Pwb Adjustment; Initial Writing In Eeprom Data; General Adjustment And Inspection; Preparation - NEC LCD1550X Service Manual

2.5.3 PWB adjustment

2.5.3.1 Initial writing in EEPROM data

To initialize the preset timing, write the default data of preset timing listed in 2.11 Timing chart with an external
source by communication.
Model name
Confirm that the model name shown on the OSM picture in factory mode is LCD1550X.

2.6 General adjustment and inspection

2.6.1 Preparation

Note1) Rough adjustment should be implemented with 100VAC/60Hz, and aging (heat-running) should be
implemented with 240VAC/50Hz.
Note2) When DVI-D is used for input, unless particularly designated, only Timing No. 14 (60kHz/75Hz, XGA75)
should be used for inspection.
Unless particularly designated, adjustment should be carried out with DVI-A input in factory mode and the
setting state should be as follows. (To enter factory mode, refer to 2.4.2 OSM operation method.)
BRIGHTNESS: MAX (220)
CONTRAST: CENTER (128)
SHARPNESS: CENTER (64)
AccuColor: NATIVE or sRGB
COLOR CONTROL: All of R, Y, G, C, B, M and S should be 0 (CENTER)
Before aging, signal is input for confirmation of each operation switch operation.
Moreover, unless particularly designated, Timing No. 14 should be used for adjustment.

2.6.1.1 Confirming operation of operation SW and functions

(1) Input the confirmation timing with the signal generator, and set the pattern to OP2.
(2) Confirm that the picture appears within 4 seconds after turning the vacation switch and the power switch ON.
(3) Confirm that Power-On Indicator is lit in green.
(4) Press ( ) button to display the OSM picture.
(5) Select OSM POSITION with OSM, and press (+) / (-) button to confirm that OSM picture moves.
(6) After pressing RESET button, press NEXT button to confirm that the OSM picture returns to the appointed
position.
(7) Press EXIT button, and confirm that OSM picture disappears.

2.6.1.2 Inspection of picture

(1) Check the picture position and the inclination according to 2.5.2 Mechanism and appearance inspection.
(2) Check the picture defect according to 2-9 Liquid crystal display defect standards.
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