My is no clear sounds

@okothnyakinda if you have no clear sound on your handset speaker but have clear sound when you use a headset, then it is the speaker that needs to be replaced. If you don't have a clear sound at all then the issue is with the audio circuitry on your main board. That will require that you have the schematics, know how to trace a circuit and have the right tools to perform a board level repair.

For now you may need to consider replacing the speaker first. Since iFixit does not yet have a specific guide for that use something like this guide It is written in Spanish. Use a browser that can do the translation for you, if needed. Replacement speakers are readily available.

While you work on your phone, take lots of pictures. Once you are done with it, take those pictures and create a guide for iFixit. That will help the next person that has the same issues with their device. It's easy and fun to create these guides. https://ifixit.com/Guide/new The iFixit community will appreciate this.

Repair is War on Entropy!