Fifth generation of iPhone. Repair of this device is straightforward, and requires screwdrivers, prying tools, and patience. GSM/CDMA / 16, 32, or 64 GB / Black or White.

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could I find a data sheet of iPhone 4s logic board?

hi everybody!

I repair i device since a few years ago but it was just for basic fix as change a screen or dock flex, camera... nothing hard...

but now I try to fix motherboards problems, change power ic, screen connector, wifi/bluetooth ic...

I have a lot of iphone 4s logic boards with missing resistors and capacitors situated between the lcd connector and the wifi/blue-tooth ic see picture:

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I'd like to know how could I identify them, their names, their functions (capacitor or resistor?), their values, where could I buy this small "things" and if I can find data sheets of iphone motherboards?

I know, I have a lot of questions in one time but I'm checking on Internet since a few month without any results, and my location ( Dominican republic) is not a real advantage. So I'm sure that your answers will be very helpful

thanks a lot!

Answered! View the answer I have this problem too

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Thanks a lot for your answers!

I bought a smd rework station a few months earlier. I use it to remove ic from boards but for soldering I prefer use an oven with a 130*C solder paste, works fine, for my practice, I used two old CDMA i4, killed first (when desolder the ic a part of the circuit get out with the chip) and the second still works fine (I removed the power IC to change it on both of them)... I also tried to solder resistors and capacitors with the iron of my station but I can't... for me it doesn't work but in oven it does... Just a bit hard to place component on board...

I will check on mouser.com that I didn't know, thanks for this tips! Does the size of resistor or capacitor change the value?

I just found schematics of i3,i3gs,i4,i4s and i5 it will be very helpful for my work!

Thanks a lot for your help and if interest for someone I can share my work and pictures of it.

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mael, it is always good to make some guides from the repairs. This is where you would post guides for the 4S http://www.ifixit.com/Guide/new/Device/i... Does the size of resistor or capacitor change the value? No it does not, but for your repairs you have to change the broken components with alike components. Always make sure that the package i.e. 01005 etc are the same when you order your parts. The "oven" may work for some of the parts, but it will not work for the smaller resistors or capacitors. Practice plenty with your reflow station. Good luck to you.

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mael, here is a quick description of the parts listed in your "red boxes"

FL13 80-OHM-0.2A-0.4-OHM Coil used here as filter

C75 1.0UF 20% 6.3V 0201-MUR capacitor

C70 1.0UF 20% 6.3V 0201-MUR capacitor

C68 1.0UF 20% 6.3V 0201-MUR capacitor

C69 1.0UF 20% 6.3V 0201-MUR capacitor

C405 56PF 5% 16V NPO 01005 capacitor

C76 1.0UF 20% 6.3V 0201-MUR capacitor

C21 100PF 5% 25V Cerm 201 capacitor

C273 100PF 5% 25V Cerm 201 capacitor

FL4 240-OHM-0.2A-0.8-OHM Coil used here as filter

FL3 240-OHM-0.2A-0.8-OHM Coil used here as filter

C204 0.1UF 10%6.3V X5R 201 capacitor

FL7 80-OHM-0.2A-0.4-OHM Coil used here as filter

C231 56PF 5% 16V NPO 01005 capacitor

C245 56PF 5% 16V NPO 01005 capacitor

C187 56PF 5% 16V NPO 01005 capacitor

C125 56PF 5% 16V NPO 01005 capacitor

R48_RF 10K 1% 1/32W 01005 resistor

R95_RF Oohm 5% 1/20W 201 resistor

C70_RF 0.01UF 10% 6.3V 01005 capacitor

As you can see, a lot of those components are repetitions. These are readily available at places like mouser.com or digikey.com. Please familiarize yourself with the sizes of those components. The packages i.e 01005 identify the sizes. It will not be easy to solder those. I suggest to invest in a good source of magnification and a very good soldering iron with a very fine tip, as well as a reflow station. Board level repair is extremely difficult to learn and will require plenty of practice. Hope this helps, good luck.

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Circuit diagrams and logic board layouts are copyrighted and supposedly confidential, spreading them over the internet is illegal. Nonetheless they're out there, you can get a copy yourself.

If searching for iPhone 4s does not work, try N94. It's the factory code for the iPhone 4s

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mael will be eternally grateful.
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