Hitachi service manual LCD Brightness, Waveform of LCD Bright Adjustment

Adjustment > Adjustment Procedure

(3) LCD Brightness

Note:

1)Be sure to adjust LCD contrast-1 before performing LCD brightness adjustment.

2)Be sure to adjust LCD contrast-2 after completing LCD brightness adjustment.

Preparations:

1)Connect the oscilloscope CH2 to “LCD-G (pin 5)” of Skylark Connection jig.

2)Switch the oscilloscope V-MODE to “CH2”: Leave the TRRIGER SOURCE in “CH1” as is.

Procedure:

1)Choose BRIGHT on the LCD ADJUSTMENT MENU screen.

2)Click the EXECUTE button on LCD ADJUSTMENT MENU screen to proceed with the BRIGHT ADJUSTMENT screen.

3)Click the UP or DOWN button so that the value of level B of waveform is 2.35V ± 0.1Vp-p. Click the button at approx. 2-second intervals while checking any increase or decrease in level B.

4)After step 3) is complete, be sure to click the SAVE button.

Note that clicking the RETURN button will restore the LCD ADJUSTMENT MENU screen to the status before the adjustment was performed.

5)When save is complete, the ADJUSTMENT FINISHED dialog will appear: Click the OK button in dialog to restore the LCD ADJUSTMENT MENU screen.

LCD ADJUSTMENT MENU screen

MANUAL ADJUSTMENT PROGRAM for SERVICE STATION

LCD ADJUSTMENT MENU

LCD ADJUSTMENT MENU

PLL

CONTRAST

BRIGHT 1

WHITE BALANCE

2 EXECUTE RETURN

CONNECTION

BRIGHT ADJUSTMENT screen

MANUAL ADJUSTMENT PROGRAM for SERVICE STATION

BLIGHT ADJUSTMENT

UP DOWN

3

4 SAVE RETURN

CONNECTION

ADJUSTMENT FINISHED dialog

FINISHED

ADJUSTMENT FINISHED.

OK

5

B = 2.35V ± 0.1Vp-p

Fig. 6-4-9 Waveform of LCD Bright Adjustment

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