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Troubleshooting for LED Blinking ( 1 time blink )
LED blinks
1
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
Ex. 43/49DS630** series
SRV-VLED
D7401/02
Q7402/05
C7422
T7301
24V/
32V(*)
D7408/09
C7423
16V
P
( TNPA5916** )
Detail error
BL_SOS (LED driver)
Q7804
8,9
8,9
Q7801
P4
LD1
LD
( TNPA5935** )
Q7403
SRV-16V
Q7401
(*)VLED : The DC level is different by the LCD panel.
LED blink 1 time.
L7814
58V(*)
SRV-VLED1
SRV-VLED2
L7813
88V(*)
Q7802
LED
Drive
IC7800
Vcc
BL-ON
PWM
16V
SUB-ON
<A+P+LD/LDP> -1
Board may defect
Panel / LD / P
3
LCD Module
Anode1
Back
light
Anode2
7
Cathode1
1
Cathode2
5
Q7803
LD2
A02
P2
(Low=Normal)
BL_SOS
14
8
11
12
BL-ON
13
10
PWM
1 - 3
1,3,5
2
9
SUB-ON
LCD Panel
T-CON
board
A
IC8000
PEAKS
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