Sony XBR-55X850C Service Manual page 138

3-2-2. NO POWER-U-Com Failure (2/2)
From previous page
A
Yes
Check P_ON_#2
P-on ucom #pin14
Is the voltage >3.0V?
Yes
Check ORESETB
P-on ucom #pin12
Is the voltage >3.0V?
Yes
Check X_SYSTEM_RST
P-on ucom #pin16
Is the voltage >3.0V?
Yes
If PANEL_PWER_ON (R9172) is 0V
Check XRST
P-on ucom #pin17
Is the voltage >3.0V?
Yes
If BL_MUTE (R9174) is 0V
Check BL_ON
P-on ucom #pin18
Is the voltage >3.0V?
Yes
END
Ucom IC9017 is working OK
XBR-55/65X850C, 855C, 857C, 75X850C, 855C
No
Change IC9017
No
Change IC9017
No
Change IC9017
No
Change IC9017
No
Change IC9017
TROUBLE SHOOTING
138