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Disconnect AP1 connecter.
Check if voltage 68/56V at
Test pin (SRV-VLED1-4)
In AP board before shutdown
Yes
68/56V
68/56V
NG
Replace P board
Replace LD board
49
Power off. Short check between pins of
LD5-20 and GND. The pins are
LD5,8,10,12,14,16,18,20=pin1-6,10,11
LD6,7,9,11,13,15,17,19=pin1,2,6-11
All OK
There is NG
BL_SOS is generated by one of the LED backlight drive IC
in LD board
and sent to IC1100 of A
board via connector LD4 at pin 12, FR15 at pin 7 when detecting malfunction of LED driver.
- Normal : BL_ON is high (3.3V) , BL_SOS is low (0V)
Disconnect P3 connecter.
Check if voltage 48/40V at
Test pin (SRV-P40_48V)
In P board before shutdown
Yes
48/40V
48/40V
NG
Replace Panel Module
Disconnect FR30/31 connecter.
Check if voltage 3.3V at Pin 12
of FR30/31(BL_ON) before
shutdown
Yes
3.3V
3.3V
NG
Replace AP board
Replace FR(A) board
5V
IC7700 - IC7707
LED blinks
Detail error
Board may defect
1
LED driver: BL_SOS
LD/AP/P/Panel
< 4. LED drive circuit
in LD board
>
(AX900)
5
Troubleshooting for LED Blinking ( 1 time blink )
LED Drive Circuit in LD Board
-2
AX900
Reconnect AP1 connecter.
Check if voltage 5V at the
capacitor for 49pin (VREF5V
output) of IC7700 – 7707.
*refer to the right drawing
(just before shutdown)
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