Sony KD-49X9 F Series Service Manual page 17

1.2 No Power u-com Failure
Previous page
no
Check P_ON_#2
CL417 or P-on u-com #pin13
is >3.0V?
yes
no
Check P_ON_HL
CL414 or P-on u-com #pin18
is >3.0V?
yes
no
Check ORESETB
CL416 or P-on u-com #pin14
Is the voltage >3.0V?
yes
no
Check X_SYSTEM_RST
CL412 or P-on u-com #pin20
Is the voltage >3.0V?
yes
no
Check X_LED_MUTE
R441 or P-on u-com #pin8
Is the voltage >3.0V?
yes
CU Segment / LCD Model
Change IC401
Change IC401
Change IC401
Change IC401
Check "X_BE_RST" (from SOC Muffin).
*If X_BE_RST is >3.0, SOC BE(IC4000) problem.
Otherwise, SOC Muffin(IC1000) problem.
no
Check BL_ON
R527 or P-on u-com #pin7
Is the voltage >3.0V?
yes
END
u-com IC401 is working OK
Change IC401
17