Trouble Shooting Guide; No Display Or Display Is Unstable On Analog Or Digital Port; Interface Board - BenQ G2220HD Product Service Manual

5.6. Trouble Shooting Guide

5.6.1 No Display or display is unstable on analog or digital port:

5.6.1.1 Interface Board:

No picture or picture unstable on
analog port and DVI port
Power off
N
Does cable plugs in connector?
Y
Does power stable?
Y
Is Power LED light Green or amber?
Y
Is Power LED status normal?
Y
Does crystal work correctly?
Y
Is interface BD normally?
Y
Is LVDS cable connect OK (to J6
and Panel)?
Y
Replace panel
Y
Turn on power
N
Plug the cable then turn
on power again
N
Check Power Board DC-
DC circuit and regulator
N
Check Key BD and Key
BD cable
N
Replace IF BD
N
Check crystal CKT or
replace it (Y1)
N
Replace interface BD
N
Plug LVDS cable again
or replace it
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