I have a onkyo TX-NR616 receiver which has now for some reason has no sound when fist switched on, however if left on for about 15 minutes then turned off and straight back on again then after a few s

Hello, we do not provide schematics to end users only authorized service centers. I suggest taking it to a service center. Thank you, Onkyo USA

Hi, Are all of the left side speakers out? If they are the receiver would need to be serviced. Thank you, Onkyo USA

HI
since when you have this unit ?
when did this problem started?
the more information is better so i can help you
Regards

Hello, Vtuner is going through changes in terms of the stations that they cover. Are you getting "no item" for all stations or is it just some of them? I would test by trying to go to a local station that you know works to see if this is happening across all stations. Thanks, FJD

This may be helpful:
Loss of Audio/Network Connection Customer Care Program

Onkyo USA Corporation

sounds like a faulty cable or psu .... or some bad solders on the back of a scart socket if you use scart
if not its something to do with TV detection the TX-NR unit uses

The amp protection circuit has been activated. Remove the power cord from the wall outlet immediately. Disconnect all speaker cables and input sources, and leave the AV receiver with its power cord disconnected for 1 hour. After that, reconnect the power cord and reconnect an input and a pair of speaker wires onto the unit. If the receiver still does not turn on than you will have to bring it in for service. Turn up the volume and if the receiver doesn't shut down, power off the receiver and add another pair of speakers. Power up the unit again and turn up the volume. If it doesn't shut down, power off the unit again. Now connect all your input sources and turn on your receiver. If the unit shuts down again, your unit will need to be further serviced at an authorized Onkyo service center.

harder to do but you can probably still use the display on the unit.
I am unfamiliar with the onkyos but am often setting up integras which are basically onkyos.

Find the setup button on the face of the receiver. It might be called different things but basically you will call up the settings and use the arrows - enter - and return to navigate in and out of the menu options.

Integras have that will allow you to;
configure connected speakers
- sub yes-no
- center yes - no
- rear surround yes-no
- speaker size small-large

input config (mapping audio, video connections to the input names)
ex:
- "Cbl/Sat" -> HDMI 1 - 4
- "BD/DVD" -> HDMI 1 - 4

etc.

You'll get the hang of it.

OR - do you have a small TV with a composite video connection?

I carry around a portable Coby battery powered monitor that has a composite video input for these types of problems. Composite video is always active.

Good luck!

I used 5002 and it works for on/off only. This is better than nothing. You can try codes from other Onyko devices to see if you can get one that provides more functional control.

An stepdown transformer is needed should you buy in US and use it Europe

However, if your on a technical side , trace the primary windings , and check

There are European versions which are already 220V, no need to convert.


Source : page EN 99 of the Onkyo TX NR616

manual