Sony XBR-65Z9D Service Manual page 23

FLOW
1-2. NO POWER U-COM FAILURE
from the previous page
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
(R433) is 0V
Check X_BE_RST
P-on ucom #pin17
Is the voltage >3.0V?
yes
If BL_MUTE (R435) is 0V
Check BL_ON
P-on ucom #pin18
Is the voltage >3.0V?
yes
XBR-65/75/100Z9D
no
Change IC401
no
Change IC401
no
Change IC401
no
Change IC401
no
Change IC401
END
Ucom IC401 is working OK
DC_OFF_DET check
START
no
Check DC_OFF_DET
R420
Is voltage < 3V?
yes
no
Check Vdd
C418
Is voltage < 5V?
yes
END
IC400 is working OK
TROUBLE SHOOTING
END
IC400 is working OK
Change IC400
23