GSM Shop GSM Shop
GSM-Forum  

Welcome to the GSM-Forum forums.

You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features.
Only registered members may post questions, contact other members or search our database of over 8 million posts.

Registration is fast, simple and absolutely free so please - Click to REGISTER!

If you have any problems with the registration process or your account login, please contact contact us .

Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

Reply
 
LinkBack Thread Tools Display Modes
Old 12-05-2016, 13:39   #1 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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
  Reply With Quote
Old 12-05-2016, 22:20   #2 (permalink)
Freak Poster
 
Join Date: Dec 2014
Location: PCB
Posts: 315
Member: 2320407
Status: Offline
Thanks Meter: 88
check if BOTH IMEI and Modem firmware are present in Settings
  Reply With Quote
Old 12-05-2016, 22:22   #3 (permalink)
Freak Poster
 
Join Date: Dec 2014
Location: PCB
Posts: 315
Member: 2320407
Status: Offline
Thanks Meter: 88
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
  Reply With Quote
Old 12-06-2016, 01:13   #4 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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.
  Reply With Quote
Old 12-06-2016, 02:32   #5 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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
  Reply With Quote
Old 12-07-2016, 03:13   #6 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
I have replaced the BB PMIC again but still no voltage on C3208_RF?? anyone have had this issue before?
  Reply With Quote
Old 12-07-2016, 04:43   #7 (permalink)
Insane Poster
 
Join Date: Aug 2016
Posts: 61
Member: 2608533
Status: Offline
Thanks Meter: 3
Quote:
Originally Posted by Mobilerepair111 View Post
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
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
  Reply With Quote
Old 12-07-2016, 07:50   #8 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
i have reballed baseband ic more than 5 times but still no imei
  Reply With Quote
Old 12-07-2016, 18:35   #9 (permalink)
Insane Poster
 
Join Date: Aug 2012
Posts: 82
Member: 1803209
Status: Offline
Thanks Meter: 10
Quote:
Originally Posted by Mobilerepair111 View Post
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 -
  Reply With Quote
The Following User Says Thank You to ll_r1d0_ll For This Useful Post:
Old 12-07-2016, 21:12   #10 (permalink)
Freak Poster
 
jimchu316's Avatar
 
Join Date: Sep 2014
Location: CN & NZ
Posts: 388
Member: 2252373
Status: Offline
Thanks Meter: 400
Quote:
Originally Posted by Mobilerepair111 View Post
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
no service is common issus for ip 6+ , see the link, then you know how to repair it.

iPhone6ÎÞ·þÎñάÐÞרÌâÌû -
  Reply With Quote
The Following 3 Users Say Thank You to jimchu316 For This Useful Post:
Show/Hide list of the thanked
Old 12-08-2016, 01:09   #11 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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
  Reply With Quote
Old 12-08-2016, 06:35   #12 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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.
  Reply With Quote
Old 12-09-2016, 02:11   #13 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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
  Reply With Quote
Old 12-10-2016, 16:49   #14 (permalink)
Insane Poster
 
Join Date: Aug 2012
Posts: 82
Member: 1803209
Status: Offline
Thanks Meter: 10
this is your issue : iPhone6 ÓöÎÞ·þÎñ¹ÊÕÏ£¬Ô*À´ÊÇÕâ¸öÔ*Òò¿ÉÒÔµ¼Ö -
  Reply With Quote
Old 12-11-2016, 03:48   #15 (permalink)
Freak Poster
 
Join Date: Dec 2016
Posts: 117
Member: 2656737
Status: Offline
Thanks Meter: 12
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
  Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


 



All times are GMT +1. The time now is 00:38.



Powered by Searchlight © 2024 Axivo Inc.
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2024 DragonByte Technologies Ltd.
- GSM Hosting Ltd. - 1999-2023 -
Page generated in 0.20097 seconds with 8 queries

SEO by vBSEO