Hitachi service manual Waveform of LCD White Balance Adjustment

Adjustment > Adjustment Procedure

(5) LCD White Balance	LCD ADJUSTMENT MENU screen
	MANUAL ADJUSTMENT PROGRAM for SERVICE STATION

Preparations:

1)	Connect the oscilloscope CH1 to “LCD-R (pin 3)” of	LCD ADJUSTMENT MENU
	Skylark Connection jig.	LCD ADJUSTMENT MENU
2)	Connect the oscilloscope CH2 to “LCD-G (pin 5)” of	PLL
	Skylark Connection jig.	CONTRAST
3)	Connect the oscilloscope EXT TRIG to video output.
4) Switch the oscilloscope V-MODE to “ALT” and		BRIGHT
5)	TRIGGER SOURCE to “EXT”.
	Set the switches and knobs on oscilloscope so that the	WHITE BALANCE		1
	CH1 and CH2 waveforms appear as shown in Fig. 6-4-
	11.	2	EXECUTE	RETURN
	Procedure

1) Choose WHITE BALANCE on the LCD ADJUSTMENT
		CONNECTION
MENU screen.	SUB CONTRAST RED ADJUSTMENT
2) Click the EXECUTE button on LCD ADJUSTMENT	screen.
MENU screen to proceed with the SUB CONTRAST		MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
RED ADJUSTMENT screen.		SUB CONTRAST RED ADJUSTMENT
3) Click the UP and DOWN buttons so that level a of CH1
waveform is equal to level b of CH2 waveform. Click the
button at approx. 2-second intervals while checking any

increase or decrease in level a.
4) After step 3) is complete, be sure to click the NEXT		UP	DOWN
button, and then proceed with the SUB BRIGHT RED			3
ADJUSTMENT screen.
Note that clicking the RETURN button will restore the
LCD ADJUSTMENT MENU screen to the status before	4	NEXT	RETURN
the adjustment was performed.
5) Use the same procedure as in step 3) to equalize levels c	CONNECTION
and d of the waveform.
	SUB BRIGHT RED ADJUSTMENT screen.
6) After step 5) is complete, be sure to click the NEXT
	MANUAL ADJUSTMENT PROGRAM for SERVICE STATION
button, and then proceed with the SUB CONTRAST
BLUE ADJUSTMENT screen.	SUB BRIGHT RED ADJUSTMENT

c	a			DOWN
			UP
				5
d	b	6	NEXT	RETURN

Fig. 6-4-11 Waveform of LCD White Balance Adjustment CONNECTION

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