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Troubleshooting for LED Blinking ( 1 time blink ) for A+P+LDP type -1
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 IC800
Ex. 65EX600 series
SRV-64V
D7403/06
Q7402/04
C7422/23
T7301
64V(*)
D7412/16
Q7403/05
C7424
16V
P
( TNPA6374** )
Detail error
BL_SOS (LED driver)
SRV-64V
Q7804
LDP3
L7813
19,
5,
20
6
Q7801
P2
13
1
LDP
( TNPA6375** )
SRV-16V
Q7414
SUB-ON
(*)VLED : The DC level is different by the LCD panel.
LED blink 1 time.
L7814
VLED1(*)
Anode1
SRV-VLED1
SRV-VLED2
Cathode1
Anode2
VLED2(*)
Q7802
LED
Cathode2
Drive
IC7800
Q7803
Vcc
2
3
4
LDP2
P2
1 - 4
16V
9
<A+P+LDP>
Board may defect
Panel / LDP / P
1
LCD Module
LDP5
3
Back
LCD Panel
light
1
LDP6
3
A02
(Low=Normal)
BL_SOS
15
14
BL-ON
13
PWM
1 - 4
9
SUB-ON
T-CON
board
A
IC8000
PEAKS
50
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