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Troubleshooting for LED Blinking ( 1 time blink )
LED Drive Circuit in LD Board
-1
LD
AP
IC7550
DCDC
VCC
STB
AP1
Q7550
L7600
48/40V
16V
48
(TNPA5941**)
IC7552
DCDC
VCC
Q7556
L7601
48/40V
IC7554
DCDC
VCC
STB
Q7562
L7602
48/40V
IC7556
DCDC
VCC
STB
Q7568
L7603
48/40V
VLED1
(56/68V)
AP3
1-6
13
STB
BL_ON (High=ON)
(LED Backlight)
LCD Panel
Module
IC7700-7708
LED Drive
L
O
G
I
C
G1
G2
G9
Current
check
Current
check
G16
8 Drive ICs
PWM1
PWM2
PWM3
PWM4
LD1
LD2
PWM1/2/3/4
4
2
1
3
1 Drive-IC output 16
drive signals.
8Drive-IC x 16 = 128
128 block backlight
LED1-K1
LED1-K8
LED1-K9
LED1-L16
LD4
(TNPA5938**)
STB
12
P
P3
1-6
13
4
2
1
3
9
9
3
48/40V
16V
BL_SOS (Low=Normal)
A
FR
FR30/31
BL_ON
FR15
12
IC9500
GCX2
IC1100
Stand-by/
Control
CPU
BL_ON_INPUT
A16
48
4
( 1 Blink )
7
45
2
2
12
TV_SUB_ON
AX900
(TNPA5936**)
< 4. LED drive circuit
in LD board
>
(AX900)
5
16 connectors
LD5-20
PA7500
Tr
VLED2
(56/68V)
VLED3
(56/68V)
VLED4
(56/68V)
5V
(Data/CLK/Sync)
SRV-VLED1
SRV-VLED2
SRV-VLED3
SRV-VLED4
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