This iPad 7 came in for Bootlooping/Error 9 after battery replacement.
Error 9 is really common after battery replacement. The theory is that a fully dead battery will kill the NAND when it's stuck bootlooping for a long time.
Although I can't say for sure that's why. But almost every Error 9 I see, has a history of a battery replacement right before it happened.
Error 9 requires a NAND replacement. In this case, the NAND was fully dead. I could not read it on my P14 Pro. (My JC P7 wasn't working at all either).
But I was able to at least get the original Serial Number when it was stuck in Recovery Mode.
I replaced the NAND with a 32GB NAND from an iPhone 7. I wrote a generic SYSCFG from an iPad 6 (2018) due to the P14 Pro software not having iPad 7 for some reasons. And I made sure to edit the junk SN it created & write the original SN, even though I didn't have the original WiFi/BT Address.
I then soldered the NAND onto the board, restored it & it was successfully booting, but No Touch & would not activate (due to wrong WiFi/BT Address).
I then used Purple Mode to "Query original factory code" which gave me the correct SN, WiFi, BT for this device within seconds. Maybe like 30 sec or so.
I also noticed in Purple Mode, the P14 Pro software had iPad 7 generic SYSCFG option. So I also clicked "Write standard bottom layer", then edit in the correct SN, Wifi/BT Address, also edited the Model from "CH/A" to "LL/A" for USA region. Wrote all that in and then restored the iPad one more time.
Then the iPad had touch & was able to activate. Unfortunately, I am currently waiting to hear from the customer for their iCloud info. But it should be fully functional now.
This was the first time ever I've seen a bad SYSCFG cause no touch. I was certain it was actually a CPU issue, as I had tested another known good digitizer & these iPad 7 are notorious for touch problems due to CPU.
I hope you found this helpful!
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This stand makes using a thermal cam so easy. So much better than any other thermal solution on the market.
It allows you to get real close up (using my Macro Lens), and easily find where the short is coming from.
Plus it's hard free, so you can have your hands free to try to boot the device from DCPS, while having an image that is in focus & not moving around.
You can even record a video through the app, while you inject voltage into the short, so you can go back & see exactly which component was it that was heating up.
Save yourself lots of time by getting a Seek Cam, Stand & Macro Lens! ...
Anyone who is doing game console repairs, knows how many screws you need to remove to access the motherboard.
Especially the PS5, with the 5,000 screws or so.
If you don't already have an electric screwdriver, GET ONE ASAP.
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I got an iPhone 15 Pro mailed in from New Hampshire for Data Recovery. The front & back were smashed pretty bad.
Took the phone apart & found the bottom board was dented pretty bad
Separated the sandwich to just the top board only and found I had a short before prompt to boot. Tracked it down to a shorted C4222 on PP_VDD_SNS_BPIC
Removed the bad cap & I still had a short. Found the next short on C3499 on VDD MAIN
After that, no shorts before prompt to boot. So I thought that was it...
Well I was wrong. There was a 700mA short after prompt to boot.
Looking at the board under the thermal camera.. heat was coming from the NAND. Although the NAND looked in very good condition with no signs of physical damage. See first pic.
So I decided to remove the NAND to check further.
Without NAND, no short. It would just boot to DFU mode
Closer inspection of the NAND, I found there was a small crack running along the side wall.
When the NAND is cracked, it's GAME OVER. There's no way to ...
I got this Samsung S22 Ultra for Data Recovery. The display connector had some water damage that caused a short on the FPC
After removing the FPC, I found the short was within the layers.
I tried digging it out & it worked, but after placing the FPC back, the short came back.
These are really annoying lol
So I've offered to do a CPU Swap & waiting for the customer to reply 🙏
