Some models of amp have the ability to switch speakers off. So look at the settings of the speakers. Most models have test tones for the speakers. Run that and see if it actually applies the test. If it doesn't then they might be switched off.
The other cause is the output devices for those channels have failed. The amp may use a device that powers both the channels, but separate ones for the others.
SOURCE: Sony STR-DE845 center channel cut out, receiver clicks
I have fixed 3 shorts on my de845. 2 have been caused by cracked solder joints. they were speaker cutout problems...yours most likely is the center channel relay on the main board. take the thing apart. you need to get to the back of the main board and re-flo those solder joints. get your geeky pc buddy and do it together(buy him a sixer). its really not that hard...just a bunch of screws. disconnect everything from the main board including the front plate. be careful with the ribbon cable...mine is hurting at this point. not meant to be removed so many times. put it in straight. my leads bent, but was able to straighten them. there are 5 relays together, one for each channel. they are white cubes and prb a little smaller than the tip of your finger. its the 4 leads on each of these that you want to take a soldering iron to . i'm not sure which ones the center channel so do them all in that area. it may be hard for you to tell which leads they are so just go overboard and at least get everything in the vacinity. i did all component leads because who's to say another's not ready to go bad. you've gone this far. touch the heated up tip to all the leads at the very end of the barb. you can reflow the solder without actually touching it. the metal lead will get hot enough. hold it until the solder liquifies, then let it cool. do this on a flat surface. my other fix once was a re-seating at the speaker switch a,b,a+b on the front plate. there are 2 boards plugged together there. i bent the leads slightly so they seated in more tightly. if your left or right front goes out, sometimes thats an easy fix...try b if you're using a, or the opposite. don't forget the speaker cables. if you're using both zones then you prb already figured out you need to re-flo! test and cross your fingers. good luck.
SOURCE: 4 ohm speakers for 8 ohm impedence on receiver (HT)
ya cant run them 4 ohm on 8 ohm sterio run super hot then fail sooner gota get sum nice 8 ohm ones ok flouece off ebay is relly good cheap 8 ohm
SOURCE: STR--DG910: no rear speaker sound, no center speaker sound
if you confirmed all connection repeat your speaker setup.
SOURCE: "PROTECT"flashing, no response, STR-SE391
The audio amplifier IC are fried and need to be replaced
SOURCE: No sound from rear speakers during test tone usng Sony STR-DE475
I had this problem last night.
To solve it, you can reset the amp by:
1) Put the receiver on stand-by
2) Hold down "MODE" button and press on button
3) "S.F. CLR" appears in the display and surround is back on.
Good luck
Dr Gardner
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