LG HX300G Service Manual page 6

(3) Red Bar Control
1) After converting to Black screen, check the Red Bar at
the right bottom rotating the Focus Ring to the end of
right and left.
2) If Red Bar appears, rotate the "H direction Screw" to
adjust the Red bar Just on screen.
3) Complete it after checking the right and left light margin
condition on White screen.
<Fig. 4-4> Red Bar Control
(4) Checking illumination meter control condition
1) Convert the screen to White one to re-check the final
light condition.
2) When checking illumination meter control condition, fix it
not to cause light being twisted with Glue and
illumination meter control screw(refer to how to do
illumination meter fixation), after alien substance check
and Focus width test (testing subject: Focus test method
and subject) on each screen.
<Fig. 4-5> Checking illumination meter control condition
(5) Method of illumination meter fixation
1) After completing illumination meter control, to keep the
initial controlled condition and the light not being twisted,
Glue(SuperX8008) on light control point and alien
substance entrance part to fix it.
2) After Glue(SuperX8008) spray work, leave it for 45 min.,
and attach the Tape for light leakage prevention.
<Fig. 4-6> Method of illumination meter fixation
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Only for training and service purposes
4-2. Focus test method and subject
- Test pattern : Resolution Pattern , White Cross-Hatch
Pattern
- Tools : Focus width measurement ruler
(1) Focus adjustment method
1) Set the projection distance of Engine as 1100 mm (40
Inch screen).
2) Pop up the Resolution Pattern among the Test Patterns
of Set, and fix the Focus on the part where the
Resolution Pattern is classified on each part of screen.
(all parts Balancing)
3) Popup the White Cross-Hatch Pattern and measure the
width of each Point.
4) Focus judging standard : it follows product specification
(Fig. 4-7) ResolutionPattern (Left)
(Fig. 4-8) White Cross_Hatch Pattern (Right)
5. Caution for DMD
(Digital Micro-mirror Device)
5-1. Caution for DMD ESD
(1) Connector the grounding to prevent a damage of ESD
(Electrostatic Discharge) when handing the DMD.
(2) Wear a wrist strap to connect the ESD grounding in flesh
necessarily.
(3) Connect the ESD ground to workstation and an electric
conductor.
(4) Save the DMD after getting rid of a static electricity. Keep
it at an exclusive case when moving it When grounding,
open the case.
(5) Put on gloves for preventing static electricity.
(6) All work is done at static free location. Attach the tape or
remove a dust on the DMD front or DMD back pin
5-2. Caution for DMD Clean
(1) Follow the procedure and caution to prevent the screen
from being scratched.
(2) When DMD glass stains with dust, polish the front and
back DMD glass with soft cloth. Then, do it again after
rotating 180 degree the DMD. If necessary, keep under
observation.
(3) Don't clean the DMD with the high pressure. The static
electricity and pressure will damage the DMD.
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