There is no voltage output from battery connector of the logic board.

Question

iPhone 6

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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Piyush Singh @piycalush

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게시일: 2018년 3월 22일

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There is no voltage output from battery connector of the logic board.

Phone was working fine but all of a sudden it went blank.tried everything to start it,like hard restart, dfu but its all black. Checked battery and output is fine, checked battery connector on the board and there is no output from the left pin. Can you let me know what can be done to pin point the issue.

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Minho @refectio

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게시일: 2018년 3월 23일

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You won't be able to see any voltage from the battery connector unless the phone is booted.

If you connect your phone to iTunes, is it recognized? If it is then your problem may be backlight related. If it isn't then you have to view this through the lens of "dead board".

You have to find and measure the main voltage rails to check for shorts (first) and then for voltage if there are no shorts. Search Google for the schematics/boardviews and start probing.

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i'm able to resolve the issue but dont have required instruments to place new C5202_RF in my iphone 6.

if i dont put it then what is the consequences??

Piyush Singh 의 2018년 5월 12일

C5202_RF is a bypass capacitor. When powered, it stores an electrical charge that can be used to supply current on a moments notice whenever the IC, in this case the WLAN IC, needs it. Normally the power supply would do this but due to parasitic inductance, it can’t respond quickly enough. Having the bypass capacitor right next to the IC, it can supply the peak current required. The other effect is that it filters the line from noise called ringing (caused by high frequency switching), which can have crippling effects all over the circuit board. That's the theory...

In practice, the phone will probably work fine without it but if the WiFi/BT behaves erratically, it will be because of the missing cap. If you are offering a repair service for a customer, you should be replacing it otherwise you're only doing half the job. If it's your own personal device, then leave it out and see how the phone behaves.

Minho 의 2018년 5월 12일

Thanks minho for the deep in explanation, this is for my personal use,i'm not providing any repairing service.

I will post here if i see any weird behave in my cell phone.

Have a nice day and again thanks a ton for your time.

Piyush Singh 의 2018년 5월 12일

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i'm able to resolve the issue but dont have required instruments to place new C5202_RF in my iphone 6.

if i dont put it then what is the consequences?? — Piyush Singh
C5202_RF is a bypass capacitor. When powered, it stores an electrical charge that can be used to supply current on a moments notice whenever the IC, in this case the WLAN IC, needs it. Normally the power supply would do this but due to parasitic inductance, it can’t respond quickly enough. Having the bypass capacitor right next to the IC, it can supply the peak current required. The other effect is that it filters the line from noise called ringing (caused by high frequency switching), which can have crippling effects all over the circuit board. That's the theory...

In practice, the phone will probably work fine without it but if the WiFi/BT behaves erratically, it will be because of the missing cap. If you are offering a repair service for a customer, you should be replacing it otherwise you're only doing half the job. If it's your own personal device, then leave it out and see how the phone behaves. — Minho
Thanks minho for the deep in explanation, this is for my personal use,i'm not providing any repairing service.

I will post here if i see any weird behave in my cell phone.

Have a nice day and again thanks a ton for your time. — Piyush Singh

iPhone 6

There is no voltage output from battery connector of the logic board.

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