XOCECO LC20H3D, Service Manual

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breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case
before the transportation or handling.
2.12. For the storage make sure to put it in a place where the environment can be controlled so as
to prevent the temperature and humidity from exceeding the limits as specified in the manual. For
prolonged storage, it is necessary to house it in an anti-moisture bag and put them altogether in one
place. The ambient conditions are tabulated as follows:
Temperature Scope for operation 0----+50 C
Scope for storage -20----+60 C
humidity Scope for operation 20%---85%
Scope for storage 10%---90%
2.13. Display of a fixed picture for a long time may result in appearance of picture residue on the
screen, as commmonly called “ghost shadow”. The extent of the residual picture varies with the maker of
LCD screen. This phenonmenon doesn’t represent failure. This “ghost shadow” may remain in the
picture for a period of time (several minutes).But when operating it please avoid displaying still picture in
high brightness for a long time.
3.Points for attention during installation
3.1. The front panel of LCD screen is of glass. Wheng installing it please make sure to put it in place.
3.2. For service or instatallation it’s necessary to use specified screw lest it should damage the
screen.
3.3. Be sure to take anti dust measures. Any foreign substance that happens to fall down between
the screen and the glass will affect the receiving and viewing effect
3.4. When dismantling or mounting the protective partition plate that is used for anti vibration and
insulation please take care to keep it in intactness so as to avoid hidden trouble.
3.5. Be sure to protect the cabinet from damage or scratch during service, dismantling or mounting.
Instructions on adjusting and testing
1.Adjusting and calibrating equipment
Digital multi-meter (or oscilloscope)
5515 signal generator
5518 signal generator
PC set(FLASH writing programs have to be installed first.)
K7253(VGA, YprPb signal generator)
CA210 (LCD white balancer)
DVD broadcaster
2.Flow chart for the adjustment and calibrationSee fig.1.
Check if N4, N20, N303, N302 has
been FLASH written.
Produce main board, TV board on line