Repairing a ZX Spectrum 128K +2 (serial no U-043583) - Part 5

In part 4, I re-checked the onboard power supply voltages and made some adjustments to the +12V supply which was measuring a low 10.98V but even with +12V on the 12V line the ghost image still remained.

The final fix was found when someone on world of spectrum suggested the TV might be displaying both the composite video and the RGB video signal resulting in the two images on the screen. Initially, I thought the  cable I had bought was only wired for composite but on rechecking (this time measuring for resistance rather than continuity, oops!) it turns out the RGB pins are also wired.

The SCART to HDMI converter that I am using has no means of forcing selection of RGB or composite video in on the SCART input so as an experiment I connected an alkaline battery to the SCART "blanking" pin 16 to force RGB selection and the ghost image was gone.

Finally, it is now fixed and the display looks amazing!

Fixed display with no ghost image