Sony GN3TR - Page 22

XBR-49/55/65/75X900E
TROUBLE SHOOTING
FLOW
1-2. NO POWER U-COM FAILURE
22
Check P_ON_HL
CL414 or P-on ucom #pin18
is >3.0V?
no
yes
If X_BL_MUTE (R441) is >3.0V
Check BL_ON
R527 or P-on ucom #pin7
Is the voltage >3.0V?
no
yes
Check P_ON_#2
CL417 or P-on ucom #pin13
is >3.0V?
no
Check ORESETB
CL416 or P-on ucom #pin14
Is the voltage >3.0V?
no
yes
yes
Check X_SYSTEM_RST
CL412 or P-on ucom #pin20
Is the voltage >3.0V?
Change IC401
no
yes
Change IC401
Change IC401
Change IC401
Change IC401
END
Ucom IC401 is working OK
Previous page