Power On/Off Sequence - Samsung LTN173KT02-T01 Service Manual

6.3 Power ON/OFF Sequence

: To prevent a latch-up or DC operation of the LCD module, the power on/off sequence
should be as the diagram below.
LED Power (V
B/L Enable
Timing (ms)
0.5＜T ≤10
1
0＜T ≤50
2
0＜T ≤50
3
500 ≤T
4
200 ≤T
5
200 ≤T
6
0＜T ≤10
7
10＜T
8
10＜T
9
0.5＜T ≤10
10
0.5＜T ≤10
11
10＜T
12
10＜T
13
10＜T
14
10＜T
15
Samsung Secret
Doc.No. LTN173KT02-T01
Power ON/OFF Sequence
0.9 V
DD
Power Supply VDD
0.1 V
DD
0V
T
1
T
2
0 V
0.9 LED V
in
0.1 LED V
)
in
in
T
8
PWM
T
V rising time from 10% to 90%
DD
Delay from V
DD
Delay from valid data OFF to V
V OFF time for Windows restart
DD
Delay from valid data to B/L enable at power ON
Delay from valid data off to B/L disable at power Off
V falling time from 90% to 10%
DD
Delay from valid data on to LED driver Vin rising time 10%
Delay from LED driver Vin falling time 10% to valid data Off
LED V rising time from 10% to 90%
in
LED V falling time from 90% to 10%
in
Delay from LED driver Vin rising time 90% to PWM ON
Delay from PWM Off to LED driver Vin falling time 10%
Delay from PWM ON to B/L Enable ON
Delay from B/L Enable Off to PWM Off
Timing Parameters and definition
Rev.No
Signals
VALID
T T
10 11
T T
12 13
T
14
15
T
T
6
5
Remarks
to valid data at power ON
OFF at power Off
DD
04-A01-G-120208
Approval
0.9 V
DD
0.1 V
DD
T
T
4
7
T
3
0.9 LED V
in
0.1 LED V
in
T
9
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