iPhone 4S shorted caps! - GSM-Forum

gustavogomesbr · 03-24-2014, 20:52

After re-heating a 4S board to fix the audio IC issue(mic not working properly on calls), the iphone is not turning on and PMIC is getting hot, tested for continuity on caps and looks like a lot of them are shorted to ground.

What could gone wrong? I heated the board slowly and protected all else with kapton tape.

Just changing the caps would do the job? Why they are shorted?

Anyone already manage to solvi this kind of issue?

gustavogomesbr · 03-24-2014, 21:08

Forgot to mention I´m using the multimeter on the diode/continuity/beep to check if caps are shorted, is that correct?

Some caps that beep are C274, C275, C281, C126_RF, C154_RF, C152_RF, C211_RF

gustavogomesbr · 03-24-2014, 21:11

on the opposite side C700, C219, C130, C218, C169 also beep

gustavogomesbr · 03-26-2014, 21:54

Anyone willing to help me?

aristo1963 · 03-26-2014, 22:50

Reball your PMIC ,sounds like you got it to hot and have a short.

03-24-2014, 20:52	#1 (permalink)
gustavogomesbr Junior Member Join Date: Apr 2013 Posts: 20 Member: 1927307 Status: Offline Thanks Meter: 3	iPhone 4S shorted caps! After re-heating a 4S board to fix the audio IC issue(mic not working properly on calls), the iphone is not turning on and PMIC is getting hot, tested for continuity on caps and looks like a lot of them are shorted to ground. What could gone wrong? I heated the board slowly and protected all else with kapton tape. Just changing the caps would do the job? Why they are shorted? Anyone already manage to solvi this kind of issue?

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03-24-2014, 21:08	#2 (permalink)
gustavogomesbr Junior Member Join Date: Apr 2013 Posts: 20 Member: 1927307 Status: Offline Thanks Meter: 3	Forgot to mention I´m using the multimeter on the diode/continuity/beep to check if caps are shorted, is that correct? Some caps that beep are C274, C275, C281, C126_RF, C154_RF, C152_RF, C211_RF

03-24-2014, 21:11	#3 (permalink)
gustavogomesbr Junior Member Join Date: Apr 2013 Posts: 20 Member: 1927307 Status: Offline Thanks Meter: 3	on the opposite side C700, C219, C130, C218, C169 also beep

03-26-2014, 21:54	#4 (permalink)
gustavogomesbr Junior Member Join Date: Apr 2013 Posts: 20 Member: 1927307 Status: Offline Thanks Meter: 3	Anyone willing to help me?

03-26-2014, 22:50	#5 (permalink)
aristo1963 Junior Member Join Date: Aug 2013 Location: North Carolina Age: 60 Posts: 4 Member: 2011043 Status: Offline Thanks Meter: 0	Reball your PMIC ,sounds like you got it to hot and have a short.