I was fortunate enough to get an Advance Acoustic x-i90 because it has a fault.
The amplifier works if I remove the jumpers from pre-out to amp-in and connect the audio source to AMP IN.
But if I try the other inputs, I get no sound output.
All the functions on the front panel seem to work as normal.
https://www.easylounge.com/amplificateur-hifi/advance-acoustic-x-i90-noir-52374
Hard to search for errors without the schematic (have sent an e-mail to Advane Acoustic, but no response yet)
HCF4052BE is used for input select - seems to work fine
There is an JRC4558D op amp where I do not find any signal, so this may be the reason? Have placed an order for a new one to test
Any one else with this problem? Or any one have the schematics to share?