Carl0s-
Member
Last Activity: 06-26-2024, 02:28 PM
Joined: 04-15-2024
Location: Espoo
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I get no voltage on Q8504-5 nor I get any voltage in Q8504-"123". If (big if) I intreper the schemas correct in 123 there is the PPVCC_MAIN ( tho can't figure out where this one is being fed ) which the Q8504 somehow regulates to charge the battery via Q8504-5 (PPBAT_VCC). Currently the logic board is out of the chassy (so no battery connected) and run by external USB power. Should I repeat the previous voltage test with the battery connected? -
Hi,
L8512-1to GND ~1Kohm
L8512-2 to GND ~1KohmLeave a comment:
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Here's the measurements:
L8512-1: 0,142v
L8512-2: 0,141v
Q8504-5: 0,667v...Leave a comment:
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Yeap...Leave a comment:
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Hi, atm i don't have schematics - found some iPad 5 schematics from this forum but non of the test points / components line up. After I find proper schemas I will do above measurements and post results 👍...Leave a comment:
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Did some measures using multimeter:
when the logic board is connected to a power bank and I measure from where the flex cable connects to the logic board I get 4.8v (which goes away when I pull the plug). While the logic board is connected to the power bank, if I measure the logic boards battery terminal I get 0,4v so I guess its the actual "power electronics" that have gone bad
I was thinking: I have spare micro usb powerboard that could fit in place of the original lighting port after some modifications. Threat or possibility if I pull jumper wires from...Leave a comment:
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3uTools seems to be able to pull battery data just fine... What caught my eye is that its only been trough 32 charge cycles :/ ... Soo, the Tristar IC is the next suspect?
[ATTACH=JSON]{"data-align":"none","data-size":"custom","height":"1179","title":"3u_tools.png","width":"2407","data-attachmentid":3253787}[/ATTACH]...Leave a comment:
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Hi! I'm Carl from Finland. Found this forum when I was googling how to resurrect and old iPad so I could pass it to my kid.
As a background - way back in the early 2000's (2004 - 2007)I went to vocational school on how to fix electronics. On the last year spend 6 months in an internship at the official Finnish Samsung repair center. Buuuut then life happened and I some how ended up working in IT.
Mainly here to ask help - and hopefully learn something new in the process
...
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Hi,
Its auto ranging - momentary I were able to get reading of 17 Mohms but it went away. Almost like connector would be bad and having intermittent connection - but after measuring reconnecting the battery made it power right up....Leave a comment:
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Measured from the logic boards + terminal to the chassy of the iPad I get no connection at all. Measuring from the negative battery terminal of the logic board to chassy I get 0,1ohms...Leave a comment:
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iPad 5th gen (A1823) - No charge but recognized by finder
Hi,
Sooo - our IT got a pile of old iPads that the sales guys have been mistreating. These are free for grabs if you want to try to get one working. Thought I'd give it a try - if I get at least some life to I can give to my kid to entertain during a car rides.
But the iPad it self - its a 5th gen cellular model. When I initially plug it in it was completely dead. It was not recognized by my Mac nor it started to charge. Disassembled it opened up the battery connector and checked the battery voltage. My multimeter showed 0,7v. Had a spare micro-usb charging board lying...Last edited by Carl0s-; 04-15-2024, 12:59 PM.
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