Socket 7 motherboard repair - endless faults!

Trying to revive a pretty uncommon Socket 7 motherboard: it's an ASK ATX55C for which I seriously struggled to find any info at all! RetroWeb entry (which I helped updating) is here: https://theretroweb.com/motherboards/... As mentioned in the video, please take a look at Necroware's channel here: ‪@necro_ware‬ 00:00 Introduction 01:12 Overview 03:25 Jumper configuration 07:08 First power up 07:35 Troubleshooting 09:58 Fault 1 13:00 Fault 2 15:53 Fault 3 20:10 Fault 4 20:38 Alternative memory/Fault 5 26:21 External 3.3V test 27:00 Fault 6 30:10 Cache removal 31:43 Keyboard controller replacement 31:50 It lives! 34:00 3.3V troubleshooting 37:53 Conclusion For the records, the allegedly faulty cache chips are labelled "PB CACHE SS80L6432Q-75 B85111AAB9725" The tag chip is "UM61256FS-15" The grinding tool I’m using was recommended by ‪@necro_ware‬ but the exact one I got is not available anymore. This one looks identical but cannot guarantee it’s going to be the same. https://www.aliexpress.com/item/10050...