BenQ Q7T4-FP71G - Q7 T4 TROUBLE SHOOTING GUIDE; 1.1 Interface Board

Q7T4-FP71G LCD Monitor Service Guide
Trouble Shooting
1
Confidential
Q7T4 TROUBLE SHOOTING GUIDE
No Display or display is unstable:
1.1 Interface Board:
No picture or picture unstable
Power off Yes Turn on power
No
Does cable plugs in No Check all of wire then turn on power
connector? switch again.
Yes
Does power stable? No Check Power BD
Yes
Is LED light green/orange? No Check control BD
Yes
Is LED status normal? No Check Flash Rom or replace it
Yes
Does crystal work correctly? No Check crystal CKT or replace it
Yes
Is interface BD normally? No Replace interface BD
Yes
Replace panel