HL720S/D Service Manual
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Doesn’t display on LCD
“VIDEO MODE NOT SUPPORTED”
message
[Window 98, 98 second, Me,2000]
Reboot safe mode. (press the F8 key).
Setting Resolution 1280*1024 in display properties
menu and then setting 60Hz vertical frequency.
You can see resolution information the lower end of
OSD menu when you push the menu button.
[Window XP ]
After reboot a computer, display booting menu on
screen by press the F8 key.
Select VGA mode and then setting Resolution
1280*1024 in display properties menu and setting 60Hz
vertical frequency.
“No signal” message
Check the signal cable.
Check DPMS mode in PC.
Check pins of the signal cable.
If PC keeps DPMS status
Continually
(No signal Input,
LED color amber)
Check the signal cable.
Check pins of the signal cable.
Check HS_VGA and VS_VGA in schematics.
Doesn’t display on screen
Correctly include OSD menu
Check scaler output signal.
Check panel harness between panel and AD B/D.
Check solder status of the scaler.
Doesn’t display on screen
Correctly except OSD menu
Check the signal cable.
Check scaler input signal (RGB,H-SYNC,V-SYNC)
Noise in vertical pattern. Execute
Auto
Config.
According to graphic card.
Check 60Hz vertical frequency in display properties.
Display position error
Auto Config
Display position error occurred on dark or moving
picture.(like game)
In this case, you must execute Auto Config in windows
screen.
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