showed permanent retention in static-element regions after thousands of hours of repetitive content.
What to check. Burn-in on the C1's OLED panel is cumulative and permanent; a single static image left on can reveal it, and the built-in Pixel Cleaning may not remove it. Static content should be avoided for long periods.
LG C1 random restarts under gaming load — LG cites possible mainboard/power-supply overheating
German owner forum (EU market): the C1 restarts by itself under high load during gaming on both PS5 and Xbox Series X; LG's own reply to the owner suggested a possible overheating problem on the mainboard or power supply. A forum member notes the LG exchange program for power-supply faults covers only 2016-2019 models, so the C1 is not covered by it.
What to check. If a C1 restarts only under gaming load, suspect the mainboard or power supply rather than the cable or firmware; this is a hardware fault not covered by LG's older power-supply exchange program.
Firmware 03.41.05 broke Wi-Fi streaming apps, power control and Bluetooth on C1
Russian webOS forum aggregating Reddit reports on firmware 03.41.05: after the update the C1's Wi-Fi connects but all streaming apps stop working, power on/off becomes unreliable, and Bluetooth pairing fails; users advise not installing the update.
What to check. Firmware 03.41.05 is reported to break Wi-Fi streaming apps, power control and Bluetooth on the C1; owners advise against installing it.
Firmware 03.53.45 update caused black-screen startup loop on LG C1 65"
Spanish forum (EU market), LG C1 65" 2021 on firmware 03.53.45: about 28 seconds after power-on the TV shows an update screen and then goes fully black, requiring a power-off/on; the owner solved it with a factory reset, which also added new settings options.
What to check. On firmware 03.53.45 a C1 can fall into a black-screen update loop at startup; a factory reset (advanced reset) is reported to resolve it, at the cost of reconfiguring the TV.
LG C1 power cycles when a bright game flash appears on screen
TechRadar/Yahoo news report: a bright muzzle flash in Resident Evil Requiem caused an LG C1 to power-cycle (turn off and back on); the report notes the cause is unclear, either a power unit failure or a panel problem, and that no obvious fix exists yet.
What to check. A C1 that shuts off and restarts on bright on-screen flashes points to a power-supply or panel fault; owners report no reliable fix, only workarounds like dimming or changing HDMI cable.
OLED65C1 screen goes black with an update logo seconds after power-on
French Darty SAV community (EU market), OLED65C1: seconds after power-on the screen goes black and shows an update logo; a second certified owner confirms the same problem and says a factory reset did not fix it ("J'ai réinitialisé la tv").
What to check. A C1 that shows an update logo and black screen shortly after power-on may not be cured by a reset; owners report it recurring after every power cycle.
These reports come from the pages linked under each item: owner forums, repair guides and workshops. They are not a diagnosis of any one unit, and a careful check of the one you are buying still applies.
Text from the Kriko Televisions catalog, version 0.1.1, under the CC-BY-SA-4.0 license.
