signal does not appear

I have tried to repair the signal IC but have not gotten the result, because when I bought this phone it was used to be repaired, which parts need to be rechecked

crwdns2934089:0crwdne2934089:0 crwdns2934093:0crwdne2934093:0

crwdns2934109:0crwdne2934109:0

crwdns2889612:0crwdne2889612:0 0
crwdns2934285:0crwdne2934285:0