Panasonic LCD-201803, Technical Manual, Page: 47 / 61

P
T7301
16V
64V(*)
Q7402/04
Q7414
P3
16V
P2
SUB-ON
Q7403/05
BL-ON
L7815
Anode2
Cathode2
Vcc
SRV-16V
SRV-VLED
SRV-VLED2
Q7804
PWM
L7816
Anode1
SRV-VLED1
Q7801
Cathode1
1
5
3
7
A
A02
IC8000
SoC
13
14
15
LCD Module
T-CON
board
LCD Panel
1 - 4 1 - 4
BL_SOS
SUB-ON
( TNPA6376** )
Tr
(Low=Normal)
Back
light
9
LED
Drive
IC7800
Q7802
Q7803
BL-ON
PWM
124-110V(*)
124-132V(*)
47
D7403
C7422
D7406/07
C7424
13
14
15
9
LED blinks Detail error Board may defect
1 BL_SOS (LED driver) Panel / P
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
LED blink 1 time.
(*)VLED : The DC level is different by the LCD panel.
Ex. 55FX600** series
Troubleshooting for LED Blinking ( 1 time blink ) for A+P type -1
<A+P>
64V(*)