Quote:
Originally Posted by zeno
Measure all the CRT voltages & if you can post the CRT
area of the schematic. Should be easy to figure out.
( dont need focus voltage)
Be sure the kine bias is not to high. It may be a switch.
You should be able to turn the brightness anywhere from
total black to normal without any retrace lines.
Another test put all G-2 ( screen) down & all other controls on normal.
No signal needed. Turn up one G-2 at a time, should turn that
color brightly. If the all come up you can grey scale it by eye.
73 Zeno  |
the problem has always been the hv wont regulate on certain scenes the hv dips to low. the bias is all the way counter as well as the r,g,b drives i cant raise the bias it blooms because of the hv. the drives show the color by turning up one at a time. grey scale i can get ok but the hv dont allow for it all to stay the same scene changes like white will turn reddish because of the lack of hv to support it and voltages were checked reg currant checked cathode, screen voltage, g1, g2,cathode everything is within range but yet the hv refuses to regulate. reg cap off the hv runs away at over 30 kv and its got a new flyback several 3a3 tubes including a solid state 3a3, no difference. either something in the chassis is causing the loading down or this mysterious blue mark that formed over time is the cause. the mark goes from the anode button down to the exterior dag, the mark is inside the glass yet the tube shows very good.