DrCharles
New member
I've had two of those 5" (maybe 6") Samtron monitors on the shelf for many years. I don't remember what I paid for them but it was much less than $49...
I have a Nichibutsu "UFO Robo Dangar" board that is driving me nuts, and finally decided to build a test rig for the bench so I can get to work on it. I should have done my Internet homework before hooking up the Samtron... connecting it directly to the board was the wrong move, as the horizontal output transistor got so hot that the paint on the heat sink smoked and it actually charred the board underneath it!
=:^O
Amazingly, the HOT (a BU406) survived this abuse, (confirmed by testing it switching 250 Vce, removed from the board of course), but after building the correct interface board including sync inversion, there is still no HV and the CRT filament doesn't glow. This leads me to believe the extreme current drawn by the improperly driven HOT has fried the flyback also.
So - does anyone have a parts chassis with a good flyback? Also, is there any source of schematic and service info for this little monitor?
I have a Nichibutsu "UFO Robo Dangar" board that is driving me nuts, and finally decided to build a test rig for the bench so I can get to work on it. I should have done my Internet homework before hooking up the Samtron... connecting it directly to the board was the wrong move, as the horizontal output transistor got so hot that the paint on the heat sink smoked and it actually charred the board underneath it!
=:^O
Amazingly, the HOT (a BU406) survived this abuse, (confirmed by testing it switching 250 Vce, removed from the board of course), but after building the correct interface board including sync inversion, there is still no HV and the CRT filament doesn't glow. This leads me to believe the extreme current drawn by the improperly driven HOT has fried the flyback also.
So - does anyone have a parts chassis with a good flyback? Also, is there any source of schematic and service info for this little monitor?