Iam a common electronics engineer can you help me in fixing sony 5.1 home theater on protection mode

Sounds like a PSU problem, or your electric wall isn't stable.

try disconnecting all speaker wires from the main unit, then turn it on. If it still goes into protect - then the amp is blown and you need to replace the main board.

You unit is most likely has DC Offset(a damaged amplifier). Unless you are an audio specific technician, this repair is not a DIY. If you'd like more information, or would like to inquire about having your Sony repaired, please visit my website at audioserviceclinic.com. You may contact me there. Thank you.

The "PROTECT" and "PUSH POWER" messages will flash alternately when the protective device of the amplifier has been activated because a strong signal was input, or if there is a short-circuit detected. Press the POWER button on the unit to turn off the system, and check the following items after "STANDBY" disappears.

1) Are the + and - speaker cords short-circuited?
2) Are you using only the specified speakers?.
3) Is anything blocking the ventilation holes of the system?

You may also refer to the following link for additional troubleshooting steps.

PROTECT and PUSH POWER flash alternately on the amplifier screen

Hello,
These Usually a protect fault will indicate a bad transistor in the amplification section. I suspect that the control circuit is sensing a fluctuation in the power supply and going in to protect mode. (assuming that the protect circuit itself is working properly) If a voltage is too high the unit will go in to protect mode to prevent damage to the speakers and the rest of the unit. I would take the unit in to a local repair shop and get a estimate of repair charges. Expect a 60 to 80 dollar repair charge depending on how many parts need to be replaced and what the repair labor rate is in your area.

Hope this help in solving the problem....

Push power protect is an error message that shows unit got some problem in output amplifier section and protection circuit is activated to avoid further damage.
Local tv repair shop will help you to fix it as unit will take apart and soldering work is also involved to replace bad amplifier output chips.

Always be the audio amplifier IC damaged

Protector mode does not just react to ambient temp. Try unplugging all the speakers from the back of the unit and turning it on. If it continues to go into protect mode, it is most likely a bad power supply or possibly a bad D/A circuit. If it does not go into protection mode when the speakers are disconnected, try hooking up one speaker at a time (while the unit is off) If the unit faults again when you turn it back on, it should point toward a bad speaker or crossed wires.

on my home theater display it shows protector push power