It has a separate power supply that provided 12Vdc at up to 4A.
A quick test of the TV with a substitute power source provided by a bench power supply, showed that the TV was fine. It was just that the external power supply wasn't able to supply the required current, even though it did appear to work OK superficially.
Before throwing the power supply in the bin, a quick look inside revealed that a couple of the final stage electrolytic capacitors appeared to have swelled, with slightly rounded ends.
These two capacitors were rated at 1000uF and 1500uF, both 16Vdc.
I simply replaced them with slightly larger electrolytic capacitors of 1000uF and 2200uF, with higher voltage rating of 25Vdc.
There was adequate room to fit these slightly larger capacitors; and it seemed a good idea increase the voltage rating of the capacitors because it is likely that they failed because they were too close to their rated voltage.
Another power supply fixed by replacing faulty electrolytics.....
