Iphone 5c clock and time problem - GSM-Forum

nAthOs · 09-16-2017, 11:48

Hi there,
I have an iphone 5c with the common time and clock issue.
I changed the Y2 quartz for a new one with no result, i tried to re-hot the wifi and the U7 chips and it changed nothing too.
My question is, does this Y2 quartz component have a single direction to solder it or can it be soldered in both ways ?
What can i check now and how to check it, knowing that i’m not a pro so my equipment is not pro too, but i have an electronic microscope, a multimeter and all the needed shematics.
Thanks a lot for your help

Raainxx · 09-16-2017, 18:20

Test each pin of Y2 in diode mode (if you have near 0.45) Y2 is connect to U7 else you have a bad solder under U7.

nAthOs · 09-17-2017, 18:20

Hi and thanks for your help.
In diode mode, when i put the black wire on one side of the Y2 component and the red wire one the other side, i have nothing, no continuity.
When i put the black on ground and the red on each side of Y2, i have nothing too.
Any idea ?

reddemonic · 09-17-2017, 18:23

diode mode, red on ground, black on Y2 pins.

diode mode is not for continuity.

nAthOs · 09-17-2017, 19:55

Ok, as my multimeter says 1 on diode mode and 000 when touching the probes, i thought it can be used to test continuity.
Whatever, when i put red on ground and black on Y2, the multimeter says 690/700 on each pins.
Is it what i should have ?

Raainxx · 09-17-2017, 20:26

ok it's good y2 is connected to U7, i think it's bad Y2 or bad solder.

orx · 09-17-2017, 20:48

Check also C251 and C263

ip5c chrystal.JPG

nAthOs · 09-17-2017, 21:20

Ok, thanks for your answer guys.
Could you explain me quickly how to test c251 and c263 with a multimeter ?
Does Y2 could have been soldered in the wrong direction ?

orx · 09-17-2017, 22:17

Check with multimeter in continuity if beep mean short so faulty.

nAthOs · 09-18-2017, 21:52

C251 and C263 were good, that was just a bad solder of Y2.
Thanks all for your help.

adigsm2006 · 04-19-2018, 22:18

Quote:

Originally Posted by nAthOs

C251 and C263 were good, that was just a bad solder of Y2.
Thanks all for your help.

What's Y2 ?
Thanks !

09-16-2017, 11:48	#1 (permalink)
nAthOs Crazy Poster Join Date: Sep 2017 Posts: 54 Member: 2757091 Status: Offline Thanks Meter: 0	Iphone 5c clock and time problem Hi there, I have an iphone 5c with the common time and clock issue. I changed the Y2 quartz for a new one with no result, i tried to re-hot the wifi and the U7 chips and it changed nothing too. My question is, does this Y2 quartz component have a single direction to solder it or can it be soldered in both ways ? What can i check now and how to check it, knowing that i’m not a pro so my equipment is not pro too, but i have an electronic microscope, a multimeter and all the needed shematics. Thanks a lot for your help

09-16-2017, 18:20	#2 (permalink)
Raainxx Junior Member Join Date: Mar 2016 Posts: 29 Member: 2546098 Status: Offline Thanks Meter: 3	Test each pin of Y2 in diode mode (if you have near 0.45) Y2 is connect to U7 else you have a bad solder under U7.

09-17-2017, 18:20	#3 (permalink)
nAthOs Crazy Poster Join Date: Sep 2017 Posts: 54 Member: 2757091 Status: Offline Thanks Meter: 0	Hi and thanks for your help. In diode mode, when i put the black wire on one side of the Y2 component and the red wire one the other side, i have nothing, no continuity. When i put the black on ground and the red on each side of Y2, i have nothing too. Any idea ?

09-17-2017, 18:23	#4 (permalink)
reddemonic Major Poster Join Date: Jul 2014 Posts: 47 Member: 2228871 Status: Offline Thanks Meter: 8	diode mode, red on ground, black on Y2 pins. diode mode is not for continuity.

09-17-2017, 19:55	#5 (permalink)
nAthOs Crazy Poster Join Date: Sep 2017 Posts: 54 Member: 2757091 Status: Offline Thanks Meter: 0	Ok, as my multimeter says 1 on diode mode and 000 when touching the probes, i thought it can be used to test continuity. Whatever, when i put red on ground and black on Y2, the multimeter says 690/700 on each pins. Is it what i should have ?

09-17-2017, 20:26	#6 (permalink)
Raainxx Junior Member Join Date: Mar 2016 Posts: 29 Member: 2546098 Status: Offline Thanks Meter: 3	ok it's good y2 is connected to U7, i think it's bad Y2 or bad solder.

09-17-2017, 20:48	#7 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	Check also C251 and C263 ip5c chrystal.JPG

09-17-2017, 21:20	#8 (permalink)
nAthOs Crazy Poster Join Date: Sep 2017 Posts: 54 Member: 2757091 Status: Offline Thanks Meter: 0	Ok, thanks for your answer guys. Could you explain me quickly how to test c251 and c263 with a multimeter ? Does Y2 could have been soldered in the wrong direction ?

09-17-2017, 22:17	#9 (permalink)
orx No Life Poster Join Date: Oct 2012 Location: Republic of Serenissima Posts: 1,516 Member: 1825965 Status: Offline Thanks Meter: 874	Check with multimeter in continuity if beep mean short so faulty.

09-18-2017, 21:52	#10 (permalink)
nAthOs Crazy Poster Join Date: Sep 2017 Posts: 54 Member: 2757091 Status: Offline Thanks Meter: 0	C251 and C263 were good, that was just a bad solder of Y2. Thanks all for your help.