BenQ Q74A, Service Manual

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Q74A Service Manual
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TROUBLESHOOTING
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No operating at all
What you see Suggested Actions
Is the power inserted correctly? Insert the plug correctly referring to the User Manual.
Does the Power Adapter operate
correctly?
Check the Power Adapter.
The green LED is OK.
The Power Adapter operates correctly,
but the LCD Monitor does not operate
correctly.
Check the harness of the FUNC. B/D.
Does The Power On/Off and the LED
Operate corretly?
If the program of the MICOM is error, then exchange the
MICOM.
If the AD B/D is error, then exchange the AD B/D.
The Power On/Off and the LED operate
correctly, but the OSD menu doesn’t
display on screen.
First, operate the FACTORY SET.
Second, check the Panel Harness that is connected to the AD
B/D.
Check the LAMP Harness of the Panel.
Lastly, exchange the LIPS.
The OSD menu operates correctly but
the image doesn’t display on screen.
Insert the SIGNAL Cable correctly referring to the User
Manual.
Check the LAMP Harness of Panel and Inverter.
Lastly, Check the LAMP of Panel.
The Power On/Off operates correctly,
but the screen is ‘ALL WHITE’.
The LAMP is OK.
Check the Panel Harness that is connected to the AD B/D.
The Power On/Off operates correctly,
but the screen is ‘ALL BLACK’.
Check the LAMP Cable.
Check or exchange the LIPS.
Check the Panel Cable.
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