Hello to everyone. My first post on this forum
I have been able to replace IC cluster on my Model S85 2013, thanks to this forum. I would like to add some points here because I believe someone could benefit from it.
My symptoms:
IC cluster was Gen1 and it didn't have any bubbles but suddenly it went completely dark and never turned back on. Car was normally driveable so I lived with it for a month or so. I removed the IC from the car and hooked it up to power and connected the wakeup pin to +12V. Only thing it did was that the fan started spinning, but no leds were shining nor any other signs of live. First observation which could help someone is that car works even if the IC is completelly disconnected, so being able to *sugar* gear to D isn't actually sign that only display of IC went off. Seem my IC board just gave up.
My solution:
I had another IC from Model S75D 2017 - facelift. It was Gen2 cluster with higher resolution display and without the fan. I was worried because I have read all this forum and didn't get conclusive answer whenever the replaced IC will communicate with car and I was worried that it won't be driveable and I will have to call to SC. I live in Czech Republic and SC here aren't very reliable. But I decided to give it a try. I hooked the new IC cluster (I only powered the car off from main MCU. After hitting the brake the IC went on immediatelly. Car automatically switched into Service Mode. IC cluster immediately switched the car logo and description to S85 (from S75D). However it said that car needs service and it can't drive. So in Service Mode I went into the "Reinstall Software" and then I pushed the IC. Car started to download the update and after few hours it went through the installation. Unfortunately the status was still the same so my panic gauge started to go off the chart:-D So I went into Service Mode again and this time I pushed Full Reinstall. It again appointed that new software update is available, so I got it installed right away (it didn't download as it propably still had the installation files from last time). After two hours or so the car was good and IC is working flawlessly since then
Hope this will help to someone
Cheers.