This is a protection warning. There is a problem with the power output. Make sure that all the speaker wires are NOT shorting-out (visual inspection). You can test the cables with a multi-tester set at the 20 ohms scale, by unplugging from the amp and testing each cable pair at the terminal. They should read anywhere between 4 and 10 ohms resistance (resistance close to 0 indicates a short)..
If the Speakers/cables are good then you have a burned power output stage or a cold solder joint at the fault sensor circuit.
SOURCE: My Sony LBT- LX30 stereo
You probably have a blown amp ic or the output transistors. But disconnect the speakers and turn it on could be a bad speaker if it turns on.
SOURCE: Hi there I have a Sony LBT XG100AV Stereo System,
I have the same unit, although it's a bit old now. I used to get that problem, and the protection system is to protect the unit from over-heating, and the main cause is its because the unit is getting hot and/or there isn't enough air going through the rear of the unit. I found a fan or better air flow helps.
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