Sinclair ZX SPECTRUM+ - Pin Screen

Sinclair ZX Spectrum Service Manual
Spectrum For Everyone https://spectrumforeveryone.com/
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6.6 COLOUR FAULTS (ISSUE 1 - ISSUE 3 BOARDS)
6.6.1 Pin screen
Change crystal X2
6.6.2 Blue haze around `Sinclair` logo
If untunable (Issue 1 and Issue 2 boards) change IC14
6.6.3 Screen too yellow
Change IC14
6.6.4 Intermittent colour
Change TC2 (Issue 1 and Issue 2 boards)
Change IC14
6.6.5 Red, Blue or Green `Sinclair` logo
Change IC1
6.6.6 Washed out colours
Check TR2
6.7 KEYBOARD FAULTS
6.7.1 KB1 fault
Check for short on 2 or more of the 5 tracks
Change membrane
6.7.2 KB2 fault
Check for short on 2 or more of the 8 tracks
Change membrane
6.7.3 Dead keyboard
Change IC1
6.7.4 Wrong keyboard response
Change IC1
6.7.5 Keyboard response too fast
Change IC1
6.8 REGULATOR COIL
6.8.1 Coil excessively noisy
Change coil