LG RT-44NA10T Service Manual page 12

●High Voltage Regulation Adjustment
1. Test Equipment
Digital Multi-Meter(DMM)
2. Preliminary steps
1) Switch picture mode to STANDARD in no signal input.
3. Adjustment
1) Connect "+" terminal(Red) of DMM to the Anode of D432
and "-" terminal(Black) to the Heat Sink of Q406.
2) Adjust VR401 so that the D432 terminal voltage is 17.3±
0.1V.
●CUT-OFF Adjustment
1) Press the "SVC" button and then press the "
the remote controller for adjustment to display horizontal
.
line (Even though you enter into the SVC mode, the
horizontal line might not be seen according to the position
of Screen Volume.)
2) Adjust Screen Volume (R/G/B) in Focus Pack until
brightness of red/blue/green horizontal line is about not to
be seen.(At this moment, brightness of red, blue or green
horizontal line should be equal to one another.)
3) Exit the adjustment mode by pressing the "
●Deflection Adjustment
1. Preliminary steps
1) Adjust differently based on input signal such as NTSC or
PAL.
2) NTSC adjustment should be done in STANDARD mode of
picture after receving 13CH signal,and PAL adjustment
should be done in STANDARD mode of picture after
receving EU05 CH.
3) Reset the data in convergence adjustment mode,quit the
mode.
Convergence Mode : SVC,
Data reset : 5 , OK
Adjustment mode out :
2. PAL Mode Deflection Adjustment
1) At SVC mode,press the YELLOW key get into the deflection
adjustment mode.
2) VS (Vertical Shift)
Adjust until geometric vertical certer line of the screen is
accord with the vertical center line of the screen JIG at EU
05 CH by pressing the VOLUME ◀, ▶ button.
3) VA (Vertical Amplitude)
Adjust until fifth vertical line from upper and lower center of
the screen is accord with the edge of the frame.
M M
M M
Outmost Vertical Line
Fifth Vertical Line
4) VL (Vertical Linearity)
Adjust so that the boundary line between upper and lower half is
in accord with geometric horizontal center of the CPT.
5) SC (Vertical "S" Correction)
Adjust so that all distance between each horizontal lines are
to be the same.
6) HS (Horizontal Shift)
Adjust so that the horizontal center line of a digital circle pattern
is in accord with geometric horizontal center of the CPT.
7) EW (East-west Width)
Adjust until the outermost left and right vertical line of the
screen is accord with the edge of the frame.
" button on
8) ET(East-west Trapezium)
Adjust to make the length of top horizontal line same with it
of the bottom horizontal line.
9) EP (East-west Parabolar)
Adjust so that middle portion of the outermost left and right
vertical line looks like parallel with vertical lines of the CPT.
10) ES (East-west Symmetric)
" button.
After EP adjustment, adjust until deflection rate of upper
and lower screen corner is same.
11) EC (East-west Coner)
Adjust so that the vertical line at every 4 corners of the
screen looks like parallel with the vertical lines of the CPT.
12) POP P(POP Position)
After PAL signal is received in the main screen, adjust left
and right position of the POP screen until left vertical side
of the POP screen is accord with the main screen.
Caution : Store the data of deflection adjustment in
EEPROM with the "OK" button before POP P adjustment
13) Store the adjusted data in EEPROM by pressing the "OK"
button before exiting adjustment mode.
14) Restore the convergence correction data by pressing the
"TV/AV" button before exiting adjustment mode
3. NTSC Mode Deflection Adjustment
1) Adjust vertical size (VA Adjustment) until fourth vertical bar
from upper and lower center screen is accord with the edge
of the frame.
2) Adjust horizontal size (EW Adjustment) until third bar to
indicate horizontal size of circle is accord with the edge of
the frame.
3) Do other adjustments the same as in PAL mode.
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Fourth Vertical Line
Third Bar