Back-Light Unit; Functional Specification; Display Quality - BenQ Q7T3-FP737S Service Manual

Q7T3(AUO panel) LCD Monitor Service Guide

3.8 BACK-LIGHT UNIT

The backlight system is an edge-lighting type with 4 CCFLs (Cold Cathode Fluorescent Lamp).
The characters of dual lamps are shown in the following tables.
ITEM SYMBOL
Lamp Current
Lamp Voltage
Driving Frequency
LIFE Time
Startup Voltage
*1.Lamp frequency of inverter may produce interference with horizontal synchronous frequency,and this may cause horizontal
beat on the display.Therefore,please adjust lamp frequency,and keep inverter as far from module as possible or use
electronic shielding between inverter and module to avoid the interference
*2. Definition of the lamp lifetime
Luminance: L under 50% of specification
Starting Lamp Voltage: VS < 1700V, Ta=0℃

4. Functional specification

All the tests to verify specifications in this section must be performed under the following standard conditions unless
otherwise noted. The standard conditions are:
-Temperature: 5 to 40 degree Celsius
-AC line input voltage: 90 Vac to 264 Vac, 47Hz or 63Hz
-Warm-up time: 30 minutes minimum

4.1 Display Quality

4.1.1 Display Data Area (with full white pattern)
(1) Horizontal: 337.920 mm
(2) Vertical: 270.336 mm
4.1.2 Video Performance
(1) Resolution: 1280X1024 pixels Maximum
(2) Contrast ratio: 250(Min.), 450(Typ.)
(3) Response time: 16 ms (Typ.)
(4)Viewing angle : Up/Down:70 ° R/L:70 ° (At contrast ratio >= 10)
(5) CIE Coordinate: White (0.31, 0.33) +/- (0.03, 0.03) (at user mode)
(6) Display color: 18 bits color
4.1.3 Light Output
Brightness rating : 260cd/ ㎡ (Typ.) (at user mode
MIN
l 3.0
f
VL
40
-
-
-
VS < 1200V, Ta=25℃
Engineering Specification
TYP MAX
7 7.5
700
50 80
30,000 -
1700 -
1200 -
)
Ta=25 ± 2
Unit Condition
mA
Vrms IL=7.0mArms
KHz *1
*2
IL=7.0ma
Hour
Continuous
Operation
Vrms 0°C
Vrms 25 °C
± 2
14
°C