Hey folks!

Just wanted to say hi as a new member of the Badcaps community. I'm based in London and I’ve always enjoyed tinkering with tech - fixing up desktops, laptops, testing parts, and seeing what can be revived instead of thrown away. Recently I’ve been spending more time working on old ThinkPad and ASUS laptops I’ve picked up from eBay as damaged or faulty.

I found this site while searching for info about BIOS reflashing, and I have to say — this place is a goldmine of knowledge. I’m hoping to learn more about diagnostics, BIOS flashing, and general component...

Hello everyone,

I’m currently troubleshooting an issue on my Lenovo ThinkPad T470p (Type 20J6) and would really appreciate any insights or solutions.

Issue summary:

Whenever I remove the main laptop battery and AC adaptor, then place them back, the system gives a “CMOS checksum error” at next boot, and the BIOS clock resets to its default time/date.

However, the RTC works fine as long as the main battery remains attached — even if the laptop is unplugged for hours. Same as I remove the battery while the AC is attached, RTC remains. Obviously,...