BenQ Q74A, Service Manual

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Q74A Service Manual
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Doesn’t display on LCD
“
VIDEO MODE NOT
SUPPORTED
” message
[Windows]
Reboot safe mode. (press the F8 key during booting).
Remove GraphicCard Driver.
Reboot normal mode.
Reinstall GraphicCard Driver.
“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 Adjust.
According to graphic card.
Check 60Hz vertical frequency in display properties.
Display position error Execute Auto Adjust
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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