Panasonic LCD-2016

Troubleshooting for LED Blinking ( 1 time blink )
<A+P+LD/LDP> -1
LED blinks Detail error Board may defect
1 BL_SOS (LED driver) Panel / LD / P
If the IC7800 detects
(*)VLED : The DC level is different by the LCD panel.
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 LED blink 1 time.
Ex. 43/49DS630** series
SRV-VLED
D7401/02 Q7402/05
C7422
L7814
Q7804
L7813
3
58V(*) Anode1
SRV-VLED1
SRV-VLED2 Back
Anode2
LCD Module
LCD Panel
T7301
24V/
32V(*)
D7408/09
C7423
8,9 8,9
Q7801
P4 LD1
LD
( TNPA5935** )
Q7403
LED
Drive
IC7800
Vcc
88V(*)
7
Cathode1
1
Q7802
Cathode2
5
Q7803
LD2
light
A02 (Low=Normal)
T-CON
board
A
16V
SRV-16V
16V
BL-ON
PWM
P2
14 8
11 12
13 10
1 - 3 1,3,5
BL_SOS
BL-ON IC8000
PWM PEAKS
Q7401
P
( TNPA5916** )
9
2
SUB-ON
SUB-ON
52