ViewSonic PJ755D Service Manual - Page 33

Inspection Procedure, ElevatorFunction, ClockandClockphase, R, G, B and white color contrast

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Page 33 highlights

4-5 Inspection Procedure - ElevatorFunction 1. Pleasecheckandensurethefunctionofelevatorisworkaswell. 2. Ifnot,pleasereturntheunittorepairarea. - KeypadFunction(IncludingRemoteControl) 1. Pleasecheckandensurethecontrolfunctionofkeypadisworkaswell. 2. Ifnot,pleasereturntheunittorepairarea. - ClockandClockphase Test Signal:1024 x 768 @ 75Hz Test Pattern:Fine Line Moire Pattern 1. CheckandseeIfimagesharpnessandfocusinwellperformed. 2. Ifnot,readjustbyfollowingsteps. (a) Enter Image-I,andthenselect"Frequency"functiontoadjustthetotalpixelnumber of pixel clock in one line period. (b) Thenselect"phase"functionanduserightorleftbuttontoadjustthevaluetominimize video flicker. - R,G,Bandwhitecolorcontrast Test Signal:1024 x 768 @ 75Hz Test Pattern:64 RGBW scale pattern 1. Pleasecheckandensureifeachcolorisnormalanddistinguishable. 2. Ifnot,pleasereturntheunittorepairarea. - ScreenUniformity Test Signal:1024 x 768 @ 75Hz Test Pattern:Full white pattern 1. Pleasecheckandensuretheunitisunderthespec.(60%Minimum) 2. Ifnot,pleasereturntheunittorepairarea. - Deadpixel(Brightpixel) Test Signal:1024 x 768 @ 75Hz Test Pattern:Full black pattern 1. Pleasecheckandensuretheunitisunderthespec. 2. Ifnot,pleasereturntheunittorepairarea. ViewSonic Corporation 4-8 PJ755D

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PJ755D
4-8
ViewSonic
Corporation
4-5
Inspection Procedure
-
ElevatorFunction
1.
Please check and ensure the function of elevator is work as well.
2.
If not, please return the unit to repair area.
-
KeypadFunction(IncludingRemoteControl)
1.
Please check and ensure the control function of keypad is work as well.
2.
If not, please return the unit to repair area.
-
ClockandClockphase
Test Signal:1024 x 768 @ 75Hz
TestPattern:FineLineMoirePattern
1.
CheckandseeIfimagesharpnessandfocusinwellperformed.
2.
If not, readjust by following steps.
(a)
Enter
Image-I, and then select “Frequency” function to adjust the total pixel number
of pixel clock in one line period.
(b)
Then select “phase” function and use right or left button to adjust the value to minimize
videoflicker.
-
R, G, B and white color contrast
Test Signal:1024 x 768 @ 75Hz
TestPattern:64RGBWscalepattern
1.
Pleasecheckandensureifeachcolorisnormalanddistinguishable.
2.
If not, please return the unit to repair area.
-
ScreenUniformity
Test Signal:1024 x 768 @ 75Hz
TestPattern:Fullwhitepattern
1.
Pleasecheckandensuretheunitisunderthespec.(60%Minimum)
2.
If not, please return the unit to repair area.
-
Dead pixel (Bright pixel)
Test Signal:1024 x 768 @ 75Hz
TestPattern:Fullblackpattern
1.
Pleasecheckandensuretheunitisunderthespec.
2.
If not, please return the unit to repair area.