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Purity Adjustment; Purity & Convergence Adjustment; Focus Adjustment - LG 29FS2AMB/ANX Service Manual

Lg color tv service manual
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4. DVCO Adjustment
1) This adjustment applies to the frame assembly unit
2) This adjustment is to adjust the crystal oscillator frequency of
VCTP IC and is done after receiving the PAL B/G digital
pattern signal.
3) If you press the ADJ button to enter the SCREEN mode,
DVCO adjustment is automatically done.
(T/X may not operate properly during DVC0 adjustment.)
5. Temporary screen voltage adjustment
1) This adjustment applies to the frame assembly unit
2) Enter Screen Mode with ADJ button. Turn the screen volume
to disappear horizontal line.

6. Focus Adjustment

6-1. Preliminary steps
Receive the PAL-B/G 07ch(Cross hatch pattern, <Fig 6>) and
Set the picture mode to "STANDARD".
6-2. Adjustment
1) Adjust the lower Focus volume of FBT for the best focus of
vertical line B.
2) Adjust the upper Focus volume of FBT for the best focus of
area A.
3) Repeat above step 1) and 2) for the best overall focus.
<Fig. 1>
7. Purity & Convergence adjustment
Adjustment should be operated when using the CPT(without
ITC from CPT manufacturing place)
This adjustment must be done in the order of the following
CPT Assembling
Assembling DY to
STC Pre-Adjustment

PURITY Adjustment

DY Fixing
SCREEN Voltage adj.
W/B Fixing
FOCUS not yet ADJ.
STC not yet ADJ.
DYC not yet ADJ.
7-1. 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.
7-2. Convergence adjustment
These adjustments can the best condition of focus after finished
purity adjustment.
(1) Receive the signal of cross hatch that BACK RASTER is
(2) Adjust brightness and luminosity till dot appear 9 ~12.
(3) Open angle of the two tab of 4 pole MAGNET by isogonic
angle and accord with vertical line of red and blue color in
the middle of screen.
(4) Maintain as angle of (3) and rotate the tab to accord with
vertical line of Red and Blue color in the middle of screen.
- 9 -
As preparatory operations before
assembling CPT, wind cotton Tape for
protecting to CPT NECK and DY, CPT
connection parts. At this moment, end
of tape should be over-lapped and
wound in direct route to the NECK.
Fix the Magnet to the position as
shown picture below. Be careful not to
make CPT neck shadow while
adjusting DY.
Convergence Magnet
15 ~ 20mm
Let the screen Standard condition.
Operate Heat-Run at least 15
Torque is to be 9-11 kg when
fixing DY.

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