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Troubleshooting for LED Blinking ( 1 time blink ) for A+P type -1
LED blinks
1
BL_SOS (LED driver)
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 IC8000
Ex. 49/55EX600** series
SRV-VLED
D7403
Q7402/04
C7422
T7301
64V(*)
D7406/07
Q7403/05
C7424
16V
P
( TNPA6376** )
Detail error
LED blink 1 time.
L7816
Q7801
L7815
Q7804
LED
Drive
IC7800
Vcc
SRV-16V
Q7414
SUB-ON
Board may defect
(*)VLED : The DC level is different by the LCD panel.
1
124-110V(*)
Anode1
SRV-VLED1
SRV-VLED2
Anode2
124-132V(*)
5
Cathode1
3
Q7802
Cathode2
7
Q7803
P3
P2
A02
15
15
13
13
BL-ON
14
14
PWM
16V
1 - 4
1 - 4
9
9
<A+P>
Panel / P
LCD Module
Back
LCD Panel
light
T-CON
board
A
(Low=Normal)
BL_SOS
IC8000
BL-ON
PWM
PEAKS
47
SUB-ON
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