iPad Air 2 USB device not recognised after NAND change - GSM-Forum

edin2008 · 07-08-2020, 10:24

Hope someone can help me with this

First befor i remove Nand ipad works just it had icloud,after removal and change serial number and solder it back ipad usb not reconised by pc,i remove nand and conect to pc without it,same problem,i see on forum that pc must reconise it without nand to.Cpu and Ram was protected with temp. tape, 20cent coin and shield

-try 5 diferent usb cable

-2 diferent pc

-no heat on board
-cpu cold
-no short on caps
-no missing caps

I dont know what to do and i remove u2 on end just to try something and one pin is missing ,dont know is that pin cause the problem and where it go,dont have for this model a pcb layout.

here is a photo from U2 missing pin

and here how i protect CPU and RAM

https://ibb.co/HYQ2RJt

edin2008 · 07-08-2020, 10:37

here is a photo from U2 missing pin

https://ibb.co/5nHPYpn

orx · 07-08-2020, 10:57

check image for print missing and try a jumper ..

ipad 2 air.JPG

edin2008 · 07-08-2020, 14:03

Quote:

Originally Posted by orx

check image for print missing and try a jumper ..

Attachment 376146

cant find that pins can u pls check my motherboard

https://ibb.co/HBNbhTR

**chand_gee** · 07-08-2020, 14:47

Quote:

Originally Posted by edin2008

here is a photo from U2 missing pin

https://ibb.co/5nHPYpn

your broken pin is no conection in ipad air2 wifi
no need to conect leave it missing
check another option
replace good cable new ic

**chand_gee** · 07-08-2020, 14:54

yes ipad must be detected in dfu mode without nand ic..
here is software you can use for
https://phoneboard.co/

edin2008 · 07-08-2020, 15:31

Quote:

Originally Posted by chand_gee

yes ipad must be detected in dfu mode without nand ic..
here is software you can use for
https://phoneboard.co/

thank you for the software i need it a long time.

the U2 i eplace now same problem cant reconise pc

07-08-2020, 10:24	#1 (permalink)
edin2008 Insane Poster Join Date: Jan 2014 Posts: 77 Member: 2114773 Status: Offline Thanks Meter: 20	iPad Air 2 USB device not recognised after NAND change Hope someone can help me with this First befor i remove Nand ipad works just it had icloud,after removal and change serial number and solder it back ipad usb not reconised by pc,i remove nand and conect to pc without it,same problem,i see on forum that pc must reconise it without nand to.Cpu and Ram was protected with temp. tape, 20cent coin and shield -try 5 diferent usb cable -2 diferent pc -no heat on board -cpu cold -no short on caps -no missing caps I dont know what to do and i remove u2 on end just to try something and one pin is missing ,dont know is that pin cause the problem and where it go,dont have for this model a pcb layout. here is a photo from U2 missing pin and here how i protect CPU and RAM https://ibb.co/HYQ2RJt Last edited by edin2008; 07-08-2020 at 10:31.

07-08-2020, 10:37	#2 (permalink)
edin2008 Insane Poster Join Date: Jan 2014 Posts: 77 Member: 2114773 Status: Offline Thanks Meter: 20	here is a photo from U2 missing pin https://ibb.co/5nHPYpn

07-08-2020, 10:57	#3 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	check image for print missing and try a jumper .. ipad 2 air.JPG

07-08-2020, 14:54	#6 (permalink)
chand_gee Moderator Join Date: Jan 2008 Location: <jeddah al saudia> Age: 36 Posts: 2,261 Member: 668050 Status: Offline Sonork: 100.1656307 Thanks Meter: 991	yes ipad must be detected in dfu mode without nand ic.. here is software you can use for https://phoneboard.co/