Thank you for taking my problem in consideration.
Yes, I tried different configuration. ( speaker left to speaker right and source left to source right) and it's always the same, the L out is definitly not powered and noisy.
Speakers have been tested, I have three wave shield working good, I think I should have bought at least two stereo amplifier for testing damn it.
As you requested, I have taken some photos of my solder :
Here you have a better view of everything, in case you think this the mess here, I want to add I have tested everything here!