iPhone 6 short on Vcc tips needed - Page 2 - GSM-Forum

short_toground · 08-30-2016, 03:02

So is vdd_main the same voltage as vcc_main? It shows them connected together so it's a little confusing

Kradziej · 08-30-2016, 04:03

Quote:

Originally Posted by short_toground

So is vdd_main the same voltage as vcc_main? It shows them connected together so it's a little confusing

yes they are connected, vdd_main is input, it gets power from vcc_main which is powered by battery or by tigris buck converter

you really need some basics about circuits and how they works or else you will never understand anything i write

short_toground · 08-30-2016, 13:43

Thanks for your help I appreciate it. Apple's schematics tend to confuse me a bit because I'm used to seeing all inputs to the left and outputs to the right of a circuit but they like to put them in anywhere there's space on the page it seems so throws me off

x2xx2x · 08-30-2016, 23:08

Thank you for all your writes. Where can we learn it can you advice good source to us? Thnks repair whatsapp group may be we can create than we can send us experience.

Arie_mediafone · 08-31-2016, 20:36

Its too dificuly to find short on vcc_main
My advice open scheme search vcc_main find the Cap 10U just Capasitor not ic good luck im haved done many

warboat · 09-05-2016, 00:05

You should not bench power thru battery connector to find short on VCC_main because Q1403 will sink a lot of the power and be the hottest and make the real short less apparent. Power VCC_main after Q1403 and take Q1403 out of the equation and reduce the stress on it when finding short on VCC

marcelbr · 03-04-2017, 02:31

my batt_vcc is oscilating between 2v14 to 4v14 that could be a faulty q1403?
also have pp3v3 acc =0v that could be faulty pmic?

Jojo83 · 03-14-2017, 21:51

For batt_vcc the voltage are normal

yaronc31 · 03-16-2017, 08:45

Byspass q1403 and see what hot also chaeck cap near ic light

08-30-2016, 03:02	#16 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	So is vdd_main the same voltage as vcc_main? It shows them connected together so it's a little confusing

08-30-2016, 13:43	#18 (permalink)
short_toground No Life Poster Join Date: Jul 2016 Posts: 536 Member: 2598526 Status: Offline Thanks Meter: 52	Thanks for your help I appreciate it. Apple's schematics tend to confuse me a bit because I'm used to seeing all inputs to the left and outputs to the right of a circuit but they like to put them in anywhere there's space on the page it seems so throws me off

08-30-2016, 23:08	#19 (permalink)
x2xx2x Freak Poster Join Date: Nov 2015 Posts: 161 Member: 2484955 Status: Offline Thanks Meter: 14	Thank you for all your writes. Where can we learn it can you advice good source to us? Thnks repair whatsapp group may be we can create than we can send us experience.

08-31-2016, 20:36	#20 (permalink)
Arie_mediafone Junior Member Join Date: Mar 2008 Posts: 8 Member: 732320 Status: Offline Thanks Meter: 0	Its too dificuly to find short on vcc_main My advice open scheme search vcc_main find the Cap 10U just Capasitor not ic good luck im haved done many

09-05-2016, 00:05	#21 (permalink)
warboat Insane Poster Join Date: May 2013 Posts: 75 Member: 1929960 Status: Offline Thanks Meter: 27	You should not bench power thru battery connector to find short on VCC_main because Q1403 will sink a lot of the power and be the hottest and make the real short less apparent. Power VCC_main after Q1403 and take Q1403 out of the equation and reduce the stress on it when finding short on VCC

03-04-2017, 02:31	#22 (permalink)
marcelbr Junior Member Join Date: Feb 2015 Location: Brazil SC Posts: 4 Member: 2353077 Status: Offline Thanks Meter: 0	my batt_vcc is oscilating between 2v14 to 4v14 that could be a faulty q1403? also have pp3v3 acc =0v that could be faulty pmic?

03-14-2017, 21:51	#23 (permalink)
Jojo83 Freak Poster Join Date: Feb 2017 Location: Earth Posts: 207 Member: 2681768 Status: Offline Thanks Meter: 30	For batt_vcc the voltage are normal

03-16-2017, 08:45	#24 (permalink)
yaronc31 Junior Member Join Date: Jan 2009 Posts: 17 Member: 954421 Status: Offline Thanks Meter: 2	Byspass q1403 and see what hot also chaeck cap near ic light