[TechAssist] Dell Ultrascan 20TX, 1997 19" computer monitor, low screen voltage, need schematic

This monitor comes on with HV, filaments, and no video for about 5
seconds and then it goes into shutdown with an amber light flashing.
The screen voltage or G2 measures only 4 volts and then drops to zero
when the monitor goes into shutdown.  I found 790 volts on one end of
R463 and 4 volts on the other end.  The 4 volt side is connected to G2
on the picture tube and to the collector of Q403, a C4686 transistor.
R463 measures correctly out of circuit at 2.2 meg ohms.  

Kevin Wilks
Kevin's TV & Video Repair
Penticton BC Canada
kevintv@xxxxxxx 
 



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