My phone is dead and not workin

@shikhadevi you are not giving us a good history here. First off you do want to replace the screen. While you are at it, replace the battery as well. This "phone was dead and not working from long time" could mean that the battery has been discharged below it's charging threshold and does no longer accept a charge.

Once you have replaced those things, re-evaluate your phone and see if it works. If your phone still should not charge or turn on, I suggest you replace the charging board as well. Since iFixit does not yet have any specific guides for this phone, use the ones from from here They are written in Spanish so use a browser that does the translating for you, if needed.

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 a device with the same issues as you do. 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!