Are bad caps a thing? ZX Spectrum 48k rubber key repair!

Another quick(ish) vintage computer repair.
This poorly Sinclair ZX Spectrum has a corrupted display. Bad RAM? CPU?
Capacitors?!?! Maybe!


Initial checks video
   • ZX Spectrum (48K & 16K) Initial Tests  

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00:00 Introduction
00:39 We're going in!
01:47 Mostek CPU
02:20 Checking resistance
02:35 Removing the Voltage Regulator and Transistors TR4 and TR5
03:33 Powering on
03:53 Composite mod
04:53 Powering on (Again)
05:31 Checking Voltages (and a slip)
06:38 Replacing the Capacitors
06:50 A Clumsy Mistake
08:54 Testing
09:13 More Recapping
09:37 Testing and Success!
10:00 Finish the Recap
12:12 Replace TR1 and TR2 Transistors
12:56 Screen Test
13:15 Put it Back Together
13:37 Testing with CRT and loading Jetpac
14:08 Check Scraped Trace
15:19 Goodbye!


#zxspectrum #computerrepair #sinclairzxspectrum