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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 05-31-2017, 12:43   #1 (permalink)
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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
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Old 05-31-2017, 13:14   #2 (permalink)
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check all capastors between the touch ics...you will find solution
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Old 05-31-2017, 14:10   #3 (permalink)
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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
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Old 05-31-2017, 20:22   #4 (permalink)
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Quote:
Originally Posted by Mobilerepair111 View Post
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

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Old 06-01-2017, 14:26   #5 (permalink)
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Quote:
Originally Posted by gulzaib07 View Post
check all capastors between the touch ics...you will find solution
Should i ise diod mode to check them?
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Old 06-03-2017, 10:11   #6 (permalink)
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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???
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Old 06-03-2017, 11:23   #7 (permalink)
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hello did you repeal and replace your PMIC or juste reball and replace ??
(to make that touch work again ;-p)
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Old 06-03-2017, 11:35   #8 (permalink)
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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.
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Old 06-04-2017, 06:55   #9 (permalink)
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U2403 and U2401 been replaced still no touch
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Old 09-14-2017, 21:38   #10 (permalink)
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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
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Old 09-16-2017, 04:13   #11 (permalink)
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CUMULUS_TO_SAGE_BOOST_CLK_EN
TOUCH_TO_SAGE_VCM_IN_CONN
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