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Golf · Guest

Yep, still kicking my but, but getting closer. I found the +9V supply
to the convergence board to be only about 4.7V. Did some resoldering
on a few plugs and got this back to normal. Prior to this it would
display misconverged colored snow. Anyway, with a color bar signal
input at the coax, I have just a black raster. I do see OSD of channel
number clearly, which is better than before the 9V problem was
corrected.
I did disconnect a diode in the powerdown Vertical def circuit
to keep set powered up for troubleshooting. It is from the Vertical
Ret (retrace?). I checked the waveform at the vertical input on the
convergence board and it is clean and good. I haven't found anything
about the vertical ret. on the schematic as far as what I should see,
to determine why this circuit is at fault. I have already replaced the
vertical/current amplifier IC, and checked many discreet components in
this circuit.
This is where I'm needing your help - I'm not familiar with
"vertical ret". What is it's function in the set? Will it prevent the
raster from displaying normal brightness? No vertical signal provides
nice bright horizontal line. Is this a clue to the fault? I've googled
and haven't found much help on "vertical ret". Thankyou for any help
here. Please keep in mind I have only been working on TV's for a few
years - no professional training obviously. Thanks again.