Panasonic LCD-201803, Technical Manual

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P
LDP
( TNPA6374** )
T7301
16V
64V(*)
Q7402/04
Q7414
LDP6
16V
P2
SUB-ON
Q7403/05
L7813
Anode2
Cathode2
Vcc
SRV-16V
SRV-64V
SRV-VLED2
Q7801
D7412/16
C7424
D7403/06
C7422/23
L7814
Anode1
SRV-VLED1
Q7804
Cathode1
1
1
3
3
P2
19,
20
A
A02
IC8000
SoC
LCD Module
T-CON
board
LCD Panel
1 - 4
13
14
15
9
BL_SOS
SUB-ON
( TNPA6375** )
Tr
(Low=Normal)
LDP3
5,
6
Back
light
9
LED blinks Detail error Board may defect
1 BL_SOS (LED driver) Panel / LDP / 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 IC800
LED blink 1 time.
LED
Drive
IC7800
Q7802
Q7803
BL-ON
PWM
Ex. 65FX600* series
VLED1(*)
VLED2(*)
(*)VLED : The DC level is different by the LCD panel.
50
LDP5
LDP2
4 3 2
1 - 4
13 1
Troubleshooting for LED Blinking ( 1 time blink ) for A+P+LDP type -1
<A+P+LDP>
SRV-64V