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This is what the manual says:
PROTECT"and "PUSH POWER" appear
•A strong signal was input.
Press ?/1 to
turn off the power, leave the system
turned off for a while, then press ?/1
again to turn on the power.
•Check the speaker cables in case
"PROTECT" and "PUSH POWER"
appear alternately again after you turn
the system on.
The only thing I can think of is its goin into protection mode like an amplifier would, you maxed the volume out and it's protecting your speakers or you don't have the right voltage going to it, I can see you don't have it on a straight 120v plug and you might have the wiring wrong on the speakers to it might be too low of a ohm or too high
The display power protecct means that it is a safety shut off of the set to prevent further damage. It is possible that your output stage is faulty. shorted or malfunctioning. The protect cirrcuit can also create up this cut off. So you need to remove the speakers first and check if the speakers are short. If not check the putputs for the short, disccoonect the output drivers and check . if the set powers then it is confirmed that the driver is faulty replace and test. You will need a good multimeter and some basic electronics to probe into these circuits. Hope you try. Good day