Sony KD-43X85K Service Manual page 18

TROUBLESHOOTING
1.2 No Power u-com Failure
3.3V_STBY
Power-Board
or
LD-Board
12.7V_MAIN
R450
19.5V_12.7V_AUDIO
R444
3.3V_STBY
GND
Main Board
VDD
#pin6
#pin9
#pin12
BL_ON
#pin7
POWER_ON
#pin10
#pin13
12V_MON
#pin16
ADC port
GND
#pin18
TYPE_DET
#pin17
DC_MON
#pin14
#pin11
#pin3
ADC port
#pin8
GND
P-on u-com control signal path summary
PGOOD_1
P_ON_#1
DDCs:
5V_MAIN&5.0V_VBUS&5V_AUDIO (IC600),
1.0V_TU_P(IC603), 1.8V_M5 (IC813), 1.0V_M5 (IC812),
P_ON_#2
0.8V_M5_CPU (IC810), 0.8V_M5_GPU (IC811)
LDOs:
3.3V_MAIN_H (IC403)
FET SW :
3.3V_TU_P (Q602), 3.3V_MAIN &3.3V_AUDIO(Q611),
P_ON_HL
OPWRSB
#pin2
ORESETB
DC_OFF_DET
X_BL_MUTE
DDC : 0.8V_M5_CORE (IC804)
LDO : 1.8V_EMMC (IC2201)
FET SW : 12.7V_LNB (Q604)
SW IC : 3.3V_TU_P (Q609)
USB VBUS SW (IC3803/IC3804)
SOC Muffin 5 (IC1000)
18
SYS SET