BenQ Q7T3 Series Manuale utente

Q7T3(CPT panel) LCD Monitor Service Guide

Trouble Shooting

1

Q7T3-CPT TROUBLE SHOOTING GUIDE

1.No Display or display is unstable

Nopictureorpictureunstable

Poweroff Yes Turnonpower

No

Doescableplugsin No Checkallofwirethenturnonpower

connector? switchagain.

Yes

Doespowerstable? No CheckPowerBD

Yes

IsLEDlightgreen/orange? No CheckcontrolBD

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

Q7T3(CPT panel) LCD Monitor Service Guide

Trouble Shooting

2

2. BUTTON function:

OSDisnotworking

Yes

IscontrolBDconnecting? No PlugcontrolBDthenretry

Yes

Is bottom switch normally? Yes Replace control BD then retry

No

Replace Control BD

IsOSDworking??

No

Check Interface BD

3. OSD function:

OSD doesn’t work

Is control BD working? No Replace control BD

Check interface BD

Q7T3(CPT panel) LCD Monitor Service Guide

Trouble Shooting

3

4. Power Board

Backlight didn't shine

LED shined?

3.3V existed? IS I/F board connected?

IC751 PIN 9 IS 15V?Replace Q761

PWM existed?

(BLT_ADJ)

Plug CN701 again or

checking I/F BD

Turn on level existed?

(BLT_ON)

Insert them again Check CN752, CN753

was pluged properly?

Plug CN601 again or

checking PW BD

Replace IC751,Q751

Replace new fuse

Replace new fuse

Check IC701 OK?

Checking F601

Broke?

Check IC601 Vcc

existed?

Replace IC602,

IC702,D702 or check

I/F BD

Replace IC701

Replace new fuse

Replace

IC601,ZD601,C606,

C611

Y

N

N

N

N

Y

Y

Y

Y

N

Y

YN

N

Y

Y

Y

N

N

N

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