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CN1-4. The lamp dimmer cir cuit var ies the voltage at
CN1-4 over the range of 0 to +3.0VDC. 0VDC pro duc es
maximum (100%) bright ness; +3.0VDC pro duc es mini-
mum (0%) bright ness. Voltages between these values
produce a linear bright ness 0 and 100%. Connector
CN2 applies the high volt age lamp il lu mi na tion signal
to the lamp.
SHARP model LQ10D421 displays require a XENTEK
LS520 Backlight Inverter Board (YORK P/N XXX-
XXXXX-XXX) (refer to Fig. 30). These boards gen er ate
the lamp illumination high voltage AC from +12VDC.
When the "Backlight Enable" signal at con nec tor
CN1-5 is 0VDC, the high voltage signal is ap plied to
the lamp, turning it on. When CN1-5 is +12VDC, the
high voltage signal is re moved from the lamp, turning
it off. The lamp bright ness is controlled by a variable
voltage sig nal, de vel oped by the lamp dim mer circuit
(ref. Fig.10) on the Microboard and ap plied to connec-
tor CN1-6 and CN1-7. The Microboard plac es CN1-7
at ground (GND) po ten tial. The lamp dim mer varies the
voltage at CN1-6 over the range of 0 to +2.5VDC. 0VDC
pro duc es max i mum (100%) lamp bright ness; 2.5VDC
pro duc es min i mum (0%) bright ness. Volt ag es between
RETURN
500 - 1400 VAC
3
2
1
CN2
INVERTER
BOARD
CN1
1
2
3
4
5
N.C.
INVERTER CABLE 031-01770-003
FIG. 29 – DISPLAY BACKLIGHT INVERTER BOARD (SHARP LQ10D367 & LG SEMICON LP104V2-W)
YORK INTERNATIONAL
BACKLIGHT
LAMP
NOTES:
1. OFF = 0VDC; ON = +5VDC. Refer to
Microboard Program Jumpers JP3 & JP4.
2. 0 - +3.0VDC. 0VDC = MAX (100%) Bright-
ness; +3.0VDC = MIN (0%) Brightness.
Refer to Fig. 10 and Microboard Jumpers
JP7 & JP8.
3. Refer to Microboard Program Jumper JP5.
4. N.C. = No Connection.
BRIGHTNESS CONTROL (NOTE 2)
BACKLIGHT ENABLE (NOTE 1)
GND
+ 12 VDC (NOTE 3)
these val ues produce a linear brightness between 0 and
100%. This display has a lamp at the top of the display
and one at the bottom of the display. Connector CN2
ap plies the high voltage lamp il lu mi na tion signal to the
lower lamp; CN3 the upper lamp.
NEC model NL6448AC33-24 displays require an NEC
104PWBR1 Backlight Inverter Board (YORK P/N XXX-
XXXXX-XXX) (refer to Fig. 31). These boards gen er ate
the lamp illumination high voltage AC from +12VDC.
When the Backlight Enable signal at con nec tor CN3-1
is +5VDC, the high voltage signal is ap plied to the lamp,
turn ing it on. When CN3-1 is 0VDC, the high voltage
signal is re moved from the lamp, turn ing it off. The
lamp bright ness is controlled by a vari able re sis tance,
de vel oped by the lamp dimmer circuit (ref. Fig. 10) on
the Microboard and applied to con nec tor CN3-2 and
CN3-3. The lamp dim mer varies the re sis tance be tween
CN3-2 and CN3-3 over the range of 0 to 10K Ohms. 0
Ohms pro duc es minimum (0%) bright ness; 10K Ohms
pro duc es maximum (100%) bright ness. Re sis tanc es be-
tween these extremes pro duce lin ear bright ness be tween
0% and 100%. Con nec tor CN2 applies the high volt age
lamp il lu mi na tion signal.
DISPLAY BACKLIGHT INVERTER BOARD
TYPE: TDK CXA-L0612-VJL
PART NUMBER: 031-01789-000
FOR: SHARP LQ10D367 &
LG SEMICON LP104V2-W DISPLAYS
J6
N.C.
10
N.C.
9
N.C.
8
7
N.C.
6
5
4
N.C.
3
N.C.
2
1
FORM 160.54-M1(503)
MICRO
BOARD
LD05528
7
57
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