LG 42PT250B Service Manual page 38

No OSD Trouble Shooting (Module Power Sequence)
Vcc
(5V)
Va
Vs
DISPEN
Symbol
T
On
T
Off
T
OnR
T
VaR
T
VaF
T
VsR
T
VsF
T
d_on
T
d_off
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Only for training and service purposes
T
On
T
VaR
T
VsR
T
d_on
Normal Display
Description
Time interval between 90% of Vcc and 10% of Vs
when Power On
Time interval between 10% of Vs and 90% of Vcc
when Power Off
Time interval between 10% of Vcc and 90% of Vcc
when Power On
Rising Time of Va (10% to 90%)
Falling Time of Va (90% to 10%)
Rising Time of Vs (10% to 90%)
Falling Time of Vs (90% to 10%)
Time interval between 90% of Vs
and DISPEN rising edge when Power On
Time interval between DISPEN falling edge
and 90% of Vs when Power Off
T T
Off OnR
T
VaF
T
VsF
T
d_off
Min. Max.
750 1250
20 -
2000 -
10 300
50 500
100 400
90 500
3100 -
1500 6000
Recommended 2sec
unit
msec
msec
msec
msec
msec
msec
msec
msec
msec
LGE Internal Use Only