Sony KD-75X7800F Service Manual page 17

1.2 No Power u-com Failure
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Check P_ON_#2
CL417 or P-on ucom #pin13
is >3.0V?
yes
Check P_ON_HL
CL414 or P-on ucom #pin18
is >3.0V?
yes
Check ORESETB
CL416 or P-on ucom #pin14
Is the voltage >3.0V?
yes
Check X_SYSTEM_RST
CL412 or P-on ucom #pin20
Is the voltage >3.0V?
yes
If X_BL_MUTE (R441) is >3.0V
Check BL_ON
R527 or P-on ucom #pin7
Is the voltage >3.0V?
yes
no
Change IC401
no
Change IC401
no
Change IC401
no
Change IC401
no
Change IC401
END
Ucom IC401 is working OK
17
SYS SET