Chris Stables

Making up some leads for the DCPS and would like to know does the MacBook determine what wattage magsafe it is using from...

I don’t know a lot about MacBook circuitry and I don’t advertise their repairs but there is one customer who does send...

Any idea where I could purchase a QFN8 to DIP8 Adapter that will fit a bios chip off the 820 00875 board. The only one I...

I got sent a mac which had the U5860 temp sensor torn off along with all the pads on the board. It would take ages to boot...

Would someone be able to tell me the orientation position of U5860 on the 820-00239 logic board. I can only make out a...

Your Mac is powering on correctly when it does start. This model starts and stops the fan twice before booting.  You would seem to have a problem with a corroded trace or oxidised solder balls or pads under one of the BGA chips that is why it is shutting down and only starting sometimes. This is a frustrating problem but put under a microscope could well show signs of where the problem is. Of course I would rule out a parts issue first like battery, DC board, I/O cable and track and touchpad.

The notification is telling you. “I am not letting any power into my charging circuit because it has a faulty component in it” This is protecting your Mac. The liquid has obviously damaged a charging circuit component. You will need to source a reputable repairer to replace the faulty component. It is no good going to Apple as they will tell you need to purchase another Mac.

The baseband is behind it. If it has trouble reading I doubt the chip would be the cause.

It is a capacitor on the battery line. There is polarity on the board but not the capacitor so it doesn’t matter which way it is placed. I think your Mac should still work without it but I would have it resoldered as it is one of the only two capacitors on that line.  You would need to take or send it to someone who offers board repair so they can resolder it. You could even try a TV repair shop since you have the component.

That is the correct diode reading for where you have your probes. This is the charging port connector. You are measuring the voltage drop between ground and a power rail. Believe me if the reading was .001 you would defiantly have a problem.

You would need to rule out your screen. The main reason for a non-functional home button on the 7 and 8 series is a faulty home button flex cable, the one that goes from the screen to the logic board.

This is a common problem for the 6s plus. The Wi-Fi chip develops a short. I would make sure you have backed your data up. The replacement of the iPhone 6s Wi-Fi chip would cost more than another good second hand one.

I had this problem once on a water damaged iPhone 6 after running the jumpers and re-balling the baseband CPU it still had no firmware. I replaced every chip under the bottom shield and it didn’t help. So I would defiantly say this is the baseband CPU or the traces under it. I wouldn’t spend any more time on this.

This is a signature fault on the iPhone 6 plus. It is known as touch disease and requires the touch IC to be removed and a small jumper wire soldered. This is why you have to warp your phone as the trace and pad under the IC has lifted.

If your phone is not charging and it is a new battery it could be your charging dock but it is most likely an IC on the logic board known as (tristar) it is one of two charging IC’s and is often the cause of the problem you are having.