I've got an older Happ Vision Pro model KJ-1915. I'm pretty sure this is a re-branded Kortec KT-1915. It came in dead...no tick...no nothing. I did a cap kit and found a bad diode in the 12 volt output section off the transformer. That brought life back. All voltages are now good, but I don't have an image.....All I have is raster. Looking through Randy Fromm flowcharts at other switching power supply monitors....this seems to point to a blanking issue. I'm not for sure what handles the blanking on this paticular model. Here's schematics for those curious...
http://arcarc.xmission.com/PDF_Monitors/Happ Controls KJ-XX15 13in and 19in Color Raster.pdf
I've swapped U201, Q405, and Q204 (I'm not for sure if this one is even in the blanking circuit)....still just raster.
I'm at a loss. Have I missed something?
Oh yeah, I am sending a good video signal to the monitor
Edward
http://arcarc.xmission.com/PDF_Monitors/Happ Controls KJ-XX15 13in and 19in Color Raster.pdf
I've swapped U201, Q405, and Q204 (I'm not for sure if this one is even in the blanking circuit)....still just raster.
I'm at a loss. Have I missed something?
Oh yeah, I am sending a good video signal to the monitor
Edward
