Akai LC27HAB, Service Manual

Page: 55 / 82

3.2.2 INVERTER CHARACTERISTICS
(
Ta = 25 ± 2 ºC)
Value
Parameter Symbol
Min. Typ. Max.
Unit Note
Power Consumption P
BL
- 92 - W (5), I
L
= 4.7mA
Power Supply Voltage V
BL
22.8 24 25.2
V
DC
Power Supply Current I
BL
-
3.8
-
A Non Dimming
Input Ripple Noise -
- -
500 mV
P-P
V
BL
=22.8V
1790 - - V
RMS
Ta = 0 ºC Backlight Turn on
Voltage
V
BS
1200 - - V
RMS
Ta = 25 ºC
Oscillating Frequency F
W
53 56 59 kHz
Dimming Frequency F
B
150 160 170 Hz
Minimum Duty Ratio D
MIN
- 10 - %
Note (1) Lamp current is measured by utilizing high frequency current meters as shown below:
LV (Gray)
A
A
A
A
A
A
A
A
A
A
A
A
A
A
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
2
HV (Pink)
HV (White)
1
Inverter
LCD
Module
Note (2) The lamp starting voltage V
S
should be applied to the lamp for more than 1 second under starting
up duration. Otherwise the lamp could not be lighted on completed.
Note (3) The lamp frequency may produce interference with horizontal synchronous frequency from the
display, and this may cause line flow on the display. In order to avoid interference, the lamp
frequency should be detached from the horizontal synchronous frequency and its harmonics as far
as possible.
9