Text preview for : Q7C3-trouble shooting.pdf part of BENQ FP767( Q7C3) S.M.
Back to : BENQ FP767( Q7C3).rar | Home
Q7C3 LCD Monitor Service Guide Trouble Shooting
Q7C3 TROUBLE SHOOTING GUIDE No Display or display is unstable: 1.1 Interface Board:
No picture or picture unstable
Power off No
Yes
Turn on power
Does cable plugs in connector? Yes
No
Check all of wire then turn on power switch again.
Does power stable? Yes
No
Check Power BD
Is LED light green/orange? Yes
No
Check control BD
Is LED status normal? Yes
No
Check Flash Rom or replace it
Does crystal work correctly? Yes
No
Check crystal CKT or replace it
Is interface BD normally? Yes
No
Replace interface BD
Replace panel
1
Q7C3 LCD Monitor Service Guide Trouble Shooting
2. BUTTON function:
2.1 Control Board
OSD is not working Yes
Is control BD connecting?
No
Plug control BD then retry
Yes
Is bottom switch normally?
Yes
Replace control BD then retry
No Replace Control BD Is OSD working??
No Check Interface BD
2
Q7C3 LCD Monitor Service Guide Trouble Shooting
3. OSD function:
OSD doesn't work
Is control BD working?
No
Replace control BD
Check interface BD
3
Q7C3 LCD Monitor Service Guide Trouble Shooting
4. Power Board
Backlight didn't shine
Y Check IC751
Y IC751 PIN 9 IS 1416V? N LED shined? N Y PWM existed? (BLT_ADJ) Y 3.3V existed? Y Replace new fuse Turn on level existed? (BLT_ON) Y N IS I/F board connected? N
N Plug CN701 again or checking I/F BD
N Plug CN601 again or checking PW BD
Replace new fuse Y
N Insert them again Check CN752, CN753 was pluged properly? Y N Replace IC751,Q751 Checking F601 Broke? N Check IC701 OK?
Replace IC701
Y Replace new fuse
Y Check IC601 Vcc existed? N
Replace IC601,Q602,Q603 R602
Replace IC602, IC702,D701 or check I/F BD
4