YAKUMO TFT 15 SL, Manual

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5.2 Troubleshooting
Before calling for service, check the information in this section to see if you
can remedy any problems by yourself. If you need assistance, please call the
dealer where you purchased the LCD monitor.
There is no SCREEN image
The power cord is securely connected to the monitor, the adaptor, and
the wall outlet.
Check the signal cable connection between the monitor and the computer.
Adjust the brightness and contrast controls.
Monitor in power saving mode.
Display image is too large or too small
Use the OSD controls to adjust Auto Setup.
The colors are distorted
Signal cable properly connected.
Use OSD controls to adjust the color control setting.
The image is too light or too dark
Use OSD controls to adjust the brightness and contrast.
There is no sound or sound is low
Check the sound cable connection
Make sure the computer sound program is working
Adjust the volume on sound setting. Adjust your sound card or
computer volume setting.
Adjust the volume control keys on the monitor