I was recapping my zx spectrum when after just replacing one specific capacitor it stopped working as before.

The picture has multiple horizontal lines over the entire display.

This is especially noticable with yellow, cyan and magenta as they show the 2 colour that make each up repectively.

Does anyone know how this problem can be solved?

  • 5
    Are you able to add a picture showing what you mean? Jun 4, 2018 at 10:36
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    Sounds like the preemptive recapping war has claimed another casualty. Also sounds like you were doing one cap at a time. SO, you know where the problem likely exists. Check all the obvious problems with your new cap and corresponding (de)soldering efforts.
    – Brian H
    Jun 4, 2018 at 15:02
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    It would help if you added a picture. Also, please read the tour so that you're familiar with the Stack Exchange model.
    – wizzwizz4
    Jun 4, 2018 at 16:08
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    The description sounds like Hanover bars (en.wikipedia.org/wiki/Hanover_bars), and if so, the fault will be around the TV modulator circuitry. However, without a bit more detail such as which model of Spectrum or which capacitor change caused the fault, it's impossible to say for sure what the actual problem is.
    – pndc
    Jul 5, 2018 at 10:01

1 Answer 1


If this is what is displayed when the Spectrum is powered up, then it could be showing a memory problem. Without more information, it is not easy to say.

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