iphone 5 no power on but L2 heats up - GSM-Forum

x-33 · 10-25-2014, 23:26

Hi guys, I could use a little help with this one. Iphone 5 with very very little water damage, mostly in not significant areas. Cleaned it up anyway.

It doesn't turn on but when connected to power I noticed the L2 coil getting really hot. The meter shows a short between pin 2 of the coil and ground. I was hoping it could be the zenner diode D7 but no luck...

It looks like the U7 might be the culprit as the short leads straight to CHG_LX (pins H1 and H2 on U7). Is my assumption correct?

Has anybody else dealt with this issue before?

As a last resort I will disconnect L2 to prevent the VCC Main to get to CHG_LX just to see if the phone comes back to life, as this short is apparently killing the main voltage.

Any help is really appreciated!

Thank you

PS: already tried: different battery, charge port assy, screen etc

x-33 · 10-26-2014, 13:45

I have disconnected L2 and no luck. To my surprise, the short is still there but in front of L2.

This means something on PP VCC MAIN is shorting out, but this doesn't explain why L2 heats up when in circuit ????!!!

Anybody??? Please help!!! This doesn't make any sense...

ayme.32 · 11-24-2014, 16:22

I have same problem with an iPhone 5, water damage, no power, L2 coil is hot !

mindafuttu · 07-04-2015, 18:21

Hi, I have an iPhone 5, water damage, no power, L2 coil is hot, and the near caps in short... Can we help?

jackie8 · 07-04-2015, 19:49

here is a picture. Red marked pins are all conected to this line and can be short. Start with inspecting those caps under the microscope.

blaiseid · 07-04-2015, 20:09

Hi Jackie, may you supply us with full diagrams of shorts or positive ways of iphone5 or higher?

Tx

kaptanci · 07-04-2015, 23:13

u have to make observation under the scope but from my experience it is mostly the nearest cap to the heating ic which has short.

leenguyen · 01-12-2016, 05:51

huzm , question ipad 3 problem of everyone , why? iphone problem in page ? i don't understand

10-25-2014, 23:26	#1 (permalink)
x-33 Crazy Poster Join Date: Apr 2009 Posts: 52 Member: 1016641 Status: Offline Thanks Meter: 11	iphone 5 no power on but L2 heats up Hi guys, I could use a little help with this one. Iphone 5 with very very little water damage, mostly in not significant areas. Cleaned it up anyway. It doesn't turn on but when connected to power I noticed the L2 coil getting really hot. The meter shows a short between pin 2 of the coil and ground. I was hoping it could be the zenner diode D7 but no luck... It looks like the U7 might be the culprit as the short leads straight to CHG_LX (pins H1 and H2 on U7). Is my assumption correct? Has anybody else dealt with this issue before? As a last resort I will disconnect L2 to prevent the VCC Main to get to CHG_LX just to see if the phone comes back to life, as this short is apparently killing the main voltage. Any help is really appreciated! Thank you PS: already tried: different battery, charge port assy, screen etc

10-26-2014, 13:45	#2 (permalink)
x-33 Crazy Poster Join Date: Apr 2009 Posts: 52 Member: 1016641 Status: Offline Thanks Meter: 11	I have disconnected L2 and no luck. To my surprise, the short is still there but in front of L2. This means something on PP VCC MAIN is shorting out, but this doesn't explain why L2 heats up when in circuit ????!!! Anybody??? Please help!!! This doesn't make any sense...

11-24-2014, 16:22	#3 (permalink)
ayme.32 Insane Poster Join Date: Oct 2010 Location: France Age: 26 Posts: 74 Member: 1416195 Status: Offline Sonork: 100.13966 Thanks Meter: 8	I have same problem with an iPhone 5, water damage, no power, L2 coil is hot !

07-04-2015, 18:21	#4 (permalink)
mindafuttu Junior Member Join Date: Mar 2014 Posts: 29 Member: 2157325 Status: Offline Thanks Meter: 4,294,967,295	Hi, I have an iPhone 5, water damage, no power, L2 coil is hot, and the near caps in short... Can we help?

07-04-2015, 19:49	#5 (permalink)
jackie8 Freak Poster Join Date: Jan 2014 Location: Germany Posts: 244 Member: 2105007 Status: Offline Thanks Meter: 40	here is a picture. Red marked pins are all conected to this line and can be short. Start with inspecting those caps under the microscope.

07-04-2015, 20:09	#6 (permalink)
blaiseid No Life Poster Join Date: Aug 2003 Location: Town City Age: 54 Posts: 3,485 Member: 37735 Status: Offline Sonork: 100.103255 Thanks Meter: 205	Hi Jackie, may you supply us with full diagrams of shorts or positive ways of iphone5 or higher? Tx

07-04-2015, 23:13	#7 (permalink)
kaptanci Freak Poster Join Date: Nov 2014 Location: Germany Posts: 265 Member: 2289832 Status: Offline Thanks Meter: 48	u have to make observation under the scope but from my experience it is mostly the nearest cap to the heating ic which has short.

01-12-2016, 05:51	#8 (permalink)
leenguyen Junior Member Join Date: Jan 2016 Posts: 1 Member: 2514504 Status: Offline Thanks Meter: 0	huzm , question ipad 3 problem of everyone , why? iphone problem in page ? i don't understand