How to fix standby light on will not turn on

Usually it is the power board. Try finding a replacement power board it should fix the problem.

I fixed my 55" Samsung with the exact same symptom.

Most times a standby light is meant to stay on when the unit is turned off.

any luck trying to turn off the stand by mode?

sounds like a dry joint in the power supply wiring inside,probably the printed circuit.easy to fix for an radio shop

you need to have service manual copy to check amplifier output section as it seems defective. There are few websites that offers service manuals download for small fee.

Hi...1st off ...make sure all the speakers are connected at both ends.
2nd..buy a new cat..one that doesnt drool.
If it's still stays in Stdby after checking speakers, It might have blown an internal fuse cause thats where those darn stereo people put them now.

I managed to find a local repair man who fixed the problem. He put in a new transformer.

The display is back-illuminated by small incandescent bulbs. Burnt out bulbs equal no display, although the chances of several bulbs failing at once is not high so the power supply for the display/bulb assembly is a good place from which to start fault finding.

It needs a repair shop - as a user there's nothing you can simply dig into to fix.