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O iPhone 5s da Apple foi anunciado em 10 de setembro de 2013. O reparo deste dispositivo é semelhante ao de modelos anteriores e requer chaves e ferramentas de abertura. Disponível como GSM ou CDMA / 16, 32 ou 64 GB / nas cores prata, dourado e cinza espacial.

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Finding a short on my iPhone 5s

I got an iphone 5s that the seller said randomly shut off annd would not power on about two weeks ago. The phone does not charge. The battery reads 2.5 volts.

I am getting ready to use my multimeter to test Bat VCC, VCC MAIN and 5V0 USB in ohms/diode mode for shorts. If I find a short why cant i just hook up the DCPS to the battery terminal and use freeze spray? What is the importance of “injecting“ current directly into a cap into the line? And if there is a short on PP5V0USB can i find the short by injecting into VCC MAIN since VCC MAIN supplies those rails too?

On the ammeter the phone only pulls 0.12 amps, what does this tell me about the possible issue with the phone?

(Itunes recognizes device as in recovery mode… i tried the methods for fixing this, im pretty sure its a hardware issue)

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1 Solução

If I find a short why can’t I just hook up the DCPS to the battery terminal and use freeze spray?

·         You can but what do you think will heat up the shorted IC or cap or the charging mosfet?

What is the importance of “injecting“current directly into a cap into the line?

·         For VCC main it bypasses the charging mosfet. For other lines it’s the only way to inject voltage into the line.

If there is a short on PP5V0USB can I find the short by injecting into VCC MAIN since VCC MAIN supplies those rails too?

·         No VCC main supplies the power management chip. The power management chip supplies all the other rails.

On the ammeter the phone only pulls 0.12 amps, what does this tell me about the possible issue with the phone?

·         It tells you the phone is not charging. Do not try and diagnose a phone with a usb ammeter.

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