Iphone 4 touch sreen not working !!!

[MrNam]

I checked on the main, it takes 1.8 v.From B2 ic power to R14 of the touch screen.it connected very well, I had to replace power ic but not effective.solution give problems for me????

http://uphinh.ssc.vn/images/124iphone_4_board.jpg

[XMobileX]

Change the Texas Instrument Touchscreen Controller......

[MrNam]

Originally Posted by XMobileX

Change the Texas Instrument Touchscreen Controller......

Thanks.i have change but not ok!!! haizz

[Levani_Pmic]

Originally Posted by MrNam

I checked on the main, it takes 1.8 v.From B2 ic power to R14 of the touch screen.it connected very well, I had to replace power ic but not effective.solution give problems for me????

http://uphinh.ssc.vn/images/124iphone_4_board.jpg

friend also try change quartz Y1_pmu(near pmic).
to change quartz, when touchscreen does't work it's well known solution

[MrNam]

Originally Posted by mkleli55

friend also try change quartz Y1_pmu(near pmic).
to change quartz, when touchscreen does't work it's well known solution

thanks you,but i have change.problems the main is loss 1,8 v.I try to check everything, but nothing unusual.replace ic touchsreen,ic power,quartz but still loss 1,8 v