It seems a lot of people can be confused by the power LED on the TV they're working on. If you've never seen a particular model, the LED may be confusing if it doesn't behave as one might expect. A list of typical power LED states for a variety of brands are included in this post.
Atec (Only one model for sure)
Power LED is RED in standby. Powering up the TV makes the LED go ORANGE, then GREEN. If no input present or the signal isn't present, may go orange again. No known blink codes.
Hyundai (Only one model for sure)
Power LED is RED in standby. Powering up the TV makes the LED blink GREEN, then go solid green.
LG (Older models)
Power LED is RED in standby, then WHITE or GREEN when powered on. May flash when first powering on. Only blink code is continuous flashing on some models, which indicates a power on fault (generally non-specific though typically the PSU.)
LG (Newer models)
Power LED is RED in standby, and pulsates red when powering up. Once powered up, the LED goes out or turns BLUE or WHITE. No known blink codes.
Panasonic (European, possibly other regions)
Power LED is RED in standby. Immediately detected errors detected lead to a blink code (see service manual.) When powered on, the LED will then blink GREEN. If an error is detected during the power on phase, an error code will then be thrown (LED will blink red.) If the self-test succeeds, the LED will light solid green and the TV should be fully powered up. If a fault occurs during operation, a blink code may be thrown in the same way as before.
Panasonic (US)
Power LED is RED in standby. Immediately detected errors detected lead to a blink code (see service manual.) When powered on, the LED will then blink red rapidly. If an error is detected during the power on phase, an error code will then be thrown (LED will blink red.) If the self-test succeeds, the LED will light solid red and the TV should be fully powered up. If a fault occurs during operation, a blink code may be thrown in the same way as before.
Philips (Some models)
Power LED is RED in standby. When turned on it may go BLUE or GREEN. If an error occurs, a blink code may be used (this may be green, blue or red.)
Samsung
Standby WHITE, RED or BLUE. When turned on, usually blinks. When fully powered up the LED will extinguish. No known blink codes.
Sharp (non-Vestel) (some models)
Power LED is RED in standby. When turned on, LED turns green. If an error occurs, the LED will go red and will flash along with the OPC LED. The combined error code greatly narrows down the issue: an error of 2-5, for example, indicates a main board 5V failure. (One can wish for other manufacturers to implement this... but they haven't.)
Sony
Power LED is RED in standby. When turned on, may or may not blink. LED turns GREEN when turned on. Blink codes on some models (refer to service manual.)
Toshiba (non-Vestel)
Power LED is RED in standby. Powering on may result in a GREEN power LED. If an error occurs, the green will go off. No known blink codes.
Vestel
LED is typically lit in standby, and may vary in colour. This varies with each model. When powered on, if a self test fails, the LED will blink continuously until the unit is unplugged. LED is typically dark when powered on. No known blink codes.
Vizio
Glowing logo usually ORANGE in standby. When turned on goes WHITE. An error after turning white will typically lead to the LED staying lit white. No known blink codes.
Atec (Only one model for sure)
Power LED is RED in standby. Powering up the TV makes the LED go ORANGE, then GREEN. If no input present or the signal isn't present, may go orange again. No known blink codes.
Hyundai (Only one model for sure)
Power LED is RED in standby. Powering up the TV makes the LED blink GREEN, then go solid green.
LG (Older models)
Power LED is RED in standby, then WHITE or GREEN when powered on. May flash when first powering on. Only blink code is continuous flashing on some models, which indicates a power on fault (generally non-specific though typically the PSU.)
LG (Newer models)
Power LED is RED in standby, and pulsates red when powering up. Once powered up, the LED goes out or turns BLUE or WHITE. No known blink codes.
Panasonic (European, possibly other regions)
Power LED is RED in standby. Immediately detected errors detected lead to a blink code (see service manual.) When powered on, the LED will then blink GREEN. If an error is detected during the power on phase, an error code will then be thrown (LED will blink red.) If the self-test succeeds, the LED will light solid green and the TV should be fully powered up. If a fault occurs during operation, a blink code may be thrown in the same way as before.
Panasonic (US)
Power LED is RED in standby. Immediately detected errors detected lead to a blink code (see service manual.) When powered on, the LED will then blink red rapidly. If an error is detected during the power on phase, an error code will then be thrown (LED will blink red.) If the self-test succeeds, the LED will light solid red and the TV should be fully powered up. If a fault occurs during operation, a blink code may be thrown in the same way as before.
Philips (Some models)
Power LED is RED in standby. When turned on it may go BLUE or GREEN. If an error occurs, a blink code may be used (this may be green, blue or red.)
Samsung
Standby WHITE, RED or BLUE. When turned on, usually blinks. When fully powered up the LED will extinguish. No known blink codes.
Sharp (non-Vestel) (some models)
Power LED is RED in standby. When turned on, LED turns green. If an error occurs, the LED will go red and will flash along with the OPC LED. The combined error code greatly narrows down the issue: an error of 2-5, for example, indicates a main board 5V failure. (One can wish for other manufacturers to implement this... but they haven't.)
Sony
Power LED is RED in standby. When turned on, may or may not blink. LED turns GREEN when turned on. Blink codes on some models (refer to service manual.)
Toshiba (non-Vestel)
Power LED is RED in standby. Powering on may result in a GREEN power LED. If an error occurs, the green will go off. No known blink codes.
Vestel
LED is typically lit in standby, and may vary in colour. This varies with each model. When powered on, if a self test fails, the LED will blink continuously until the unit is unplugged. LED is typically dark when powered on. No known blink codes.
Vizio
Glowing logo usually ORANGE in standby. When turned on goes WHITE. An error after turning white will typically lead to the LED staying lit white. No known blink codes.
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