FINAL UPD: Turned out to be faulty BIOS chip. Needed a chip swap
Hello everyone, hope you can get my workhorse Dell back up and running. Out of warranty September 2019. I'm having the following issue: A similar looking issue was already discussed here on this forum, yet mine is different, since the laptop turns on and operates normally on battery (and 3-5 code, according to Dell, is SBIOS Flash Corruption, not Power Rail Failure — that's 3-4). The details Steps taken Please, help me to fix this issue or at least to understand what that is.
XPS 15 9570, 3 amber, 5 white lights blinking when plugged in