Sony STR-DH540 AV Receiver works as 3.1 instead of 5.1?

so
- in PlayStation
2

I have connected a Sony STR-DH540 AV Receiver to LG 5.1 Surround Sound System ---

Tone tested, all good, all 5 speakers are fine

but when I try the system with a '5.1 video test' on Youtube (through Playstation 3), only the two front and center speakers work.

instead of the two rear speakers, the noise comes from the two front speakers!

All cables are set correctly!

what's the problem?

Na

How many channels does the app and PS3 support? What is the sound format of the YT film? If only stereo arrives at the receiver, it also switches to stereo. But most receivers can artificially create surround sound.

so

PS3 supports up to 5.1 speakers, here is the film

It has to be a video for testing.

The problem is that with PS3 and TV also the rear speakers are out of order…