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General Purpose LCD Monitors Trouble Shooting Guide | en 23
Bosch Security Systems, Inc. User’s Manual F.01U.127.338 | 2.0 | 2009.05
9 Trouble Shooting Guide
Problem Solution
No image is displayed on screen – Check that the power cord of the monitor is securely connected into the
wall outlet or grounded extension cable or strip.
– Power switch should be in the ON position and the LED lit.
– Check that the Brightness and/or Contrast adjustments of the display have
not been turned down to minimum levels.
“Check Input Signal” message is
displayed in PC mode
– The signal cable should be completely connected to the video card/
computer.
– The video card should be completely seated in its slot and the computer
switched ON.
Display image is not centered, is
too small, or too large in the PC
mode
Push the down key to activate the Autoset function.
Vertical or horizontal noise is
present in the picture in PC mode
Adjust the Clock and Phase in the OSD submenu.
Incorrect colors – Press the Menu button on the front panel of the monitor, then press the
right arrow to select the Color menu. Press the down arrow on the front
panel and select 9300K or 6500K.
- or -
– Press the Menu button on the front panel of the monitor, then press the
right arrow to select the Utility menu. Press the down arrow on the front
panel and select Recall to reset to the default settings.
The error message “Unsupport
Mode” is displayed
PC is operating with either a resolution or timing mode that is not supported.
Change the PC timing mode to one of the valid combinations below:
Timing mode
640 x 480; 60/72/75 Hz
800 x 600; 60/72/75 Hz
1024 x 768; 60/70/75 Hz
1280 x 1024; 60/75 Hz (17 and 19 inch only)