CRG | Can I fix an eBay spares repairs ZX81 with an AliExpress Oscilloscope? @CRG | Uploaded July 2023 | Updated October 2024, 1 hour ago.
I finally got myself a new Oscilloscope but not wanting to spend to much money I found one on AliExpress for only £40. I also recently bought a ZX81 from eBay that was sold for spares or repairs so can I use one to fix the other?

Thanks to Lee from @MoreFunMakingIt for sending me the composite mod for the ZX81 along with same for the Atari 2600 and a Kung Fu cart for the C64! Make sure to go check out his channel and don't forget to say CRG sent you :) youtube.com/@UC5WFTrin8VTv397vQIA8mcA

AliExpress oscilloscope - aliexpress.com/item/1005005368374529.html

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Music - Cathode Ray Gun by @Momentvm

Chapters
00:00 Intro
01:02 First look and unboxing
04:57 PSU test
06:26 Opening the ZX81
07:13 Look around the ZX81 board
08:35 Powering up
09:55 Testing with the scope
13:06 Composite mod and thanks to @MoreFunMakingIt
19:22 What's on the screen
19:44 More scope tests
22:39 Down the ram rabbit hole
26:41 Swapping the CPU
28:52 Keyboard test and repair
32:12 Will it load something?
34:05 Ear input repair
35:28 Will it load something now?
40:01 Conclusion and credits