This iPhone 4S came in for Data Recovery due to Water Damage. It also had previous repair attempt.
Visual inspection found corrosion in multiple places, but nothing a little toothbrush & iso couldn't solve.
Then I checked it with my DCPS, which was not showing any shorts & appeared to be booting, but had no image.
I found there was a corroded pin on one of the screen FPCs, as well as a missing filter near the connector, which I fixed. (see pic 1)
Now I have image, but the device is bootlooping when testing with known good parts.
I checked the corroded areas again for any possible clues but no luck.
So I went ahead & flashed an update and it failed!
I got error 29 at 60% on 3u tools with iTunes Flash option (see pic 2 & 3)
I did some googling & saw some posts saying it's the battery. I tried another battery to be sure but same results.
I then tried easy flash on 3u tools and saw it made it past 60% but failed at 80%. But this time, I got a clue! It said it failed at "Updating GasGauge" which is a sensor that reads battery data. (see pic 4)
And if you know anything about iPhones & battery data, there's usually a filter at the battery connector that causes battery issues. And sure enough, there was one missing. (see pic 5 & 6).
I fixed it by running a jumper to reconnect the GasGauge data line (see pic 7) and I was able to flash the update successfully!
Which then allowed me to get the customer's data!
I started board repairs during the iPhone 6 to 7P days, so a lot of iPhone 4S stuff is so foreign to me.
But using the same principles that apply to almost every device, I was able to be successful in this case!
I hope you enjoy this read & learn something from it!
If you have a Seek Thermal Cam, you're missing out if you don't have a VCC Seek Stand: https://www.vccboardrepairs.com/buy-seek-stand
Injured Gadgets just got these back in stock, so get them while you can!
It can take us a while to build these out sometimes, so they're sometimes out of stock for a while, but we're working towards always having inventory ready to build more as they sell out.
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.
🌟 Cordless Screwdriver with T9 Bit: https://amzn.to/3E5duCj
🌟Extended T9 Bit: https://amzn.to/3c4YJac
It's rechargeable through micro USB and allows you to easily swap the tips out. You can also fold it to be straight or L shape.
Let me know below if you are already using an electric screwdriver 👇👇
Stop Guessing at iPhone Panic Logs
Panic logs can provide valuable information about why an iPhone is restarting, but identifying the actual cause is not always straightforward.
A panic log may point toward a charging-port assembly, proximity sensor, power circuit, missing sensor, damaged flex cable, or a board-level issue. The difficult part is knowing which component is responsible on each particular iPhone model.
That is why I created the VCC Panic Log Cheat Sheet.
Personally Tested and Verified Solutions
This is not a generic list copied from forums or collected from unverified posts.
The cheat sheet is based on panic logs and solutions I have personally tested and verified while repairing iPhones at VCC Board Repairs. It covers virtually every iPhone model and documents the parts, sensors, flex cables, and circuits commonly associated with specific panic strings and numerical values.
The goal is simple: help repair technicians diagnose restart issues faster and avoid wasting time or money replacing the wrong parts.
...
In case you haven't heard, I will be moving from Las Vegas, NV to Star, ID.
In my Las Vegas office, I had fully custom built workbenches for myself & my employee(s). But now it's time to go & tear everything down.
I'm really sad since these benches felt like the perfect layout! Or maybe I just got used to them.
I've attached some pics of what it looked like before & now that's all gone.
I do have some good news tho.... I recorded a detailed video of my office for youtube! I'll be posting that video soon!
Like this post if you want to see that video!
