no sound on speaker mode viber videocall and whats app video call

hi i hope you could help me with my problem on my Sony Xperia XZ1 Compact i have done reset even downgrade firmware back to oreo software repair still no chance but when i watch youtube there speaker video call and speaker phone it the only problem and last i use service menu test i found there are Speaker works fine, Earphone works fine, Stereo Left works fine and last Strereo right no SOUND i already replaced ear piece speaker and still had no luck