BenQ G2220HD - 5.6. Trouble Shooting Guide

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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
Does cable plugs in connector?
Does power stable?
Turn on power
Y
N
Plug the cable then turn
on power again
Check Power Board DC-
DC circuit and regulator
Y
N
N
Y
Is Power LED light Green or amber?
Check Key BD and Key
BD cable
N
Y
Is Power LED status normal?
Replace IF BD
N
Check crystal CKT or
replace it (Y1)
N
Replace interface BD
N
Does crystal work correctly?
Is interface BD normally?
Replace panel
Y
Y
Y
Is LVDS cable connect OK (to J6
and Panel)?
N
Plug LVDS cable again
or replace it
Y