Akai LCT2765TD, Service Manual

Page: 89 / 105

Preliminary
6.2 POWER ON/OFF SEQUENCE
To prevent a latch-up or DC operation of LCD module, the power on/off sequence should be as the
diagram below.
0
≦
T
1 ≦
10ms
0
≦
T
2
≦
50ms
0
≦
T
3
≦
50ms
500ms
≦
T
4
50%
0V
0V
50%
T
6
T
5
T
3
T
1
0.1Vcc
0.9 V
CC
0.1V
CC
0.9 V
CC
T
4
T
2
VALID
Power On
Power Supply
V
CC
Signals
Power Off
Backlight (Recommended)
500ms
≦
T
5
100ms
≦
T
6
Power ON/OFF Sequence
Note (1) The supply voltage of the external system for the module input should follow the definition of Vcc.
Note (2) Apply the lamp voltage within the LCD operation range. When the backlight turns on before the LCD
operation or the LCD turns off before the backlight turns off, the display may momentarily become
abnormal screen.
Note (3) In case of Vcc is in off level, please keep the level of input signals on the low or high impedance.
Note (4) T4 should be measured after the module has been fully discharged between power off and on period.
Note (5) Interface signal shall not be kept at high impedance when the power is on.
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