Iphone 6 discharges very fast when display is off - GSM-Forum

Gerula · 02-14-2018, 17:31

Hi,
I'm squeezing my brain with this iphone 6 which performs perfectly normal in all aspects except for the insanely high battery discharge with the display off.

Essentially if you browse the net using wifi you're going to get more battery time from it then if you leave it in standby, with mobile data and wifi off and all cloud stuff turned off.

Another thing worth mentioning is that the fingerprint is not working. The display assembly looks original and the owner has the purchase papers from the original owner, but the phone history is unknown. Tested it with two known good batteries, same deal.

I'm sure this is a hardware issue (IOS was already upgraded via DFU and whatnot). When turned off completely (via power button) it doesn't drain the battery at all.

Any advice would be greatly appreciated.

Gerula · 02-17-2018, 23:30

Any idea guys? I cannot figure out what could be shorted out to give this kind of behavior.

moding · 02-18-2018, 08:38

is the home button getting warm?
had this issue once, because of the short on the home button, but this one was getting a little bit warm,i could feel it with fingers.
maybe you could turn assistive touch on and then disconnect the home button, to see what happens then with this phone ...?

CDMA_RASHID · 02-18-2018, 10:42

Check for short on Mesa PP3V0 supply.

one of the possible suspect for battery drainage.

hope that helps.

tochits · 02-19-2018, 01:46

try to charge the phone while battery is disconnected.if the device reboot on apple logo
U2 ic is fine.if apple logo doesn't show ,change the U2 ic.
sometime when U2 IC damage it drain the battery even without using the device.

Gerula · 02-20-2018, 08:49

Thanks for the suggestions guys. The drain, whatever may cause it, happens only in standby. ( sometimes it's so bad that the back of this phone would get slightly warm). The home button isn't causing it, as I have already done tests with another complete display assembly, including a different home button and the issue was still present).

I will try later today to charge it without the battery and see what happens, but if the U2 IC was damaged shouldn't the abnormal battery drain happen also when using the phone?

Gerula · 02-22-2018, 13:52

A little update: after testing the U2 IC using the method suggested by tochits (seems OK) I put the patient in airplane mode (also making sure it doesn't try to sync anything and so on) and then measured the temperature on it's surface using an IR thermometer.

With about 22.5 degrees Celsius in the room, the coolest part of the damn thing is the home button (24 celsius). The highest temperature was measured on the back , the hot spot of 26.6 celsius being about 3cm lower from the main camera and 1cm right to the edge (with the back of the phone up).

That points out directly to the damn touchscreen controller! I've never messed with that one in any way, do you guys have any suggestions?

Gerula · 02-22-2018, 14:07

Btw, the touchscreen works as intended, no grey bar, response to touch is as good as in a new phone and so on.

Gerula · 02-26-2018, 18:23

Any suggestions except for replacing the touchscreen controller chip?

debeliamark · 10-19-2018, 05:34

Quote:

Originally Posted by Gerula

Hi,
I'm squeezing my brain with this iphone 6 which performs perfectly normal in all aspects except for the insanely high battery discharge with the display off.

Essentially if you browse the net using wifi you're going to get more battery time from it then if you leave it in standby, with mobile data and wifi off and all cloud stuff turned off.

Another thing worth mentioning is that the fingerprint is not working. The display assembly looks original and the owner has the purchase papers from the original owner, but the phone history is unknown. Tested it with two known good batteries, same deal.

I'm sure this is a hardware issue (IOS was already upgraded via DFU and whatnot). When turned off completely (via power button) it doesn't drain the battery at all.

Any advice would be greatly appreciated.

Do you resolve this iphone with high consumption on standby ?

NS2016 · 10-23-2018, 14:07

iphone 6 battry drain
change battry same
change u2 same
change tigris ic same
remove vcc main stone same
plz help its urgent

02-14-2018, 17:31	#1 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	Iphone 6 discharges very fast when display is off Hi, I'm squeezing my brain with this iphone 6 which performs perfectly normal in all aspects except for the insanely high battery discharge with the display off. Essentially if you browse the net using wifi you're going to get more battery time from it then if you leave it in standby, with mobile data and wifi off and all cloud stuff turned off. Another thing worth mentioning is that the fingerprint is not working. The display assembly looks original and the owner has the purchase papers from the original owner, but the phone history is unknown. Tested it with two known good batteries, same deal. I'm sure this is a hardware issue (IOS was already upgraded via DFU and whatnot). When turned off completely (via power button) it doesn't drain the battery at all. Any advice would be greatly appreciated.

02-17-2018, 23:30	#2 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	Any idea guys? I cannot figure out what could be shorted out to give this kind of behavior.

02-18-2018, 08:38	#3 (permalink)
moding Freak Poster Join Date: May 2008 Posts: 109 Member: 777576 Status: Offline Thanks Meter: 32	is the home button getting warm? had this issue once, because of the short on the home button, but this one was getting a little bit warm,i could feel it with fingers. maybe you could turn assistive touch on and then disconnect the home button, to see what happens then with this phone ...?

02-18-2018, 10:42	#4 (permalink)
CDMA_RASHID No Life Poster Join Date: Jul 2008 Location: Mumbai Age: 36 Posts: 1,023 Member: 821646 Status: Offline Thanks Meter: 507	Check for short on Mesa PP3V0 supply. one of the possible suspect for battery drainage. hope that helps.

02-19-2018, 01:46	#5 (permalink)
tochits Freak Poster Join Date: Sep 2008 Location: U.S.A Posts: 382 Member: 856640 Status: Offline Sonork: 100.1606320 Thanks Meter: 281	try to charge the phone while battery is disconnected.if the device reboot on apple logo U2 ic is fine.if apple logo doesn't show ,change the U2 ic. sometime when U2 IC damage it drain the battery even without using the device.

02-20-2018, 08:49	#6 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	Thanks for the suggestions guys. The drain, whatever may cause it, happens only in standby. ( sometimes it's so bad that the back of this phone would get slightly warm). The home button isn't causing it, as I have already done tests with another complete display assembly, including a different home button and the issue was still present). I will try later today to charge it without the battery and see what happens, but if the U2 IC was damaged shouldn't the abnormal battery drain happen also when using the phone?

02-22-2018, 13:52	#7 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	A little update: after testing the U2 IC using the method suggested by tochits (seems OK) I put the patient in airplane mode (also making sure it doesn't try to sync anything and so on) and then measured the temperature on it's surface using an IR thermometer. With about 22.5 degrees Celsius in the room, the coolest part of the damn thing is the home button (24 celsius). The highest temperature was measured on the back , the hot spot of 26.6 celsius being about 3cm lower from the main camera and 1cm right to the edge (with the back of the phone up). That points out directly to the damn touchscreen controller! I've never messed with that one in any way, do you guys have any suggestions?

02-22-2018, 14:07	#8 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	Btw, the touchscreen works as intended, no grey bar, response to touch is as good as in a new phone and so on.

02-26-2018, 18:23	#9 (permalink)
Gerula Major Poster Join Date: Feb 2010 Posts: 49 Member: 1234862 Status: Offline Thanks Meter: 8	Any suggestions except for replacing the touchscreen controller chip?

10-23-2018, 14:07	#11 (permalink)
NS2016 Junior Member Join Date: Jul 2016 Posts: 3 Member: 2597826 Status: Offline Thanks Meter: 1	iphone 6 battry drain change battry same change u2 same change tigris ic same remove vcc main stone same plz help its urgent