Zenith PRO 841x/851x

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      >> Focus Block Replacement 
      >> CRT Tube Replacement 
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Convergence board

Shown below is the convergence board. It is a relatively reliable board, the worst thing that seems to happen with these boards is that the controls get noisy if used in a sports bar. A simple shot of control cleaner into the trimpots make the geometry and convergence controls work smoothly again.