New tests and ...
One 10 meters HDMI cable not working (the one from the UDH player to the HD621for the sound)
One digital coaxial output not working on the blu-ray player. Set in bitstream mode(no probem with my HD-DVD player using the same cable and same G68 input) It was supposed to be the alternative solution if the HD621 issue was not solved.
One HD621 that no longer output the video signal. Sound is ok.

What a wonderful day... frown

Last edited by Serge; 2021-04-11 18:50.
G68ADV + HD621 (dead)
2xBSS 366
LCR Yamaha DSR112
4 Surround Presonus Eris E8
1 JBL 4645C sub and 1 DIY sub with WGTI15 woofer (Crest Audio 8001 amplifier)
3D-Lab Dvd Master/Panasonic BDT700/Panasonic UB420
JVC X7900