HP W1907 Service Manual

Is +20V supplied to inverter PWB ? (by the
power board)
4.3 Checking the back light unit
OK
NG
Failure Point
1) Inverter cable disconnection.
2) Power board failure.
Check the BACKLIGHT_EN signal of the
P301 pin 2 at high level.
OK
NG
Failure Point
1) printed wire broke between P301 pin 2,
R305 and I306 pin 49.
2) R305 is open, or R306, C308 are short.
3) I306 is failure.
Check the BACKLIGHT_ADJ signal of the
P302 pin 3 from I306 pin 50 is a PWM
signal.
OK
NG
Failure Point
1) printed wire broke between P301 pin 3,
Q301 and I306 pin 50.
2) Q301 is failure.
3) R301 or R302 or R304 is open, or C304
is short.
4) I306 is failure.
Failure Point
Back light unit of LCD module is failure.
Page 14
022-83718162
www.chinadse.org
022-83715667

HP W1907 Specifications

General

Pixel pitch	0.285 x 0.285 mm
Display diagonal	19 \
Display resolution	1440 x 900 pixels
Viewable size diagonal	483 mm
Contrast ratio (typical)	1000:1
Digital vertical frequency	55 - 75 Hz
Digital horizontal frequency	30 - 83 kHz
Power requirements	100-240VAC
HDCP	Yes
Certification	FCC Class B
Product color	Silver
Country of origin	China
Market positioning	-
Panel mounting interface	100 x 100 mm
Power consumption (standby)	2 W
Power consumption (typical)	49 W
Storage temperature (T-T)	-20 - 60 °C
Operating temperature (T-T)	0 - 40 °C
Operating relative humidity (H-H)	15 - 90 %
Sustainability certificates	ENERGY STAR

Weight and Dimensions

Depth (without stand)	182 mm
Width (without stand)	452 mm
Height (without stand)	378 mm
Weight (without stand)	5000 g