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Comprehensive repair manuals on all portable tablet computers by Apple. Repairs are likely to require heat and careful prying.

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Multiple iDevice IPAD drain

Technician of 5 years here. This really does have me stumped so any further advice would be appreciated. I have 3x iPADS = 2X iPAD 5, AIR 2 here. All are draining more than 30% overnight on standby. Latest iOS installed at the time of writing this (12.1). Freshly flashed so no apps installed or running in the background when these multiple "overnight drain tests" where completed. Charged to 100% before each test.

Lets start with the AIR 2 (3G) Manufacture date = 2014

Battery percentage capacity reading = 99% cycle count = 184

Tristar/Hydra = pass. PP5V0_USB (Tigris) is not shorted to ground.

Dock test = pass. Diode mode measurement to check the Dock Flex assembly for proper connection to the MLB. Rail 1-3 and 5-7 are connected to Tristar/Hydra. Changed to a new battery. Tested drain overnight again. Issue is still present. All the same test were completed on the following pads. All yielded similar results.

iPAD 5 Manufacture date = 2017

Battery percentage capacity reading = 98%

cycle count = 114

Tristar/Hydra = pass. PP5V0_USB (Tigris) is not shorted to ground.

Dock test = pass. Diode mode measurement to check the Dock Flex assembly for proper connection to the MLB. Rail 1-3 and 5-7 are connected to Tristar/Hydra. Changed to a new battery. Tested drain overnight again. Issue is still present.

iPAD 5 Manufacture date = 2017

Battery percentage capacity reading = 100%

cycle count = 9

Tristar/Hydra = pass. PP5V0_USB (Tigris) is not shorted to ground.

Dock test = pass. Diode mode measurement to check the Dock Flex assembly for proper connection to the MLB. Rail 1-3 and 5-7 are connected to Tristar/Hydra. Changed to a new battery. Tested drain overnight again. Issue is still present.

Has left me scratching my head.

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I should also note since posting this I have gone and tested the batteries on my cadex (for short testing lithium battery cells and degradation) All passed. So at this point I am ruling out the batteries themselves.

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What are you using for the Tristar test; are you using the blue Tristar Tester?

How are you testing the dock flex; are you using the green board plugin on one end and the test points on the back of the logic board?

Normally fast battery drain is caused by a bad Tristar. It’s also a relatively easy chip to replace. If the dock flex looks good and the battery is good, then that would be the next step.

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Yes I am using the blue Tristar Tester, I am a second hand dealer / repair and this issue seems to becoming more and more frequent. I now have a few more to add to the stock pile. Could the Tristar issue be that common across so many devices? Thanks for the input.

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I am going to take a sample of 5 battery drains with good batteries and change the tristar on each one and re-test to see if it yields and different results. Even tho that pass the tests.

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Please come back and share the results!

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Anon will be eternally grateful.
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