4
5 Adjustment and calibration for the TV board
Connect the main board X501 to infrared receiving board (as per wiring diagram 203-L20H80-01JL)
and press the POWER key on the remote control set. Now Now the indication lamp of the infrared
receiving board is blue. Measure N3 PIN2 of TV board to be 3.3 V, one terminal of inductor L107 to
be 5 V and one terminal of inductor L4 to be 12 V
6 Adjustment of white balance (using the white balancer CA210 and K7253 signal generator
specialized for LCD)
a) Install the whole TV set
b) Enter the factory menu and perform”PW1306 reset”
c) Exit from the factory menu. Press “signal source” key and enter YpbPr.
d) Input YpbPr signal: 640x480p 60Hz (K7253).
e) Enter the user menu. Set the brightness to 50 and contrast to 50. Press “factory” key to enter
the factory menu, perform “ADC calibration”, input signals of “black field”(EMPT),”white
field”(White-(100%))”fully red”(Full_Magenta)respectively and then calibrate three times.
f) Input signal of “four grade gray”(Gray(H)-4 ). Use CA-210 to measure the third grade and adjust
the brightness and contrast so that Y is around 150. Enter factory menu and adjust the green
color temperature and blue color temperature so that x=270,y=283(red color temperature is
constant as128).
g)
Exit from the factory menu and enter route RGB. Input 640x480 @75Hz “pane
signal”(C_Hat_16x12(W))through port VGA. Enter the user menu and adjust the brightness to
50 and contrast to 50. Adjust the line center and the field center so that the picture is correctly
positioned.
h) Input signal of “16 gray grades” (Gray(H)-16). Enter the factory menu and perform “calibration of
ADC”.
i) Exit from the factory menu, input the signal of “four grade gray” (Gray(H)-4 )and enter the user
menu. Adjust the brightness and contrast. Use CA-210 to measure the third grade so that Y is
around 200. Enter the factory menu and adjust the green color temperature and blue color
temperature so that x=270,y=283(red color temperature is constant as128).
j) Enter TV mode and adjust channel No. Enter “D8”signal and adjust the color to 0. Adjust the
brightness and contrast. Use CA-210 to measure the third grade so that Y is around 200.
k) Enter the factory menu and adjust the green color temperature and blue color temperature so
that x=270,y=283(red color temperature is fixed as128).
7 Performance check
a) TV Interfaces
Connect RF port to central signal source. Enter station search menu - auto station search. After
system adjustment is over, check if there is any station missing and then check semi-auto station
search. Check if fine tuning is normal.
Check if the output of earphone or loudspeaker is normal and if the picture is normal.
b) Interface of AV/S Terminals
Connect to access the signal of AV/S terminals separately and check if the picture or sound is
normal.
c) AV OUT Termianl
Input the signals separately in the status of TV/AV/S terminal. Connect AV OUT terminal to monitor
and check if the output picture and sound from AV OUT is normal. (Note: In the status of S terminal,
