25
Main power adjustment:
Adjustment: Connect voltage meter to +B on main PCB, make +B voltage be 110V
±
0.3V.
Screen voltage adjustment:
Adjustment: Tune TV on, receive a digital test pattern, set brightness and contrast standard
mode. Press
“
FACTORY
”
button on the service remote controller twice,
”
B/W balance display on
the screen, then press
“
MUTE
”
button, and make a horizontal bright line display on the screen.
Adjust Screen voltage of FBT, make the line just seen. Then press
“
MUTE
”
button and exit service
mode. Press
“
P.STD
”
button and make picture enter standard mode.
AGC ALIGNMENT:
Receive a color bar signal, 60dB,NTSC M color bar pattern, and check if there is noise in the picture, if there is
noise, press FACTORY button and enter service mode, adjust RF.AGC value and make the noise just disappear,
press FACTORY button and exit service mode.
White balance adjustment:
Turn TV on, receive white field signal, and make the probe of white balance adjustment instrument touch with
top and bottom of screen fully. Check if values of R, G, B are standard, if not, press “FACTORY” button, make
“B/W BALANCE” menu display on screen, adjust values of R-BIA, G-BIA, B-IA, R-DRV, G-DRV, B-DRV,
make them standard. Press FACTORY button, exit service mode.
OSD
I2C bus control (LA76810)
Varied range
S-BRI Sub
brightness
0-127
R-BIA Red
bias
0-255
G-BIA Green
bias
0-255
B-BIA Blue
bias
0-255
R-DRV Red
drive
0-127
G-DRV Green
drive
0-15
B-DRV Blue
drive
0-127
C.B/W Cross
B/W
0-3
FOCUS ALIGNMENT
Receive crosshatch (N system) pattern; Adjust focus-variable resistor on the FBT, make picture is the
sharpest.
Adjustment
Summary of Contents for HTX21S31
Page 12: ...11 6 Net dimension Haier Net dimension ...
Page 19: ...18 11 Circuit Diagram Circuit Diagram ...
Page 22: ...21 PCB ...
