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2014년 9월 19일에 출시된 이 4.7” 스크린 iPhone은 iPhone 6 Plus의 작은 버전입니다. 모델 번호 A1549, A1586 및 A1589로 식별됩니다.

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How to check line vcc main and vdd main?

Hello my friends,

I want to learn for iphone 6 how to check vcc main and vdd main line?

- Should the phone be connected to a power supplay?

- how is the voltage measured?

Thank you......

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Thank you my friends

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I always start by checking the main power rails with the device unpowered. That allows me to check to see if they are shorted to ground. I will normally do this on VCC_MAIN, BATT_VCC and PP5V0_USB. If those rails are not shorted, then I will connect the battery and USB charger and test those rails for proper voltage.

If all of those rails are okay and the device still doesn't power on, then I test the output rails generated by the PMIC. I will usually do the same for those by starting with an unpowered device (check for shorts) and then powered up so I can test for voltages.

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Hi

You say

"I always start by checking the main power rails with the device unpowered. That allows me to check to see if they are shorted to ground. I will normally do this on VCC_MAIN, BATT_VCC and PP5V0_USB"

You cant test VCC_MAIN, BATT_VCC and PP5V0_USB if you dont vconnect charger.

Can you be more specific ? Thanks

I check them with a multimeter to see if they are shorted to ground. There's no point in applying power if the line is shorted, you will only cause more damage.

Yes, but how to test 5V0 if no power applyed ?

BTW This is not mine primary concern .

I have Iphone 6 with 0V on VCC Main but there is no short at all

I check for Short PP_VBAT_MAIN nothing

Before i connect flex charger output is 5.0v , after i connect to J1817 i get 2.60V. at PP5V0_USB pin (its weird really wird) - C1812 is OK

Hear is Photo of problem

https://s8.postimg.cc/olm0a2b05/Fast_Sto...

Any Suggestion ?

If the voltage drops to 2.6V when you connect something, then there is clearly a partial short.

I am not suggesting you measure voltage with no power applied. I am suggesting you check for shorts/diode mode all the main rails before you apply power. If they aren't shorted, then you apply power and measure voltages.

Its strange. Not hot spot either on PCB

I though to apply Slowly from 1-2v at 2A on VCC Main and check for possible hot or burn. But asking you as expert before i try this do you have any suggestion what can be from your experience ?

Thanks

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What is fulform PP5V0_USBVCC_MAIN, BATT_VCC and PP5V0_USB" please tell me I want to know and also

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