iPhone 6 no short no power - GSM-Forum

short_toground · 07-15-2016, 02:52

Have a water damaged iPhone 6 connected to external Power supply.

When powered on it draws 50ma but doesn't boot, iTunes doesn't detect it.

Any ideas? I have 4.25v vcc
CPU input voltage is .9v
Gpu voltage isn't there

What should I check?

jimchu316 · 07-15-2016, 03:33

Quote:

Originally Posted by short_toground

Have a water damaged iPhone 6 connected to external Power supply.

When powered on it draws 50ma but doesn't boot, iTunes doesn't detect it.

Any ideas? I have 4.25v vcc
CPU input voltage is .9v
Gpu voltage isn't there and caps c1227 and c1203 measure shorted

What should I check?

power on only 50ma,cpu no working.

to check cpu all the input voltage or PMU Voutput

short_toground · 07-15-2016, 03:54

Getting 0v at gpu and .9v at CPU

CPU A8 chip warm

jimchu316 · 07-15-2016, 06:24

Quote:

Originally Posted by short_toground

Getting 0v at gpu and .9v at CPU

CPU A8 chip warm

First to check PMU IC output 11 way voltages:

PP_CPU 0.775V-1.0V
PP_VAR_SOC 0.9V-0.95V
PP_GPU 0.9V-0.95V
PP1V8_SDRAM 1.8V CPU
PP1V2_SDRAM 1.2V CPU
PP0V95_FIXED_SOC 0.95V CPU
PP1V8 1.8V CPU
PP1V2 1.2V
PP1V2_OSCAR 1.2V
PP1V8_OSCAR 1.8V
PP1V8_GRAPE 1.8V

if all working fine, to check CPU 11 way voltages:

PP3V3-USB——A8 CPU
PP1V8_VA_L9_L67——U0900、U1601
PP3V0_TRISTAR——U1700 USB
PP3V0_IMU——U1901
PP3V0_NAND——U0604
PP3V3_ACC——U1700 USB
PP3V0_PROX_ALS——J111
PP1V0——A8 CPU
PP3V0_PROX_IRLED——J111
PP1V8_ALWAYS——A8 CPU
PP3V0_MESA——U2100

short_toground · 07-15-2016, 06:53

What's "MESA" chip? Is it fingerprint ic?

short_toground · 07-15-2016, 15:41

No voltage at PP_Gpu and only draws 58ma and doesn't boot, iTunes doesn't detect. Could it be PMU?

jimchu316 · 07-17-2016, 02:44

Quote:

Originally Posted by short_toground

No voltage at PP_Gpu and only draws 58ma and doesn't boot, iTunes doesn't detect. Could it be PMU?

check L1213 & L1214

if L1213， 1214 no fulty, remove them and check their resistances to GND

short_toground · 07-17-2016, 18:57

Quote:

Originally Posted by jimchu316

check L1213 & L1214

if L1213， 1214 no fulty, remove them and check their resistances to GND

They read 0 ohms in circuit. Caps c1203 and c1227 read shorted in circuit. What do you think?

jimchu316 · 07-18-2016, 06:17

Quote:

Originally Posted by short_toground

They read 0 ohms in circuit. Caps c1203 and c1227 read shorted in circuit. What do you think?

remove C1203 and C1227, and check angin.

or check all the Caps of PP_Gpu

tomerzhr · 07-18-2016, 12:43

replace c1203 and then check!

rasheedc007 · 07-18-2016, 15:41

which is c1203 ic pls explain...

mustafa12 · 07-20-2016, 06:09

i have same proplem iphone 6

short_toground · 07-26-2016, 17:32

Removed L1213 and L1213 found short on CPU side. Removed CPU short gone.

How do you remove all the underfill glue to reball?

ninos22 · 10-30-2016, 16:18

Quote:

Originally Posted by jimchu316

check L1213 & L1214

if L1213， 1214 no fulty, remove them and check their resistances to GND

I remove L1213 & L1214 and no short from any side.

Also I check voltage

07-15-2016, 02:52	#1 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	iPhone 6 no short no power Have a water damaged iPhone 6 connected to external Power supply. When powered on it draws 50ma but doesn't boot, iTunes doesn't detect it. Any ideas? I have 4.25v vcc CPU input voltage is .9v Gpu voltage isn't there What should I check? Last edited by short_toground; 07-15-2016 at 16:04.

07-15-2016, 03:54	#3 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	iPhone 6 no short no power Getting 0v at gpu and .9v at CPU CPU A8 chip warm

07-15-2016, 06:53	#5 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	iPhone 6 no short no power What's "MESA" chip? Is it fingerprint ic? Last edited by short_toground; 07-16-2016 at 13:25.

07-15-2016, 15:41	#6 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	iPhone 6 no short no power No voltage at PP_Gpu and only draws 58ma and doesn't boot, iTunes doesn't detect. Could it be PMU? Last edited by short_toground; 07-16-2016 at 13:26.

07-18-2016, 12:43	#10 (permalink)
tomerzhr Freak Poster Join Date: May 2012 Posts: 166 Member: 1760128 Status: Offline Thanks Meter: 56	replace c1203 and then check!

07-18-2016, 15:41	#11 (permalink)
rasheedc007 No Life Poster Join Date: Feb 2010 Location: india. kerala. Posts: 1,539 Member: 1245320 Status: Offline Sonork: 100.1612126 Thanks Meter: 140	which is c1203 ic pls explain...

07-20-2016, 06:09	#12 (permalink)
mustafa12 Insane Poster Join Date: Dec 2009 Posts: 74 Member: 1191636 Status: Offline Thanks Meter: 6	i have same proplem iphone 6

07-26-2016, 17:32	#13 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	Removed L1213 and L1213 found short on CPU side. Removed CPU short gone. How do you remove all the underfill glue to reball?