Adjustment Instructions - LG 21FS4RLX Service Manual

1. Application Object
These instructions are applied to all of the color TV, CW62B.
2. Notes
(1) Because this is not a hot chassis, it is not necessary to use
an isolation transformer. However, the use of isolation
transformer will help protect test instrument.
(2) Adjustment must be done in the correct order.But the
adjustment can be changed by consideration of mass
production.
(3) The adjustment must be performed in the circumstance of
25±5°C of temperature and 65±10% of relative humidity if
there is no specific designation.
(4) The input AC voltage of the receiver must keep rating
voltage in adjusting.
(5) The receiver must be operated for about 20 minutes prior
to the adjustment.
(6) Signal: Received, the standard color signal.(65dB±1dB uV)
LG standard signal means the digital pattern
(PAL_EU 05CH,NTSC_US 13CH).
3. Focus adjustment
(1) Receive the Cross-Hatch Pattern(Fig 1).
(2) Set the picture condition on "DYNAMIC(CLEAR)" mode.
(3) Adjust the Focus volume of FBT,made the focus of the 1/4
part vertical line is best.
A
<Fig. 1> Cross-Hatch Pattern (NTSC : US 09CH, PAL : E-7CH)
Copyright©2007 LG Electronics.Inc. All right reserved.
Only for training and service purposes.

ADJUSTMENT INSTRUCTIONS

B
4. 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
flowchart.
CPT Assembling
Assembling DY to
CPT
HEAT RUN
Degaussing
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.
4.1. Color purity adjustment
(1) It makes CPT or CABINET enough to demagnetization.
(2) Receive the signal of red raster.
(3) Unfasten DY and push DY to FUNNEL direction.
(4) Make R-Land be centered as cross Purity Magnet. That
time, 4 & 6 pole magnet should keep free gauss status.
(5) Make uniform RED Raster as moving DY,Check there is
purity problem or not on R/G/B,white Raster. Then fix screw
of DY.
(At this time, be careful about inclination and DY should be
fixed keeping horizontality.)
(6) Check the TV set in direction of EAST, WEST, SOUTH,
NORTH. Adjust with supporing MAGNET when adjustment
is not operated.
4.2. Convergence adjustment
These adjustments should be operaed at the best condition of
focus after finished purity adjustment.
(1) Receive the signal of cross hatch that BACK RASTER is
black.
(2) Adjust brightness so that there are 9 ~12 dots.
- 8 -
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
6Pole
15 ~ 20mm
Let the screen Standard condition.
Operate Heat-Run at least 15
minutes.
Torque is to be 9-11 kg f.cm when
fixing DY.
LGE Internal Use Only
4
2