P
LD
( TNPA5916** )
T7301
16V
24V/
32V(*)
Q7402/05
Q7401
LD2
16V
P2
SUB-ON
Q7403
BL-ON
L7813
Anode2
Cathode2
Vcc
SRV-16V
SRV-VLED
SRV-VLED2
Q7801
PWM
D7408/09
C7423
D7401/02
C7422
L7814
Anode1
SRV-VLED1
Q7804
Cathode1
3
7
1
5
P4
8,9
A
A02
IC8000
PEAKS
11
13
14
LCD Module
T-CON
board
LCD Panel
1 - 3
1,3,5
10
12
8
2
BL_SOS
SUB-ON
( TNPA5935** )
Tr
(Low=Normal)
LD1
8,9
Back
light
9
LED blinks
Detail error
Board may defect
1
BL_SOS (LED driver)
Panel / LD / P
Troubleshooting for LED Blinking ( 1 time blink )
If the IC7800 detects
1.abnormal current of backlight LEDs ( = Backlight LED broken or Low(No) VLED voltage )
2.abnormal DC/DC power supply of IC7800 (does not rise up the VLED voltage )
or the IC7800 does not work (No Vcc or No BL_ON/PWM signal or defect itself),
the IC7800 output BL_SOS signal to IC8001
LED blink 1 time.
LED
Drive
IC7800
Q7802
Q7803
BL-ON
PWM
Ex. 43/49DS630** series
58V(*)
88V(*)
(*)VLED : The DC level is different by the LCD panel.
<A+P+LD/LDP> -1
