Difference between revisions of "Basic iPhone LB Troubleshooting"

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m (Category iPhone)
(Inserted some troubleshooting and organized the old text.)
 
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vcc main short? connect to power supply, does it go nuts and draw max current
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# '''Visual Inspection'''
 
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#* Check for any missing sticker or shield then follow next steps
3v0 nand short, does the amperage jack up when you hit power, also can just poke a few caps around NAND
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# '''Connect DCPS''' 
 
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#* Draw max current? If draw max current you have VCC MAIN line shorted.
next test tristar, whats the voltage at the battery fpc with no battery but charger connected
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#* Draw some current? So you have probably a cap leaking some current. Check for any liquid damage
classic failure will be a steady reading below 3v
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#* No current draw? Follow next steps
like .6v flat, bad tristar
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# '''Press Power Button for 1 second'''
it should jump around to match main voltage while it looks for the battery
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#* Check for current next you pressed the power button. It should be something around 60-90mah
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#* High current? Check for any ugly cap around NAND or VDD_BOOST caps
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# '''Tristar test'''
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#* Check voltage on battery fpc without battery connect just with charger connected. This should jump around the charger voltage while it is looking for battery. If it goes below 3v like 0.6v flat you have a bad tristar.
  
 
[[Category:iPhone]]
 
[[Category:iPhone]]

Latest revision as of 06:45, 23 November 2021

  1. Visual Inspection
    • Check for any missing sticker or shield then follow next steps
  2. Connect DCPS
    • Draw max current? If draw max current you have VCC MAIN line shorted.
    • Draw some current? So you have probably a cap leaking some current. Check for any liquid damage
    • No current draw? Follow next steps
  3. Press Power Button for 1 second
    • Check for current next you pressed the power button. It should be something around 60-90mah
    • High current? Check for any ugly cap around NAND or VDD_BOOST caps
  4. Tristar test
    • Check voltage on battery fpc without battery connect just with charger connected. This should jump around the charger voltage while it is looking for battery. If it goes below 3v like 0.6v flat you have a bad tristar.