Sentinel 430 restoration

[bandersen]

I powered up the set with my little patch and was treated to some nice white noise from the speaker that responded to the volume control Instead of HV though I got a loud squeal. Time to check around the horizontal circuits. I replaced a bunch of caps and resistors, but still no luck


I checked out the flyback and it seemed ok so I widened my search and replaced a few more caps. Finally, I got rid of that bug, ugly bumble on the far left and got 10KV Still no picture though. I was going to call it a night until I noticed a flash of light on the 8XP4 test CRT as I turned the set off.


A little more work and I had the first image of sorts.


That was it for day 2.
On to day 3 and more recapping and resistor checking. Making some real progress now.


Good enough to pop the full size CRT in and see if it has any life left.
So close!


A little more work and


However, that's with brightness and contrast at 100% with all the lights off. If I back off on either, the picture quickly fades to black. It's not very pleasant to watch so I fear the CRT really is weak.

So much for a quick recap, but I do know for sure that the set is viable and worthy of spending a a little money on.
I really hate those bumblebees - they look cool but cause so much trouble