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bcollier696, You did not state how many hours of use this small screen monitor has on it!! You may need to replace the CRT if it has been in use for a long time. Can you approximate the total "ON" time of said unit? Is it >10k hrs. Multiply hrs/day x 300 days x yrs of use. If u come up with 15k hrs or more replace the unit with an LCD if possible.
lmistyrel @ aol.com or louie12fix on fixya
Hope this will give you hint in solving this problem. Try configuring monitor settings in OSD mode; contrast; brightness; etc.. other special settings can be accessed using combination of buttons to minimize the raster intensity. On hardware side try resoldering cold soldered points and check the SMPS side.
Check TRC heater voltage (6,3 V., pins 3-4 of TRC socket counting counterclockwise) when picture goes off; if there's no voltage but it appears when picture comes back, look for bad solder joints tracing the circuit backwards to the power supply. Usually, the 6,3 V. tension comes from a single diode-electrolitic cap circuit at the secondary of the power supply transformer.or check this Pin assignment for a monochrome 9-pin D connector are: 1, 2: Ground 3, 4, 5: not connected 6: intensity control (contrast) 7: video signal input 8: horizontal sync. 9: vertical sync. Video monochrome cards usable are:MDA (monochrome display adapter) HGA (Hercules graphics adapter) -Some CGA (Color graphics adapter) and EGA (enhanced graphics adapter) cards that have a switch mono-color can also be used.