Busted Sony 1210 Fixed!!

[Eric H]

Well I have made some progress with this set.

I installed the NTE Transistor but still only had a vertical line on screen, did a little poking around and discovered I had left out the two plastic insulators that go over the screws for the transistor, I discovered this when I saw one of the insulators laying inside the Flyback cage.

I thought it something was amiss when I installed it but didn't know what until I discovered the case was at ground potential.

Anyway, fixed that problem and tried it again and now the set wouldn't turn on, got CRT heaters but no sound or HV, I figured I blew something up by leaving out the insulators but it had been running right before I shut it off, it had also been running with the old transistor installed the same way, in fact I wonder if it might have been fixed after I recapped the Oscillator board but I installed the T'sistor wrong? Well, not worth swapping it to find out now.

Checked fuses, checked voltages, had 114v on both of the large Transistors and nothing was smoking but it just didn't run.

Checked the Horiz Osc Transistor and it was good, finally I was just poking my meter around checking for B+ and I heard the HV crackle on, I have no idea what I did, checked the screen and now I have a full raster and good sound, however I don't have any video and the Brightness and Picture controls do nothing, the CRT is biased full on on all three guns, there may be a picture but I can't see it with the CRT turned full on.

Still working without a schematic, any ideas what would kick all three guns full on? Brightness control has zero effect.