Purity Adjustment; Screen Voltage Adjustment; Deflection Adjustment - LG 32FS4D Service Manual

8-1. PURITY adjustment

(1) It makes CPT or CABINET enough to demagnetization.
(2) Receive the signal of red raster.
(3) Loosen fixed screw of DY and closely to CPT funnel part.
(4) Check the center of screen that PURITY MAGNET of CPT
by crossing adjustment. At this time, 4 & 6 pole magnet is
located to magnet of nothing.
(5) Move the DY to make equal red on whole screen and it
does not to make the DY by fixed screw after check a
simple color of Red/Green/Blue and white raster whether
or not it is a pollution of color.
(At this time, take care raster of screen and DY must fixing
in the condition which maintains a horizontality.)
(6) Check the TV set by move direction.
9. CUT-OFF adjustment

(Screen Voltage Adjustment)

9-1. Test equipment
Oscilloscope, 100:1 Probe
9-2. Adjustment
* This adjustment must be operated only at 100Hz DISPLAY
MODE.
(1) Select EZ Adjust 3. CUT-OFF, by pressing the ADJ key on
the SVC Remote control.
When it enters to adjustment mode, the pattern from a
signal generator is being selected, it becomes with Normal
image 16:9 and the CUT-OFF DRIVE data setting 31.
(2) Connect the oscilloscope ground lead to GND on the CPT
board and the probe to the GK pin connector of the CPT
socket.
Using the SCREEN knob on the Fly Back Transformer,
adjust the black level voltage to 160±2V.
<Fig . 8> CUT-OFF adjustment

10. Deflection adjustment

10-1. 16:9 deflection adjustment
Actual screen size
A
(a)
160 – 2V
B
(b)
<Fig . 9>
* This adjustment must be operated after changing signal
to Multi signal.
- Adjustment sequence
NTSC H,V adjustment --> HRS correction --> NTSC H,V
re-adjustment(60Hz) --> PAL H,V adjustment(100Hz) -->
PAL H,V adjustment(50Hz) --> PAL(50Hz) 4:3 adjustment
- MULTI 48ch, STANDARD, 16:9 screen is displayed when
Digital pattern is 50/100Hz or PAL B/G(EU05CH) or 60Hz
at H,V adjustment mode.
(1) 60Hz Vertical Deflection Size adjustment
1) Select "EZ Adjust 1. Raster, Cent, H/V Size(60Hz)" by
using the ADJ key on the SVC Remote control.
2) Select "V-SIZE" in the adjustment mode.
3) Adjust until the smaller inscribed circle coincides with
the outer frame of screen.
4) Select 95. LO-VLIN or 94. UP-VLIN and adjust until the
larger inscribed circle coincides with the outer frame of
screen.
L-LIN
<Fig . 10> CUT-OFF adjustment
(2) Raster H-center (H. CENTER) adjustment
: Select "77. H Position" in the adjustment mode and adjust
until left and right screen are symmetrically equal.
(3) Raster V-center (V. CENTER) adjustment
: Select "1. V-Position" in the adjustment mode and adjust
it to position the vertical center line in vertical center of
the CPT.
(4) Vertical Deflection Size Adjustment
1) Reduce "4. H-Size" to verify screen protection
(overscan) on the right and left sides.
2) In the adjustment mode, the third on the 48CH pattern is
to be located in the outer angle as adjusting th H-SIZE.
(5) HRS switch adjustment(only 60Hz display mode)
A(Left)
Left
F
<Fig . 11> MULTI CH48
U-LIN
B(Right)
Neutrality
Right
F
SW1401