KDL-65W850A, KDL-65W855A - Sony TV Service Manual (repair manual). Page 17

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RB1G
CHASSIS
W850/855A
Troubleshooting
3-1-2.  No POWER:  Ayu2 Control
3 1 2.  No POWER:  Ayu2 Control
No Power
Check STBY_+3.3V
at AYU2
(F11, G11, K13 pin
 C7348)
Look for AC_MON line 
at CN9101 pin2 (except BK*) or 
G-board  / Adapter failure (LW) 
NG
NG
Check AC_MON
at AYU2
(C6 pin 
 R7352)
look for where 
STBY_+3.3V is NG.
 C7348)
Look for MAIN_POWER line 
NG
Check MAIN_PWR
OK
Check STBY_+1.8V
at AYU2
look for where 
OK
NG
_
at CN9101 pin1 (except BK*) 
or replace AYU2
at AYU2
(A9 pin 
 R7344)
OK
(K5, L5, L10, J7 pin 
 C7349)
STBY_+1.8V is NG.
OK
Check STBY_+1.0V
at AYU2
(N13, P13 pin 
 C7350)
look for where
STBY_+1.0V is NG.
G-board  /
Adapter  (LW)
NG
Check REG+12V
at CN9101 pin7
Check REG+19V
9301(
*
)
NG
Check Xtal oscillation
OK
NG
It might be power supply problem
Please refer "DC/DC converter check" sheet
at F9301(BK* only)
OK
Note:
X7302, 32.768KHz
(A7, B7 pin 
 R7386)
Replace X7302 or Ayu2
OK
Please refer  DC/DC converter check  sheet
Or
Check "STBY LED BLINKING"
(*)
Si
B* B
d T
G* B
d T
17
Note: 
(AYU2) – IC9000
(Brownie)- IC9001
Size
B* Board Type G* Board Type
65”
BA2SC G6&G7B

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