Sony KD-43X7 F Series Service Manual page 16

3.1 No power - LD board
12V DDCON check
START
no
Check fuse F1000
Is < 1ohm
yes
no
Check Input to GND
Is > 1k ohm?
yes
Check Input to Output no
Is > 1k ohm?
yes
no
Check Output to GND
Is > 1k ohm?
yes
Check 12V
C1016 voltage
≥ 12V
Is voltage <12V?
yes
Check EN POWER_ON
no
R1003 voltage
Is voltage >2.5V?
yes
Check Vcc
no
C1009 voltage
Is voltage >5.0V?
yes
Fuse F1000 broken
DDC IC1000 broken
DDC IC1000 broken
DDC IC1000 broken
Check B-Board
Troubleshooting flow 1.2
IC1000 broken
12V_TCON check
yes
Check 12.5V_TCON
Is voltage > 12.0V?
no
Check TCON_ON
C1024
Is voltage > 3.0V?
yes
Check MOSFET
Q1006
Is > 1kohm?
yes
12V power OK
Check other troubleshooting flow
END
Check point on PWB refer next slide
no
Main device failure
no
Q1006 broken
16
SYS SET