Acer H243H service manual Brightness output, White balance, Brightness uniformity

Acer Acer –LCD-H243H

≥75%

(DC output full loading and nominal AC input voltage range)

Ripple and Noise

Total composite ripple and noise less than 800mV for +25V output, and less than 150mV for +5V output, and 50mV for +3.3V output tested by DC loading side parallel with a 47uF/EC and 0.1uF/Ceramic. Capacitors and measured band-width with DC-20MHz

DC Output Voltage and Current

3.1 Brightness output

The test to verify specifications in this section shall be performed under the following standard conditions unless otherwise noted.

Temperature	: 25 ± 5°C
Test pattern	: white
Video Resolution	: 1920 x 1080
Video input level	: 700 mV ± 2%
Warm-up time	: 30 minutes

Set brightness control and also contrast control at maximum, to measure the screen center, the light output shall BL ≥ 240 cd/m2 (as panel spec).

3.2 White balance

The test standard conditions refer to Sec 3.1.( Brightness and contrast are under default value )

Mode		Chromaticity Coordinate
		x		y
Cool	9300K		0.283 ± 0.030		0.297 ± 0.030
Warm	6500K		0.313 ± 0.030		0.329 ± 0.030
User			Panel While x		Panel While y

3.3Brightness uniformity

The test standard conditions refer to Sec 3.1.

Min. luminance of nine points (backlight)		≥75%
Max. luminance of nine points (backlight)
	L/2		L/10
4	5	6	W/10
1	2	3
7	8	9
			W/2
			5