Prima LC-20S3 Service Manual page 6

3. Written program
Written program of IC(N101, N304)
4. Main board adjustment
a. According to wiring diagram, connect main board to supply power, the indicator to red.
b. Press the POWER button in the senor control, the indicator to blue
c. Check the picture and sound is normal of TV/SCART/YPBPR/RGB/DVI channel.
4. Aging
a. Install the set
b. Turn on the set, select the TV channel, then let the set no signal in state.
Aging one hour.
c.
5. White balance
a. Enter RGB channel
b. Input grid signal(C_Hat_16x12(w)) of 60Hz of VGA terminal, resolution to 640 x 480 of in
optimum resolution. Adjust H-center and V-center, let to the picture normal.
c. Input gray(H)-16 signal, enter the factory menu, select "VGA AUTO COLOR"
d. Exit the factory menu, select the YPBPR/YCBCR channel
e. Input the YPBPR signal, adjust different signal.
Input gray(H)-8 signal, using the CA-210 test the third level, adjust brightness and contrast, let
f.
brightness to 180nit, enter factory menu, still the green color temperature value, adjust blue
color temperature and red color temperature, let to x=0.284±0.02, y=0.299±0.02
6. Performance Inspections
6.1 TV function
Enter the search menu → auto search, connect RF-TV terminal to the central signal source, check if
there is station skipping.
6.2 AV/S input terminal
Input AV/S signal, check the picture and sound is normal
6.3 VGA terminal
Input the VGA signal (table 1), and auto correction it, check the picture and sound is normal.
Resolution
640x480 @ 60
640x480 @ 75
720x400 @ 70
800x600 @ 60
800x600 @ 75
6.4 YPBPR/YCBCR terminal
Input YPBPR/YCBCR signal(table 2), and auto correction it, check the picture and sound is normal.
resolution
1 768x576@50i
2 776x482@60i
Table1 VGA signal format
Pixel clock (MHz)
25.175
31.500
28.322
40.000
49.500
Table 2 YPbPr/YCbCr signal format
Pixel clock (MHz)
14.750
15.734
H-SYNC (KHz)
31.469
37.500
31.469
37.879
46.875
H-SYNC (KHz)
15.625
15.734
4
V-SYNC (Hz)
59.900
75.000
70.086
60.317
75.000
V-SYNC (Hz)
50
60