Last few days I just read everything in manual from start to end, sometimes backwards, to try to understand as good as possible how this scope works (CPU and display board).
Siggi was right about signal on Ch4 having some issues.
Three new clips in Dropbox (name starts with 3., then 4. and 5.; all after CLEAR MENU pressed):
The first one shows scope screen; Ch1 and Ch4 on display, no input signal on any channel; on Vertical, button Ch1 pressed and Ch1 light ON; nothing unusual (disregard fuzziness, it's angle of camera)
The second one shows scope screen; Ch1 and Ch4 on display, no input signal on any channel; on Vertical, button Ch4 pressed and Ch4 light ON; some vectors on Ch4 show in red; if I switch to dots (in Display), some dots will show red.
The third one shows VGA monitor screen; Ch1 and Ch4 on display, no input signal on any channel; on Vertical, button Ch4 pressed and Ch4 light ON; same information as above but on VGA monitor - no red vectors (not obvious, but to naked eye Ch4 is blue on VGA too).
Previous idea stays (that everything is correct, up to the point where information is split between VGA path and Video path). Not ready to make assumptions, I'll wait a little, so the stuff settles in my mind; it seems everyday is clearer, but still some way to go...
TT
