Button Function; Osd Is Not Working; Osd Function; Osd Doesn’t Work - BenQ G2420HD Product Service Manual

5.6.2 BUTTON Function:

OSD is not working

Yes
Is control BD connecting?
Yes
Is bottom key normally?
No
Replace Control BD
Is OSD working??
No
Check Interface BD

5.6.3 OSD Function:

OSD doesn't work
Is control BD working?
Check interface BD
No
Yes
N
Y
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Plug control BD then retry
Replace control BD then retry
Replace control BD