08-20-2018 09:02 PM
I talked to local lenovo thinkpad warranty service technician and they said the reset button accessible trhough base using a paperclip does the equivalent of disconnecting the internal battery from the system for the duration of time the button is pressed. It does not carry out a cmos rtc battery disconnect.
I then booted the system with cmos rtc battery, m.2 ssd drive, wlan card and internal battery all disconnected. With this configuration the issues i'm experiencing were still occuring although now in a slightly different way. So the conclusion is none of those disconnected parts were/are contributing to my issues and point even more to it being something wrong with systemboard.
10-12-2018 04:32 AM
Maybe something went wrong during the flashing process. I've experienced similar issues with a Gigabyte board after a failed bios update. You could try to use the recovery method described in this thread or to flash an older bios by using an eeprom programmer (i.e. CH341A devices), which you can buy for cheap on ebay.
I hope you're successful!
10-12-2018 07:30 AM - edited 10-12-2018 07:35 AM
I had used the computer for just over a month since i flashed to v1.35 of bios so nothing went wrong with the flashing process this was an event that arose long after that last bios update flashing.
I have sold the computer on ebay for parts because the cost of a new systemboard outweighs what it is worth once it is up and running again. If i could have gotten a replacement systemboard for $100 it would have been worth trying but they were all $250 and up in price.
10-19-2018 09:34 AM
I have the same issue with my Lenovo Carbon X1 Type 20A8-003XHV with Intel I7 and 8 GB of RAM,
After lenovo update , the Display is dead, the external monitor is dead, however my Function key ribbon is also working and even turn light on of on keyboard.
In my case windows is able to boot sometimes, but dies after few minutes, or the display is full of stripes .
if I leave the pc off for some time more than 5 minutes then is able to show the splash screen, and I can go into bios settings with F1.
But No solution to boot