Iphone 6 no service even after replacing all network ICs
 

Hi everyone
I have an iphone 6 that shows no sim when there is no sim inside but when you put a sim card into it , it just show searching and no service i tried to replace U_DSM_RF and it worked but one week later came back with the same problem so i tried to reball BB CPU and checked the pads all ok no broken prints i also replaced All network ICs such as: U_WFR_RF, U_WTR_RF, U_PMICRF, U_2GPARF,U_MBPAD, U_ASM_RF,U_HBS_RF, U_LBPAD, U_VLBPAD, U_HBPAD, FT_41BC, FT40A41A, U_QPOET, L4001_RF, L4003_RF, U_BUFFER, but stillnoservicealsowheni try to get *#06# the imei doesn't show up so i guess it's baseband problem but I don't know what else i can replace or wherei have to check?? Any ideas?

Thanks

check if BOTH IMEI and Modem firmware are present in Settings

are you sure you replaced all network parts ? they are about 250 components !!!! one small short is enough to disable the IC's from functioning well
Regards

Thank you for you reply

I have only replaced the IC's i didn't replace the capacitors,resistors...etc and i have both of imei and modem firmware in settings but when i try to enter *#06# on dial the imei does'nt come up, also i checked baseband voltages i have one voltage missing, on C3208_RF it suppose to be 1.9V but i have 0V i tried to replace BB PMIC but still no volt.

I just replaced C3428_RF and C3208_RF since there is no voltage on them i thought maybe one of the cap is shorted to GND but still the same problem

I have replaced the BB PMIC again but still no voltage on C3208_RF?? anyone have had this issue before?

try to get *#06# the imei doesn't show up so i guess it's baseband problem


it is indeed baseband sir...

try to mild reheat baseband ic if no luck reball or change baseband chips

i have reballed baseband ic more than 5 times but still no imei

take a look over here : iPhone6 ÓöÎÞ·þÎñ¹ÊÕÏ£¬Ô*À´ÊÇÕâ¸öÔ*Òò¿ÉÒÔµ¼Ö -

no service is common issus for ip 6+ , see the link, then you know how to repair it.

iPhone6ÎÞ·þÎñάÐÞרÌâÌû -

thank you guys for your reply i have checked the links and most of the photos on that site says U1 was broken so i checked the connection between

U1 and PP3171_RF
U2 and PP3173_RF
U5 and PP3172_RF
R5 and PP3170_RF

i set the multi meter on Beep ( Buzzer) mode and test and it was beeping is that enough or i need to check the resistance too?

Thanks

for some reason i can not upload photos on this site. i have made a jumper from PP3171_RF to U1 under the baseband CPU but still no IMEI.

i checked the voltages S1,S2,S3,S4 and all are present so any more ideas please? because i don't know where i have to look i checked and replaced many IC's but still no imei

this is your issue : iPhone6 ÓöÎÞ·þÎñ¹ÊÕÏ£¬Ô*À´ÊÇÕâ¸öÔ*Òò¿ÉÒÔµ¼Ö -

Thank you man for your help but i already checked under BB CPU there is no broken pads. this link you sent me says something about print number U1 under the baseband cpu right? because in the 3rd photo the guy made a jumper on R4609_RF? does it have anything to do with IMEI?

thanks