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

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1st gen ipad have charging symbol but percentage not rising

Hi , i have a 1st gen ipad which does not seem to be charging , i got some charge back into the battery ( about 30 %) using a bench psu , so i'm assuming battery is ok

I have been checking voltages around the board , ( ive included the schematic , page 17 , i couldnt save 1 page for some reason )

i have 4.2 volts at L1900 & L1950 .

Which line should be charger voltage back to the battery ?

IPAD1 MLB.pdf

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what do you use the iPad for ?

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if you are use the device and charging it at the same time you are damaging the battery. so if you re doing that you may need a new battery, but depending on what you use it for I would just get a new iPad. Because it is out dated , newer ones have better cameras, etc.

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i bought it not working with a view to repair it , i have fixed not charging on a couple of i phones recently , but there doesnt seem to be a u2 chip on this , lol .

trying to learn the charge circuit .

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@needwifi2021 that is completely false. It just charges the battery slower.

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I got hold of another battery and that seems to have fixed it ! ..

The old battery took charge from my bench ps though and is still showing a steady 3.8 v now ..

I guess just because a battery can take and hold charge it doesnt mean its ok .

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Hopefully you are using it with a Mac. If so. download and run Coconut battery. There is an icon on it with and iOS device. Click on it to find out the status of your battery. Someone may have a better idea if you are using a PC. http://www.coconut-flavour.com/coconutba...

UPDATE 4/20/17

Yes the coconut Battery seems to be working and your iPhone looks good. However it looks like it does not see the iPad battery.

iPad Wi-Fi Battery Replacement

iPad Battery

iPad Battery Image

Product

iPad Battery

$34.95

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I have i backup bot and it is not seeing the battery .

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Coconut battery is not seeing battery either .

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I have never seen this happen. Try looking at another iOS device, such as an iPhone and make sure you are running the program correctly.

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I suspect that the older iPad doesn't communicate charge state. It's the same thing for iPod Touch's.

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Most Helpful Answer

The iPad uses a totally different charge circuit from more recent iDevices. It seems to differentiate between portrait mode and landscape mode. I have never worked on an original iPad so I can only give you some guidelines.

So in essence:

• PORT_DK_IDGATE / LAND_DK_IDGATE will go low (0V) to "close the switch".

• PPVCC_MAIN_FUSE & BATT_POS are connected together via Q1901 & Q1951 and battery charging occurs.

• When the battery is fully charged, PORT_DK_IDGATE / LAND_DK_IDGATE goes high and cuts the connection between PPVCC_MAIN_FUSE & BATT_POS. However, due to the Body Diode in the MOSFET, BATT_POS can still supply current to PPVCC_MAIN_FUSE and hence the rest of the device.

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Hi , yes i was expecting a 1610A2 chip to be there somewhere !! ,, on the Q1901 chip i have these voltages ,

https://www.dropbox.com/s/3nakb3x56vmq8c...

Q1951 chip looks the same and the voltages are also the same as this.

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So the Drain of the MOSFET is at 3.8V (which is the battery voltage). The Source is at 4.2V (VCC_MAIN) and the Gate is also at 4.2V. So that means that the circuit is not enabling the charging of the battery. This could be caused by many things but I would check the BATT_NTC_CONN line (if the battery is hot, it will shut down the charge) and the BATTERY_SWI line which feeds back the charge state of the battery. If this line is bad (see FL1900), it will not activate the charge.

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Hi , i finally got chance to look at this again , i have 0 volts on BATT_NTC_CONN (with charger on ) i have 2.5 vdc on FL1900 with the charger disconnected , i cant get at FL1900 with the charging dock connected , it is under the connector .

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Have you checked the continuity of FL1900? Do this when the device is powered off.

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Yes there is continuity through FL1900 , thats a 0 ohm resistor ?

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