#1
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Philco Seventeener III - Horizontal Blanking and Retrace lines
I have a couple of Seventeener III sets that both have this problem. When the brightness is set about right I get white retrace (scan) lines at the top of 1/5th of the screen. I can make them disappear if I back off the brightness but this makes the picture too dark.
Seems to be a horizontal blanking issue. I assumed that the issue was related to some bad networks. So I ordered a set from Crist. But sure would like to know where to poke around and discover the actual problem instead of just replacing parts. I have the schematics. I did a complete recap of both sets. This fixed a multitude of issues. but...the retrace lines remain. Last edited by koviatt; 12-14-2018 at 08:38 AM. Reason: Unclear topic |
#2
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Are they constant, or do they come and go? Retrace lines that come and go are due to Copyguard pulses on the source video.
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#3
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They are constant. They are playing on all HDTV OTA tv stations. I'm using blonder tongue modulators to broadcast on different channels..
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