Sony XR-55A95K Service Manual page 20

TROUBLESHOOTING
1.2 No Power U – com Failure
BM5S22 Board OLED Model when Mounted on IC401
3.3V_STBY
TCON_24_ON
TCON_12_ON
Power Board
12.7V_MAIN R450
12.7V_AUDIO R444
Q400
3.3V_STBY
Tr SW
SOC (IC5000)
※ FD:R444 No Mount
GND
Main Board
VDD
#pin6
BL_ON
IC413
#pin7
POWER_ON
#pin10
12V_MON
#pin16
ADC port
GND
TYPE_DET
#pin17
CAMERA_PWR_ON
#pin8
DC_MON
#pin11
ADC port
GND
GND
PGOOD_1
#pin9
P_ON_#1
DDCs : 0.9V_BE_DDC_1 (IC4802), 0.9V_BE_DDC_2 (IC4803),
#pin12
DDCs : 5V_MAIN&5.0V_VBUS&5V_AUDIO (IC600 or IC610),
P_ON_#2
#pin13
LDOs : 3.3V_MAIN_H (IC403)
FET SW : 3.3V_TU_P (Q602/Q603)
P_ON_HL
#pin18
OPWRSB
#pin2
ORESETB
#pin14
DC_OFF_DET
#pin3
X_BL_MUTE
#pin8
P-on u-com control signal path summary
DDC : 0.8V_M5_CORE (IC804)
0.8V_BE (IC4809), 0.7V_BE (IC4810)
1.0V_TU_P (IC603),
1.8V_M5 (IC807), 1.0V_M5 (IC808),
0.8V_M5_CPU (IC810), 0.8V_M5_GPU (IC811)
1.8V_BE_DDC (IC4800)
5.0V_VBUS_CAMERA(IC611)※Internal camera model only
FET SW : 12.7V_LNB (Q604/Q605)
SW IC : 3.3V_TU_P (Q609 – IC604)
USB VBUS SW (IC3801-IC3806)
SOC Muffin 5 (IC1000)
20
SYS SET