ViewSonic G790 19" CRT Monitor Logo

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Posted on Jan 26, 2008
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Screen problems i turned my computer on and its jumping.just a little though.it just started doing it a couple of hours ago

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  • Expert 123 Answers
  • Posted on Jan 26, 2008
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Joined: Jan 25, 2008
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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.

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