⚙️ZX Spectrum repair - Can an amateur with a cheap oscilloscope fix it? (RG 

What to do when the ZX Spectrum 48K suddenly stops generating images? Is it enough to simply replace the ZTX313 transistors with replacements? Or will it need to be examined more closely with an oscilloscope? Free PCB prototype and fast turnaround time: www.pcbway.com
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TABLE OF CONTENTS:
00:00 Welcome
00:53 My ZX Spectrum broke down - again...
01:52 We're taking the ZX Spectrum to the workshop
02:14 9V and 5V on the voltage regulator
03:42 Voltage waveforms on transistor TR4
05:27 +5V, -5V, +12V on RAM chips
05:52 How about moving the capacitors?
06:07 Waveforms of video components at ULA
07:03 Does the LM1889 modulator work?
07:45 What about our Video PAL signal?
08:48 Sendo of the problem - TR1/TR2 transistors
09:33 Let's check out the old ZTX313 transistors
10:25 BC548 replacements and their careful assembly
11:52 We are checking the PAL signal
12:10 We check the computer in action
14:12 Summary, conclusions and plans
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