Ipad Air wont charging and turn on

Question

iPad Air 1

Apple released the slimmed-down, buffed up iPad Air on November 1, 2013 in a choice of Space Gray or Silver. It packs the custom A7 processor and ships in 16, 32, 64, and 128 GB configurations.

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Chulsunpark @cspark80

Rep: 23

2

Postado: 6 de mar de 2017

Opções

Ipad Air wont charging and turn on

Charger connected when not show any screen, not reponse

I checked rails

PP3V0_S2R_TRISTAR : 0v

PP1V8_S2R_TRISTAR : 0v

PPVBUS_PROT : 4.4v

Ppvbus e75 usb conn : 4.4v

Help me please

Sorry I cannot speak english well

I checked VCC MAIN

VCC MAIN : ALL 5.2V, NOT SHORT

and PP3V0_S2R_TRISTAR , PP1V8_S2R_TRISTAR line

checked

but all capacitor not short, volatage is 0

upload several pictures,

check please

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Pontuação 1

3 comentários

Add

WLED LX A,B : 5.2V (datasheet :20v)

PPLED OUT A,B : 5.2V (datasheet :20v)

PPLED OUT BACK REG : 5.2V(datasheet :20v)

Measured value is lower than the value of the Regulation

U8100 problem?

7 de mar de 2017 por Chulsunpark

Replace the tristar. It is very chipped and probable damaged.

7 de mar de 2017 por Gigabit87898

Check if the WLED and PPLED lines are shorted to vcc_main.

8 de mar de 2017 por Gigabit87898

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Solução escolhida

Minho @refectio

Rep: 221,4 mil

15

289

807

Postado: 6 de mar de 2017

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The TRISTAR voltages should not read 0V.

Those voltages are being driven by the PMIC (U8100). You will need to determine if the 0V, probably caused by a short somewhere along the line, is due to a faulty PMIC, faulty Tristar (U6000) or a bad capacitor along the line.

UPDATE (2017-03-07)

I saw your update on the measured voltages. It would appear that the LED Buck Converter is not doing its job. This is caused by either defective passive components, such as the coil and diode (these are easy to check), or it is a defective PMIC. Considering you have other voltage issues (i.e. Tristar), I would lean more towards the PMIC. However, given that the PMIC is much harder to replace, you could try changing Tristar first to see if that solves the problem.

I would also probe all of the output voltages on the PMIC to see if there are more problems.

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Pontuação 4

2 comentários:

Thank you for your kind reply. "What is mean I,E? I'll check it.

8 de mar de 2017 por Chulsunpark

Hi,

Can you explain or give me more information about the LED Buck Converter? What is this?

22 de ago de 2019 por Blashyrkh

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Add

WLED LX A,B : 5.2V (datasheet :20v)

PPLED OUT A,B : 5.2V (datasheet :20v)

PPLED OUT BACK REG : 5.2V(datasheet :20v)

Measured value is lower than the value of the Regulation

U8100 problem? — Chulsunpark
Replace the tristar. It is very chipped and probable damaged. — Gigabit87898
Thank you for your kind reply. "What is mean I,E? I'll check it. — Chulsunpark
Hi,

Can you explain or give me more information about the LED Buck Converter? What is this? — Blashyrkh

Gigabit87898 @gigabit87898 Rep: 16,1 mil 39 92 13 · Answer 1 · 2017-03-06T17:56:33-07:00

Gigabit87898 @gigabit87898

Rep: 16,1 mil

39

92

13

Postado: 6 de mar de 2017

Opções

Are those going into or coming out of the tristar? Test for vccmain, and short to ground on those pins. Also will it power up with a known good battery?

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1 comentário:

Thank you for your kind reply.

I'll check it.

8 de mar de 2017 por Chulsunpark

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