IPhone 6 no touch even after replacing both touch IC's - GSM-Forum

Mobilerepair111 · 05-31-2017, 12:43

hi guys

i have an iphone 6 touch issue, no water damage but maybe dropped not sure
what done so far

replacing U2401, U2402,U1501, checking voltages all present only one voltage is missing PP5V1_GRAPE_VDDH also there is no short or low reading on this line and i checked from under U1501 to under U2401 and it's connected, any idea please?

thanks

gulzaib07 · 05-31-2017, 13:14

check all capastors between the touch ics...you will find solution

Mobilerepair111 · 05-31-2017, 14:10

Do you think the 5V for PP5v1_GRAPE_VDDH is missing because of those IC's? Anyway will check tomorrow morning hope i find a faulty cap there

ctccellulaire · 05-31-2017, 20:22

Quote:

Originally Posted by Mobilerepair111

hi guys

i have an iphone 6 touch issue, no water damage but maybe dropped not sure
what done so far

replacing U2401, U2402,U1501, checking voltages all present only one voltage is missing PP5V1_GRAPE_VDDH also there is no short or low reading on this line and i checked from under U1501 to under U2401 and it's connected, any idea please?

thanks

if you tried all and nothing reball CPU A8 Chip 100% done
Regards

Sent from my SM-G935F using Tapatalk

Mobilerepair111 · 06-01-2017, 14:26

Quote:

Originally Posted by gulzaib07

check all capastors between the touch ics...you will find solution

Should i ise diod mode to check them?

Mobilerepair111 · 06-03-2017, 10:11

just checked and found these voltages PP1V8_GRAPE and PP_CUMULUS_VDDCORE and PP_CUMULUS_VDDANA are missing i checked the lines no short or low readings so i reball and replaced the Power ic but still no PP1V8_GRAPE.

any Ideas???

vinse · 06-03-2017, 11:23

hello did you repeal and replace your PMIC or juste reball and replace ??
(to make that touch work again ;-p)

vinse · 06-03-2017, 11:35

for the PP1V8_GRAPE it can be the U2403 shorted or bad or your cumulus shorted or bad

check also your CUMULUS_TO_PROX_TX_EN_BUFF on Q1101 and R2407 near the U2403

Mobilerepair111 · 06-04-2017, 06:55

U2403 and U2401 been replaced still no touch

mustafa12 · 09-14-2017, 21:38

i have 3 iphone 6 the same problem no touch screen
i changed u1501 and both ic touch
but not solution
pp 5v1 grape is 0v

peak_mobile · 09-16-2017, 04:13

Check

CUMULUS_TO_SAGE_BOOST_CLK_EN
TOUCH_TO_SAGE_VCM_IN_CONN

05-31-2017, 12:43	#1 (permalink)
Mobilerepair111 Freak Poster Join Date: Dec 2016 Posts: 117 Member: 2656737 Status: Offline Thanks Meter: 12	IPhone 6 no touch even after replacing both touch IC's hi guys i have an iphone 6 touch issue, no water damage but maybe dropped not sure what done so far replacing U2401, U2402,U1501, checking voltages all present only one voltage is missing PP5V1_GRAPE_VDDH also there is no short or low reading on this line and i checked from under U1501 to under U2401 and it's connected, any idea please? thanks

06-03-2017, 11:35	#8 (permalink)
vinse Freak Poster Join Date: Jan 2014 Posts: 258 Member: 2106911 Status: Offline Thanks Meter: 67	for the PP1V8_GRAPE it can be the U2403 shorted or bad or your cumulus shorted or bad check also your CUMULUS_TO_PROX_TX_EN_BUFF on Q1101 and R2407 near the U2403 Last edited by vinse; 06-03-2017 at 11:45.

05-31-2017, 13:14	#2 (permalink)
gulzaib07 Freak Poster Join Date: Dec 2013 Posts: 230 Member: 2092009 Status: Offline Thanks Meter: 30	check all capastors between the touch ics...you will find solution

05-31-2017, 14:10	#3 (permalink)
Mobilerepair111 Freak Poster Join Date: Dec 2016 Posts: 117 Member: 2656737 Status: Offline Thanks Meter: 12	Do you think the 5V for PP5v1_GRAPE_VDDH is missing because of those IC's? Anyway will check tomorrow morning hope i find a faulty cap there

06-03-2017, 10:11	#6 (permalink)
Mobilerepair111 Freak Poster Join Date: Dec 2016 Posts: 117 Member: 2656737 Status: Offline Thanks Meter: 12	just checked and found these voltages PP1V8_GRAPE and PP_CUMULUS_VDDCORE and PP_CUMULUS_VDDANA are missing i checked the lines no short or low readings so i reball and replaced the Power ic but still no PP1V8_GRAPE. any Ideas???

06-03-2017, 11:23	#7 (permalink)
vinse Freak Poster Join Date: Jan 2014 Posts: 258 Member: 2106911 Status: Offline Thanks Meter: 67	hello did you repeal and replace your PMIC or juste reball and replace ?? (to make that touch work again ;-p)

06-04-2017, 06:55	#9 (permalink)
Mobilerepair111 Freak Poster Join Date: Dec 2016 Posts: 117 Member: 2656737 Status: Offline Thanks Meter: 12	U2403 and U2401 been replaced still no touch

09-14-2017, 21:38	#10 (permalink)
mustafa12 Insane Poster Join Date: Dec 2009 Posts: 74 Member: 1191636 Status: Offline Thanks Meter: 6	i have 3 iphone 6 the same problem no touch screen i changed u1501 and both ic touch but not solution pp 5v1 grape is 0v

09-16-2017, 04:13	#11 (permalink)
peak_mobile Junior Member Join Date: Feb 2013 Location: Thailand Posts: 16 Member: 1888732 Status: Offline Sonork: 100.1650794 Thanks Meter: 2	Check CUMULUS_TO_SAGE_BOOST_CLK_EN TOUCH_TO_SAGE_VCM_IN_CONN