iPhone 6 plus - Not turning on!! Help

[esko1]

Hi. I really need help this time. I have iPhone 6 plus from my customer with very important data. iPhone is not powering on. When inserted on charger it draws 0.49A from it. PC won't detect it also.

What I have done so far:

- Changed big power IC (U1202)
- Changed u2 ic (u1700)
- Changed u1401

Checked all caps for short but all ok. No water damage signs also.

Lines that I have tested, and have power:
PP3V0_NAND
PP1V8
PP1V2_NAND_VDDI
PP_VCC_MAIN
PP_CPU
PP_LCM_BL_ANODE

When I got phone, PC was detecting it, but clack screen, then after I remove the shields it wen't completely dead, and this is not first time I have removed it, so that should not be a problem.

Does someone have any advice. I really need help here. Thank in advance

[esko1]

As I expected...thanks for "help"

[esko1]

Originally Posted by wizz25

solution camera iphone 6s !!!

This problem is on iphone 6 not 6s.

[esko1]

So no help here...Does anybody knows for a good forum where users actually help you?

[nik001]

Have you check Q1701 fuse?

Q1403?

If U1202 and U1700 works it should work? check if Touchscreen ic is corroded?

is your logicboard getting little bit warm?

what is your voltage on PP_VCC_MAIN, and the others...?

[esko1]

Originally Posted by nik001

Have you check Q1701 fuse?

Q1403?

If U1202 and U1700 works it should work? check if Touchscreen ic is corroded?

is your logicboard getting little bit warm?

what is your voltage on PP_VCC_MAIN, and the others...?

I have checked q1701 fuse and it's ok. I have changed q1403 also but it's the same. I get all correct voltage. Logic board is not getting worm. I have changed Touchscreen ic in the first place. Customer said that lcd was flickering and after time lcd went completely blank. I know that this is the problem in touchscreen ic, but I have changed it many times and repaired phone but in this one when I removed shields and changed touchscreen ic, phone died. It draws 0,49A from charger but not powering on.

I have 1.8v on BUTTON_TO_AP_HOLD_KEY_CONN_L also. I really don't know what can be a problem. It is possible that I overheated CPU. I'm working with small nozzle and max 370c. How can I know that CPU is overheated?

[nik001]

No i think its not the CPU, this would be overheating... have you check your cpu ? you can check it on the voltage 1,2 volt ....

but first check please the c1700 and c1704 and give me the voltage...?

[esko1]

Originally Posted by nik001

No i think its not the CPU, this would be overheating... have you check your cpu ? you can check it on the voltage 1,2 volt ....

but first check please the c1700 and c1704 and give me the voltage...?

nik001 thank you for you time. I have checked c1700 and c1704

c1700...3.0v
c1704...4.78v

I really hope that CPU is not overheated.

[nik001]

Originally Posted by esko1

nik001 thank you for you time. I have checked c1700 and c1704

c1700...3.0v
c1704...4.78v

I really hope that CPU is not overheated.

yea the voltages are ok, have you checked up C5202_RF very important, check it up and give feedback...its near the wifi chip

[esko1]

Originally Posted by nik001

yea the voltages are ok, have you checked up C5202_RF very important, check it up and give feedback...its near the wifi chip

I have checked...4,12V

[nik001]

its also ok....

check all near the pmic

C0508 should 0,8 V
c1243 1,8 v
c0429 1,2 v
c0435 0,9 v

near flash
c0634 3 v
c0615 1,2 v
c0616 1,8 v
c0468 0,8 for PP_CPU

[suxito]

I have the exactly same problem with an i6+ here and I tried almost everything =( stuck at 0.05a and remains there.

I noticed that a hard reset with power+home buttons works, so the cpu its working properly but might be a problem with the emmc (hdd)

Did you solve it?

[esko1]

Originally Posted by suxito

I have the exactly same problem with an i6+ here and I tried almost everything =( stuck at 0.05a and remains there.

I noticed that a hard reset with power+home buttons works, so the cpu its working properly but might be a problem with the emmc (hdd)

Did you solve it?

No I have never solved it. I have now two iphone 6 plus with the same symptoms. Everything is looking good, cpu and pm ic is worm, and phone is drawing 0.49A from charger, but pc is not detecting it and screen is black.

Any solution for this?

[esko1]

ok I have now three iphones with the same error. PC not detecting it, I got 0.9v,1.2v, 1.5v, 1.8v, 3v...from Power IC, CPU and power ic is worm but, screen blank, draws 0.49A from charger...wtf is happening?

[gyurma85]

same problem! did you try to reball the nand?