I followed one of the helpful tips I found on here and I improvised it with mine.
The cause of this issue is shown in the link [guide|10592|stepid=79383]
But I couldn't find mine cause it's been long I changed the screen and couldn't find the old broken screen, so I try all I could but the last trick worked,
When you follow the link I added you will find out that the cause of this is the pressure the screw at the top left of the speaker is much harder and the more harder it's gets the more the pressure it get on the speaker and that won't make it work.
So I try my last trick that works for me and by not using the top left screw and only use the down right screw to hold down the speaker and the phone sounds as clear and it was before and now perfectly working.
My best advise is to take out the top left screw and leave the down right screw to hold the speaker for not putting much pressure on it if you can't find the rubber holding that angle showed in the link description.
I wish you best of luck.