Noise in image on Viewsonic VX2255WMB

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    Removing electrical noise introduced by fan
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    Hi all,

    I am working on a sound processor, it tends to overheat so I fitted a fan inside. The fan is connected to the +15V of the PSU via a DC-DC converter based on the LM2596 to reduce the voltage to around 10.5V.

    Unfortunately the analogue circuitry is picking up the noise from the fan in two ways:
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