Hi friend-as you can see i asked long-time ago for help on the same problem and i recieved no answer so i left the phone in cuboard to see if solution will arrive;then yesterday i got another-one from other cell shop with same problem i looked on forum and could find nothing that is when i saw your post;I started to play with phone and took the charging block off-inserted the sim and sidar phone working perfect accept no charging block i put new charging block and phone is perfect then took other-one out of cuboard and did same and also phone now 100% working so mybe you also try out and let me know i hope this is solution for this problem
enjoy