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Go Back   GSM-Forum > GSM & CDMA Phones / Tablets Software & Hardware Area > iPhone ,iPod & iPad (Apple Inc. Products) > iPhone, iPad, iPod Hardware Repair

iPhone, iPad, iPod Hardware Repair Hardware Repair discussions for iPhone, iPod , iPad & Apple Products, help, guides.

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Old 09-10-2017, 18:29   #1 (permalink)
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iphone 5s no power on, need help


Hi,

when I connect power supply and press power button The power supply shows 0.00--->0.07A (is pulsing)

I checked
PP_VCC_MAIN
PP_CPU
PP_GPU
PP_1V8
is no short

what to check next ?
change u7 or u2? what first ?
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Old 09-11-2017, 10:00   #2 (permalink)
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U7.
also check i2c0 i2c1
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Old 09-11-2017, 18:51   #3 (permalink)
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i2c0 and i2c1 is not short.
I checked on R17, R18, R19, R21. did i do good?
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Old 09-12-2017, 10:09   #4 (permalink)
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Quote:
Originally Posted by farmeroski View Post
i2c0 and i2c1 is not short.
I checked on R17, R18, R19, R21. did i do good?
1.8V is there?
also check PP1V8_SDRAM
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Old 09-13-2017, 12:48   #5 (permalink)
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yes but is not stable. 0.3...0.7...1.7V over and over again, is looping
power consumption is looping too 0.00...0.03...0.07A. max 0.07 and start again from 0

PP_VCC_MAIN is stable
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Old 09-13-2017, 16:13   #6 (permalink)
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all of them not stable?
Do you have osciloscope?
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Old 09-13-2017, 17:19   #7 (permalink)
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Yes, all
All v lines behave the same
pp1v1
pp1v8
pp3v

I dont have osciloscope
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Old 09-14-2017, 09:36   #8 (permalink)
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Quote:
Originally Posted by farmeroski View Post
Yes, all
All v lines behave the same
pp1v1
pp1v8
pp3v

I dont have osciloscope
you need to change U7
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Old 10-01-2017, 17:27   #9 (permalink)
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Thanks for you help
I buy new one u7. I reply soon
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Old 10-06-2017, 18:36   #10 (permalink)
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u7 replaced by new one
It does not work, it is the same, nothing has changed
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