We've had a win!
Just got back from the garage, here's what I did:
1) Replaced CL18, with a 450v instead. Wrapping was quite shrunk:
2) Replaced the wrong neck board cap that I put in before - CV1. (this hadn't really appeared to have effected anything).
3) I noticed there were cobwebs joining all the terminals under the CRT, so I "disconnected" them:
4) I quickly resoldered the red wire that comes from the flyback/tripler to the neck board, as the solder looked a little wonky. Still doesnt look the best, so I might go back and completely remove all the old&new solder from the joint and do it from scratch.
So, on first powerup, I was greeted with a grey screen with permanent retrace lines. I figured this might be the G2 turned up too high - seeing as it wasnt a particular color, so I went ahead and turned it down. Perhaps this was turned up, overcompensating for a bad cap/joint previously? It looks like the flyback has been replaced at some stage, going by the flux on the joints - and the fact that the pots dont line up with the holes on the back panel housing.
Symptoms:
1) I noticed that for the first 10 seconds as the TV starts up, there are faint horizontal retrace lines with a blue-ish screen color - but they immediately disappear after that time.
Symptom 1 is normal. These sets have something called auto kine bias (AKB) which samples the output of the 3 guns during the vertical blanking interval, then adjusts the drive signal to a preset value. This is a good feature because it compensates for aging of the CRT which would otherwise cause the color temperature to shift over time.
During the first few seconds that the CRT is just starting to warm up, it has to over drive the guns to try to meet their output target. Better sets blank the picture until the CRT warms up. As long as it quickly returns to normal, it's not a problem. If it lingers for a long time, then it's a sign that the CRT is getting weak, or the G2/screen control might need to be adjusted.
This still happens, however it a bit quicker to go away, probably visible for only a second or so.
2) When playing a gun game, the screen flickers bright white, once per pull of the trigger (this is by design of the game, in order for the light-gun to register the location of the shot, here is an example from youtube
however the CRT takes about a quarter of a second to recover properly after each shot, as the brightness decreases for a brief instant immediately following the shot/flicker.
Symptom 2 is probably just because Orion made budget quality TVs with weaker power supplies than say Sony, or Panasonic. It should improve if you turn down the contrast. The default picture settings tend to have the contrast at maximum, which is over driving the picture to make it look bright in the store. It's usually better to have the contrast around 1/3-2/3 of maximum. A CRT isn't going to be as bright as a modern HDR LCD!
This symptom is completely gone, which I'm very pleased about! Screen is also pretty responsive to full brightness changes. I did previously turn down contrast and brightness, but it was still happening.
3) Small vertical line one the left of the frame, running in 4:3 mode. (Picture in general happens to be about 0.5" to the left.)
Symptom 3 also might be normal unless it's a very noticeable line. Are you seeing the edge of the 4x3 raster?
There should be a picture centering control on the main board, or in the service menu. CRT TVs never left the factory perfectly adjusted, so you can usually make big improvements to the geometry with some basic adjustments. Having said that, 0.5" is well within normal tolerances. As I said, Orion was a budget brand, so don't expect top notch performance.
Checking it over for bad caps, and bad soldering is a good idea. It shouldn't need a total recap unless they used really poor capacitors, but if it was used a lot some of them might be heat stressed. Don't expect any miracles since it sounds like it's working as designed.
This is still present, very faint. Yes, only visible on 4:3 mode. However like you said, I'm wondering if after I adjust the horizontal shift and bring the picture back to the right, whether this may subside. We'll see. I think I might be just about ready to have a little tweak in the service menu.
On initial powerup after repairs, there was a minor amount of glitching, on the black AV screen with no input there was the occasional hoizontal line flicking here and there, and with an image on screen the overall color on the screen changed a couple of times, but it appears after about a minute or so, this looked to have gone away. Dodgy connections, or other caps maybe?
I'm very pleased with the progress thus far - very appreciative of everyones input
The project looks very promising!