iPhone 4S in fpr repair but missing IC's - GSM-Forum

kUMRA · 03-18-2013, 08:19

Hi Friends,

I am a first time poster to this forum. I have read the forums for a while though and they have been really helpful. I have been given a phone to look at that has a cracked Digitiser/LCD. However when I pulled the back off I have noticed that they have broken off multiple components from the board. I tested most of the phones functions and I cannot find anything wrong. Basically I am wondering what exactly they would cause to stop working/have issues, some appear to be part of the GPS signal filter. The components have the following ID's on the schematic:

U21_RF, C46_RF, C47_RF, C48_RF, C49_RF and R2_RF.

Any help would be greatly appreciated.

Thanks

simonchunk · 03-18-2013, 23:45

They are all part of your GSM signal. They will all need to be replaced to get it to function again.

kUMRA · 03-20-2013, 04:46

Thanks,

I assumed that was the case, I did some more looking in to the schematic and they seem to be specifically for the 850MHz signal if I am reading it correctly :P.

garry_b · 11-25-2014, 21:40

can i use any other fuses or can i just make jumper

garry_b · 11-26-2014, 09:58

Please help me can i make jumper or no??

PappaBaer2002 · 11-26-2014, 15:22

You can NOT jumper caps! If you do so, you'll make a short.

R2_RF is a resistor with 50 ohms and goes to gnd. Don't know if a jumper is possible. U21_RF seems to be a filter. Don't know if you can easily jumper pins 2 and 4.

garry_b · 11-27-2014, 00:46

Ok and anyone know where i can buy these

garry_b · 11-28-2014, 00:19

Please help guys i need these caps

03-18-2013, 08:19	#1 (permalink)
kUMRA Junior Member Join Date: Mar 2013 Location: New Zealand Posts: 2 Member: 1902141 Status: Offline Thanks Meter: 0	iPhone 4S in fpr repair but missing IC's Hi Friends, I am a first time poster to this forum. I have read the forums for a while though and they have been really helpful. I have been given a phone to look at that has a cracked Digitiser/LCD. However when I pulled the back off I have noticed that they have broken off multiple components from the board. I tested most of the phones functions and I cannot find anything wrong. Basically I am wondering what exactly they would cause to stop working/have issues, some appear to be part of the GPS signal filter. The components have the following ID's on the schematic: U21_RF, C46_RF, C47_RF, C48_RF, C49_RF and R2_RF. Any help would be greatly appreciated. Thanks

03-18-2013, 23:45	#2 (permalink)
simonchunk Freak Poster Join Date: Jul 2011 Posts: 239 Member: 1615254 Status: Offline Thanks Meter: 53	They are all part of your GSM signal. They will all need to be replaced to get it to function again.

03-20-2013, 04:46	#3 (permalink)
kUMRA Junior Member Join Date: Mar 2013 Location: New Zealand Posts: 2 Member: 1902141 Status: Offline Thanks Meter: 0	Thanks, I assumed that was the case, I did some more looking in to the schematic and they seem to be specifically for the 850MHz signal if I am reading it correctly :P.

11-25-2014, 21:40	#4 (permalink)
garry_b Freak Poster Join Date: Sep 2004 Age: 65 Posts: 316 Member: 82807 Status: Offline Thanks Meter: 18	can i use any other fuses or can i just make jumper

11-26-2014, 09:58	#5 (permalink)
garry_b Freak Poster Join Date: Sep 2004 Age: 65 Posts: 316 Member: 82807 Status: Offline Thanks Meter: 18	Please help me can i make jumper or no??

11-26-2014, 15:22	#6 (permalink)
PappaBaer2002 Crazy Poster Join Date: Jan 2014 Posts: 51 Member: 2110377 Status: Offline Thanks Meter: 5	You can NOT jumper caps! If you do so, you'll make a short. R2_RF is a resistor with 50 ohms and goes to gnd. Don't know if a jumper is possible. U21_RF seems to be a filter. Don't know if you can easily jumper pins 2 and 4.

11-27-2014, 00:46	#7 (permalink)
garry_b Freak Poster Join Date: Sep 2004 Age: 65 Posts: 316 Member: 82807 Status: Offline Thanks Meter: 18	Ok and anyone know where i can buy these

11-28-2014, 00:19	#8 (permalink)
garry_b Freak Poster Join Date: Sep 2004 Age: 65 Posts: 316 Member: 82807 Status: Offline Thanks Meter: 18	Please help guys i need these caps