Art.

Thanks for the info. The drive and output transistors are on the main board
and I hoped that by swapping some signals on the crt board, it would reveal
the problem. I don't have a signal generator or any way to display a
picture other than snow which I would assume would be black and white. The
OSD is green as is the snow. I have an old CRT tester (B&K 465) however no
adaptor for the tube. I may try to build one out of an old crt board
socket..

My multimeter shows about +20vac at each of the crt cathodes. That seems a
bit low since the Sams PF shows +160vac on them. I'm gonna try my scope on
the signals and see what sort of peak readings I get.

I have a tube/yoke from another set however the crt numbers are totally
different: A63AAX02X vs A63KTM96X. Something tells me that I can't swap 'em
and probably would pull my hair out trying to get a decent picture even if I
could.

I'll go back to the Sams PF and check voltages at the transistors. One
thing I did note is that the red and blue both have higher voltages on the
schematic, does this mean the blue and red are adjustable while the green is
set to a reference? Or am I just nutz?

Kirk S.
"Art" wrote in message
...
Drive transistors, jungle ic, video outputs, etc. What potentials do you
have at the cathodes, drive and output transistors??
"Kirk S." wrote in message
...
Hi all,

Thought I had this one figured out as an H/K short however, I'm wrong...

a) isolated heater and picture is still green
b) swapped red/green signals to the crt board and still green
c) voltages to the crt board for red/green/blue all similar

Next step is to lift the final resistor to the green cathode and swap
with
red or blue. Perhaps look at the cathode voltages with an o-scope? I
didn't find any shorts between the cathodes and heater terminals on the
crt
board.

If I don't have an H/K short, what would cause a green picture? I do
not
have full on w/retrace lines as I would have expected. Could something
have
shifted in the CRT to only have the green phosphors hit? Spark gap bad?

Suggestions?

Thanks!

Kirk S.