Scammed on eBay. Fake chip. IBM 5155 Portable and PCjr repair

In this retro computing repair video, I troubleshoot two classic IBM systems after an eBay scam involving a fake chip. Watch detailed diagnostics on an IBM 5155 Portable with a garbled screen and an IBM PCjr with two beeps and a black screen. The video covers vintage PC troubleshooting, component testing, retro overclocking experiments, and real-world repair setbacks. Perfect for vintage IBM PC enthusiasts, retro hardware collectors, classic computer repair fans, and anyone interested in early PC diagnostics and restoration challenges. - PCB Prototype the Easy Way. Full-feature custom PCB prototype service. https://www.pcbway.com/ - Support me on patreon.com/Epictronics Buy me a coffee: https://ko-fi.com/epictronics - IBM PCjr Playlist:    • IBM PCjr Playlist   IBM 5150 Playlist:    • IBM 5150 Personal Computer   IBM 5155 Playlist:    • IBM Personal Portable Computer 5155   IBM 5160 Playlist:    • IBM XT 5160   - Gerbers for Skinny Sprint here: https://github.com/epictronics/Skinny... - Tools I regularly use FNIRSI DWS-200 Solder station PinePower Bench PSU AMTECH NC-559-ASM Flux Kester 951 Flux pen Hanstar 861DW Rework Station Pro'sKit SS-331 Desoldering Station SEQURE HT140 Desoldering Tweezers Multicore 60/40. 0.38mm solder AOYUE int883 PCB Preheater RIGOL DHO800 70MHz four-channel digital Oscilloscope Tektronix 2246A 100 MHz four-channel analog Oscilloscope FNIRSI DPOX180H 180MHz Handheld Oscilloscope UNI-T UT61E Auto Ranging Multimeter UNI-T UT890D Manual Ranging Multimeter FNIRSI LC1020E LCR/ESR meter TL866 II Plus Programmer InfiRay P2 Pro Thermal Camera TOMLOV TM4K-AF Flex Microscope Dremel 3000 with flexible shaft MaAnt Mini"Dremel" DeoxIT D5 Contact Cleaner PCBs from PCBWay.com - Support me on patreon.com/Epictronics Buy me a coffee: https://ko-fi.com/epictronics Join me on Twitter:   / epictronics1   - Music by Karl Casey @ White Bat Audio