Sony XR-55A95K Service Manual page 22

TROUBLESHOOTING
1.2 No Power U – com Failure
BM5S22 Board OLED Model when Mounted on IC401
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Check P_ON_#2
no
CL417 or
P-on u-com #pin13 (IC401)
is >3.0V?
yes
Check P_ON_HL
no
CL415 or
P-on u-com #pin18 (IC401)
is >3.0V?
yes
Check ORESETB
no
CL416 or
P-on u-com #pin14 (IC401)
Is the voltage >3.0V?
yes
Check X_BL_MUTE no
CL412 or R459 Voltage.
Is the voltage >3.0V?
yes
Change IC401
Change IC401
Change IC401
Check "X_BE_RST" (from SOC Muffin).
*If X_BE_RST is >3.0, SOC BE(IC5000) problem.
Otherwise, SOC Muffin 5 (IC1000) problem.
no
Check BL_ON
CL420 or R471 Voltage.
Is the voltage >3.0V?
yes
END
u-com IC401 is working OK
Change IC401
SYS SET
22