Hi FriedFred, I have looked at this but I have no comparison and it seems that this is a schematic that is hard to come by. I have ordered a new isl and will test with a new component.

Hi , I had an issues with a 5420 Latitude, it would not boot and I tracked it down to the pmic which I changed and now the device boots. Now the battery is not detected, I get 1 white and 4 amber flashes when battery connected. I tried two batteries, one was new, and the issue persists. Can anyone point me in the right direction please ?

Hi everyone, I have a 2015 A1398 with no backlight. The backlight circuit tests ok because I am getting around 53v on J8300 pin 1. I wanted to check the voltage on the screen side of the LVD cable, so I reconnected everything and the backlight works again. I am wondering if I got lucky or this is an intermittent issue.

Thank you

mon2[USER="295753"]mon2[/USER] Thank you for your help and the explanation.

The job was a topcase replacement. I sourced a used by good condition topcase but as I was re assembling I noticed the track pad cable was damaged, see attached. I put the Mac back together minus the trackpad and it would not boot. I did not realise that the trackpad needed to be connected until [USER="295753"]mon2[/USER] told me. As soon as I replaced the trackpad cable it booted.mon2...

OK thank you, I have replaced the trackpad cable and reassembled and it now boots, thank you all for your support. Great forum, great techs ...

Hi, thank you however the issue happens even if the touchbar is not connected....

Hi Everyone. I have a Mac for a topcase replacement. I have completed the job however the Mac will boot and I get the startup chimes but not pass the Apple Logo, not even a progress bar. After a few seconds the fan spins fast. The board is 820-01598-A. I have disconnected everything except the USB ports and display and the issue persists. I am drawing 20.42v and .461A with just the screen connected so it looks like it is booting. I have looked over the board with a scope and I do not see anything that appears wrong. I can not get into diagnostics, NVRAM reset or DFU. The only issue is the topcase...

Hi Guys, I have a 2017 MacBook A1534 with no sound. The device is not even listed under sound and output. I have reinstalled macOS and have now removed the logicboard, it looks very clean. Nothing stands out. I have checked the schematic and was going to look around U6310 and U6320 however has anyone else seen this and would you mind offering some direction? Thanks guys.

Bob

Hi everyone, I have this device out of warranty. The WiFi will not turn on. I get an error in device manager saying the device could not start - error code 10. I started off with driver updates, firmware updates. I reinstalled Windows. I replaced the WiFi adapter and the same persists. I have inspected the system board under a microscope but nothing stands out, it appears intact with no corrosion. Has anyone got any tips, I am pretty sure I have ruled out a software or firmware issue and everything else is working ok.

Any ideas would be very welcome.

Thanks guy...

Re: New Members - please post your introductions here

Hello everybody. Im in the UK, been a Microsoft and Apple consultant for near 20 years and just getting into board repairs as I want to start my own business now.

Bob

Re: The longest you've ever used a single system?

HI, I had a 2010 MacBook Pro 13" for 10 years and only replaced it because it would not go further than High Sierra. Opinions vary but for me this sealed the Mac deal and I will never be a PC user again based on this experience.