Samsung PL50P5HX/STR, Service Manual

Page: 25 / 120

Circuit Description
Samsung Electronics 13-1
13. Circuit Description
13-1 Power ON/OFF Signal Timing Sequence
D N O Y A L P S I D
N O S V N O S V N O S V N O S V
N O P A
N O R E W O P C A
F
F F O
F F O / N O R E W O P C A
) w o L e v i t c A ( N O S P
l a n r e t x E S P m o r f
) F F O / N O r e l l o r t n o c e t o m e R (
) s t u p t u o n o i t p O P O P (
, y B d n a t S
t u p t u o C F P
S T U P T U O C D
t V , p m a V , V 2 1 , V 5 . 6 A , V 3 . 5 D
) h g i h e v i t c A ( N O S V
l a n r e t x E S / P m o r f
T U P T U O C D
s V
F F O / N O Y A L P S I D
V 5 V 5
V 4 . 3
V 4 . 3
f f o - n r u t p e t s y b d n a t S
r o f µ µ t e s e r r o s s e c o r p -
S m 0 7
. c e S m 0 7
O o t t N O r e ll o r t n o C e t o m e R o t t N O e ll o r t n o C e t o m e R
S T U P T U O
g V
P I N O Y A L P S I D
S T U P T U O C D
a V
a c V
s c V
1. When connecting the AC power cord, Stand-By 5V from the Main SMPS is supplied to the Main Board (Pin 3 of CN1002 of Main
Board).
2. When pressing the Power button on the remote control or on the main body, PS_ON (Pin 5 of CN1002 of Main Board)
changes from High to Low.
3. If the PS_ON signal changes to Low, the Main SMPS supplies power to the Main Board and Logic Board, and Va and Vg power
is supplied to the DC-DC SMPS.
4. If the VS_ON signal from the Logic Board changes from Low to High, the Main SMPS supplies VS power to the X and Y Drive
Board through the DC-DC SMPS, and the screen displays a picture on it.