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>> No.1817391 [View]
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1817391

>>1817326
>These are caused by an internal test signal, rather than the input signal.
Yeah, my 16:9 hacked Trinitron also does that. But it's actually the TDA4580 doing that which contains plenty of video control functions.

The purpose of this is for measuring the cutoff voltage which is used to prevent overdriving the electron guns.

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