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If protect is coming up on the display, it means the system is detecting a short somewhere on one of the speakers and so is turning the amp off to avoid damage. Check all the connections at the back of the amp to ensure they are not shorting, and at the back of each speaker, if nothing is found there, check each wire for damage (like squashed or rodent damage).
If you are a technician desolder the Audio amplifier IC,and check if the stereo turn on but with no sound.If the stereo turn on the audio amplifier IC is in short circuit and need to be replaced.
I do apologize for the problems you are having with your audio unit. The protect mode indicator will appear when the unit detects abnormal resistance in your speaker setup. I recommend removing any additional speaker wire that may be added to the unit to extend the factory speaker lengths. Also, make sure you have all the factory speakers attached, and all non-factory speakers removed. Finally, please unplug you unit from he wall for 1 hour after checking all of the above suggestions to completely reset your unit.
If you are still having issues after doing all of the steps mentioned above, the unit may need to be evaluated by a Sharp Authorized repair center.
You have a blown amplifier IC in the stereo that must be replaced, that is what causes the protect error on the display. It is a good idea to take it to a repair center and have them do it if you are willing to spend about $125 to $150, depending on the rates of the shop, to have it repaired. Otherwise, you will just need to get a new one. There is no other way to fix this problem without replacing the amp IC.
Sorry for the bad news, I wish I could have given you an easy fix, but there just isn't one for this problem.
The protect message indicates that there is a problem with the output amplifier section. Verify that the speaker wires are not shorted together. If they are fine, there is an internal problem that is usually the output transistors. Your specific model I believe uses an amplifier pac (STK411-230). It should be replaced. It is available from tritronicsinc.com using part number VHISTK4113E-1 at a cost of $83.04.