I'm still pretty new to all of this and learning. How would I go about check the HBC? I should be able to get my hands on just about any piece of equipment for testing, so that shouldn't be an issue. Just need to know how.

Also, I have the option of purchasing a new 9-57 module (horizontal board). Is it worth it to swap them or is this issue most likely not on the module itself?

Thanks

buy a schematic, get s scope, find someone that knows how to use it, check the blanking pulse from the fly back to the video amp, if incorrect apply normal diagnostics to the circuit involved.

I found these tips in some old Zenith Tech Topics I have - hope they help in some way - perhaps not now, but in the future.



Cheers,

I wouldnt bother, the only thing on them was the 330 ohm resistors
like the ones on the 9-90 used in the upright.
IIRC there was a board to fix tearing from VCR's. It was
sold as 9-57VCR or something like that. Had an IC on it &
a hold adj. Ifyou find that buy it There
was a bulletin about it, IIRC even had improvements for 6U10
sets. Way to long ago, maybe someone has a collection of them,
mine long gone................73 Zeno:smoke: