Chris Stables

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...

This sounds like a NAND or CPU problem. When it exits out of DFU mode it is not getting instructions on what to do next that’s why it never reconnects to iTunes. The only thing I would try is replacing the battery as DFU mode doesn’t use much power so when it switches from that to normal mode if the battery was faulty and couldn’t supply enough amps it would shut down.

Yes your home button and touch ID will work. The flex that is on the screen back plate is not married to the board.

There is no real way of knowing the parts you will need until you open it up and examine it under a microscope. If you cannot see which part has failed you will need to take some readings with a multimeter. The backlight circuit has a number of components that can fail. Some of the components have underfill glue covering them so they are not easy to see if they are damaged. The components that are on the backlight circuit that can get damaged from a screen replacement without disconnecting the battery or some other electrical fault are. ·         LCD connector ·         Shorted capacitors ·         A failed filter ·         The backlight driver ·         The backlight diode ·         The backlight coil To replace any of these you need hot air station, soldering iron and a microscope not to mention experience. The backlight components are in red. When you find what component has failed you can order the part from lots of places.

Greyed out Wi-Fi is defiantly a problem with the Wi-Fi chip or the big audio IC. On a working phone you can remove all the Wi-Fi antennas and it still will not be greyed out so you can rule out antenna problem. If you don’t want to get it repaired you could try and put a thin piece of packing under the Wi-Fi chip so it has a little more pressure on it. Sometimes this can get a couple of month’s usage before it completely fails.

Put the phone in DFU or recovery mode and do a restore. I gather you have tools if you are repairing phones. ·         You will need to short pin 11 on the touch FPC to ground instead of pressing the home button.

If your iPhone cannot determine what charge is in your battery it will reboot every few minutes. ·         Check the battery connector is seated properly. ·         Replace the battery. ·         Disconnect the front camera flex and see if it re-boots. ·         Enable assistive touch than connect the new screen without home button of front camera assembly. If none of these things helps, you most likely have a problem with a charging IC on the logic board.

This is defiantly a screen problem. If the screen is not damaged take it back and show them the problem. If they are a reputable shop they will gladly replace the screen for you.

You cannot separate the front assembly. If they will not let you black the front camera out you will have to cut the flex before the camera. The sensor and earpiece speaker should still work.

On the Qualcomm boards this problem starts at the BBPMU from flexation we presume as it is closer to the flex line than the Intel boards which don’t suffer from this problem. On the Qualcomm boards when the BBPMU IC fails it usually sends a higher voltage to the BBCPU which cannot handle it and develops a short. I wouldn’t spend too much more time on this phone unless it has had the audio IC repaired which I would than remove and re-ball the BBCPU. Don’t rely on the ZXW readings always compare to a known good board.

3uTools has an option to set the phone up. It is a free program and works on windows.