Sony XR-55A95K Service Manual page 21

2023/12/21 05:31:02 (GMT+09:00)
TROUBLESHOOTING
1.2 No Power U – com Failure
BM5S22 Board OLED Model when Mounted on IC401
START
Check VDD
C442 Voltage.
Is the voltage >3.0V?
yes
Check TYPE_DET
CL408 or R451 Voltage.
Is the voltage 2.6±0.2V?
yes
Check OPWRSB
CL411 or R460 Voltage.
Is the voltage 0V?
yes
Check POWER_ON
CL419 or R470 Voltage.
Is the voltage >3.0V?
yes
no
Check 3.3V_STBY Line (C1708, CN1700 #9pin)
no
Type Detection Circuit problem.
Check TYPE_DET Line (R445, R446).
no
SOC
Muffin 5 problem
IC1000 # AP17 OPWRSB
Try AC Off and On after few minutes.
no
If #pin10 keep Low, change IC401.
If #pin10 goes High few seconds and downs to Low,
Check 12.7V_MAIN Line (from G board).
no
Check 12V_MON
R462 Voltage.
Is the voltage >2.6V?
yes
Check DC_OFF_DET no
CL414 or R465 Voltage.
Is the voltage >3.0V?
yes
Check P_ON_#1
no
CL418 or
P-on u-com #pin12 (IC401)
is >3.0V?
yes
no
Check PGOOD_1
CL413 or R456 Voltage.
Is the voltage >3.0V?
Continue next page...
Check 12.7V_MAIN Line
(from Power board)
Check 12.7V_24V_AUDIO Line
(only FD) (from Power board).
Check "AC_OFF_DET_OUT"
(CL404 or CL5221 from IC5000)
Check "AC_DET_IN"
(JL1707, R1704 or CN1700 #16pin
from Power board)
Change IC401
Change IC401
1.3 No POWER –
DDCON/LDO
Check 0.8V_M5_CORE
DDCON (IC804)
21
SYS SET