Ear Speaker Not Working - Totally muted

Hi, can somebody help me regarding the problem with my iphone X. My ear speaker is not working after screen replacement. Face ID and ambient light sensor is working well, Flex cable does not have any visible physical damage. Tried to replace the speaker itself only and I tried all type of reset but still no luck. I tried replacing with another full ear speaker with flex assembly and it is working. but the thing is it loose the Face ID functionality. =( please kindly help me what more possibility to fix my old speaker because i don't want to loose the Face ID function. Thanks!