SOURCE: stuck in protect mode
Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.
SOURCE: Protection Problem with Sony STR-DB780 AV Amp / Sony SA-VE535HS speakers
How have you checked for shorts in your wires? Did you use a multimeter? Test the resistance of your new wires compared to the old wire, should be close to the same and next to nil on the same wire but if you don't get infinity between pairs then you have a short.
About your second problem, what kind of connection are you using for your TV sound? Sounds like it's a digital connection but is it coax or optical? Sounds as if it loses sync with your signal and has to resync. If you are using optical you may have a bad cable if you are using coax the cable may be picking up interference from something or the cable may be bad.
SOURCE: code for sony receiver model str d565 protect mode
If you need support you can log into:
http://esupport.sony.com/US/perl/support-contacts.pl?mdl=STRDG510
for free tech support on sony chat line
SOURCE: Sony "Protection" mode - STR-DE725
My sony used to do that to umm cant remember the model but yeh i could play it at low volume but as soon as i turned it up it would start clicking and telling me to turn of the power...
I resolved it by checking every cord connected to it, it turned out that because I connected two speaker cables together i didnt seal it properly and they were touching this was making it go into protetion mode.
SOURCE: STR--DG910: no rear speaker sound, no center speaker sound
if you confirmed all connection repeat your speaker setup.
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