ZX Spectrum 128K "Toastrack" Mega Repair (Part 1)

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This board of a Sinclair ZX Spectrum 128K "Toastrack" stopped working when an expansion was plugged in on the edge connector while it was powered on. Initially I thought this was going to be a quick repair with a blown transistor (I even say it's a "Nibble edition" in the intro 🤣🤣), but as I kept going deeper and deeper, more things were coming up as faulty. How many things were blown up? Will it come back to life or is it gone?

Chapters:
00:00 Intro
01:34 Initial power up
02:58 Video out test
03:16 Measuring voltages
04:02 Testing transistors
09:54 Replacing TR4
12:25 Testing the Z80
16:36 Examining the busses
19:49 Testing the ULA
22:32 Testing the ZX8401
23:43 Testing the RAM
26:09 Final body count

Links:
ZX Dandanator Mini
ZX Diagnostics


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#zxspectrum #repair #sinclair