Classic ZX Spectrum Repair – More Broken Than Expected скачать в хорошем качестве

Classic ZX Spectrum Repair – More Broken Than Expected

https://www.pcbway.com/activity/anniv... ZX Spectrum Repair – No Sound, Faulty DRAM, and a Bad Capacitor In this episode of More Fun Fixing It, I take on a ZX Spectrum 48K (Issue 3) with several issues: no sound, corrupted video output, and suspected RAM faults. What’s covered in this video: Investigating and fixing the missing audio Tracing colour issues back to a fault in the video circuitry (TR8) Identifying and replacing a failed ceramic capacitor Swapping out a faulty upper RAM chip at IC17 Running diagnostics to confirm the repair This Spectrum needed a bit of everything—logic probing, component swapping, and some trial and error. But by the end, it’s back up and running with clean video and working sound. This repair is part of the ongoing restoration series on the channel, focusing on bringing vintage systems back to life. If you’ve worked on a similar repair or have a Spectrum with issues, feel free to share your experience in the comments. *NEW* Patreon patreon.com/morefunmakingit MAIN CHANNEL!    / @morefunmakingit   BlueSky https://bsky.app/profile/morefunmakin... Ko-fi page https://ko-fi.com/morefunmakingit Amazon Wishlist https://www.amazon.co.uk/hz/wishlist/... Discord Channel   / discord   More Fun Website https://www.morefunmakingit.co.uk/ Facebook   / morefunmakingit   0:00 Introduction & Issue recap (exploded D9, TR4/TR5, 5V rail fault) 0:32 Checking diode D9 & suspect transistor TR7 1:05 Unusual decoupling capacitor observation (Issue 3 board) 2:00 Sponsor segment: PCBWay's 11th Birthday 2:54 Verifying faults again (5V rail resistance, TR4/TR5 transistor checks) 4:41 ESR capacitor check—finding suspect caps 7:30 Removing suspect capacitors & deciding to recap entire board 10:10 Installing new capacitors & dealing with lifted pads 14:21 Lost pad repair explanation (pads without thermal mass) 18:20 Desoldering damaged TR4/TR5 transistors & checking replacements 17:17 TR4/TR5 transistor replacements soldered in 21:51 Removing damaged transistor TR7 & quick check 24:00 Initial power rail tests after replacing TR4/TR5 24:40 First power-up test: no sound & RAM fault at IC17 25:20 Removing faulty IC17 RAM chip destructively to protect pads 29:35 Cleaning PCB after IC17 removal & installing new RAM chip 36:50 Successful power-up test after RAM replacement 37:07 Audio circuit fix (installing diode D9 and transistor TR7 replacements) 44:00 Discovering faulty speaker; replacing the ZX Spectrum speaker 47:30 Composite video mod & final tests 47:57 Repair summary & notes (caps, IC17, D9, TR7, speaker replaced) 49:44 Patreon mention & closing remarks