TV won't boot up

Westinghouse WD24HB6101. 24" with DVD player.

I plug it in, LED lights red. I press on/off button or use remote. LED lights blue, Logo appears after a second or two. TV turns off after 10 seconds, then immediately restarts on/off cycle. Cannot turn off with on/off button or remote, must unplug it.

I disassembled. Nothing obvious. Caps look OK. All voltages marked on PCB are in spec. 1V, 3.3V, 5V, 12V.

Can't find any schematics.

Any ideas as to what is happening?