Excessive brightness in Monitor EPSON VGA mono
 

Monitor EPSON MM-14S, VGA Monochrome. FCC ID: HSUTRLT-1449 (Main Board
TRL-T1448B Rev 4.2)
At the beginning, a change in brightness and contrast from maximum to
minimum, and viceversa, could be observed for periods of 15 minutes.
Finally, after several days, when turning the monitor on, brightness
and contrast were normal. After 2 minutes' time, the brightness reached an
intense maximum, without any possibility of control by means of brightness,
contrast and sub-bright potentiometers.
What should I check first?
P.S.: Might it be possible to obtain the schematic diagram corresponding
to this monitor (or to a monitor with similar features?)?

Excessive brightness in Monitor EPSON VGA mono
 

Check for high voltage regulation, main power supply regulation, and bias
volt regulation at the CRT elements. Monitor these points to see where the
change is occurring, and trace back from the out of spec points.

--

Greetings,

Jerry Greenberg GLG Technologies GLG
=========================================
WebPage http://www.zoom-one.com
Electronics http://www.zoom-one.com/electron.htm
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wrote in message
...




Monitor EPSON MM-14S, VGA Monochrome. FCC ID: HSUTRLT-1449 (Main Board
TRL-T1448B Rev 4.2)
At the beginning, a change in brightness and contrast from maximum to
minimum, and viceversa, could be observed for periods of 15 minutes.
Finally, after several days, when turning the monitor on, brightness
and contrast were normal. After 2 minutes' time, the brightness reached an
intense maximum, without any possibility of control by means of brightness,
contrast and sub-bright potentiometers.
What should I check first?
P.S.: Might it be possible to obtain the schematic diagram corresponding
to this monitor (or to a monitor with similar features?)?

Excessive brightness in Monitor EPSON VGA mono
 

Thanks for your prompt reply. I'll try it out.
Albert


On Friday the 14th of November 2003 4.07am, "Jerry G." jerryg50@hotmail
com wrote:


Check for high voltage regulation, main power supply
regulation, and bias volt regulation at the CRT elements.
Monitor these points to see where the change is occurring,
and trace back from the out of spec points.



wrote in message
...


Monitor EPSON MM-14S, VGA Monochrome. FCC ID: HSUTRLT-1449 (Main Board
TRL-T1448B Rev 4.2)
At the beginning, a change in brightness and contrast from maximum to
minimum, and viceversa, could be observed for periods of 15 minutes.
Finally, after several days, when turning the monitor on, brightness
and contrast were normal. After 2 minutes' time, the brightness reached an
intense maximum, without any possibility of control by means of brightness,
contrast and sub-bright potentiometers.
What should I check first?
P.S.: Might it be possible to obtain the schematic diagram corresponding
to this monitor (or to a monitor with similar features?)?