Tv turns on and shuts off immediately
LG C1 OLED55C1PUB won’t power on — relay clicks but no picture. Any ideas?
I have an LG C1 55” OLED, model OLED55C1PUB, manufactured 03/2022. It stopped working a few months ago and I’m trying to figure out which component has failed before I start ordering replacement boards.
Symptoms:
TV has a red standby light.
When I press power, the red light flashes.
I hear a distinct relay click from the white power-supply board.
The TV then does nothing.
OLED panel never lights up or flashes.
No picture or normal startup.
I’ve tried unplugging it, letting it sit, and doing a power reset.
I’ve disconnected external HDMI/USB devices.
I’ve opened the TV and checked/reseated the accessible connections.
Nothing on the power supply or main board looks obviously burned, swollen, cracked, or damaged.
The relay click is definitely coming from the PSU.
The power board visually looks clean, and the relays/components appear physically secure. The main board also looks clean.
I’m currently trying to determine whether this is most likely the power-supply board, main board, or a panel/panel-electronics failure. I’d rather diagnose it properly instead of throwing replacement boards at it.
Has anyone had this exact failure on an OLED55C1PUB/C1? If so, what ended up being the culprit? Are there any known failure points or safe isolation/diagnostic tests that can distinguish a bad PSU from a bad main board or OLED panel?
I can post detailed pictures of both boards and the connectors if that helps.