Sony STR-DE545 Operating Instructions Manual page 21

There's no sound from a specific component.
Check that the component is connected correctly to
the audio input jacks for that component.
Check that the cord(s) used for the connection is
(are) fully inserted into the jacks on both tee
receiver and the component.
No sound is heard from one of the front
speakers.
Connect a pair of headphones to the PHONES jack
and set the SPEAKERS selector to OFF to verify
that sound is output from the headphones (see "[_
SPEAKERS selector" and "PHONES jack" on page
23).
If only one channel is output from the headphones,
the component may not be connected to the
receiver correctly. Check that all the cords are fully
inserted into the jacks on both the receiver and the
component.
If both channels are output from the headphones,
the front speaker may not be connected to the
receiver correctly. Check the connection of the front
speaker which is not outputting any sound.
If you encounter a problem that is not included above, see
"Troubleshooting" on page 45.
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