Sony BRAVIA KDL-55W900A, Service Manual

Page: 26 / 241

RB1G
CHASSIS
W900A/904A/905A
Troubleshooting
3 1 2 No POWER: Ayu2 Control 3-1-2. No POWER: Ayu2 Control
No Power
Note:
G BOARD : ( N/A FOR THIS MODEL)
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
at F9301(BK* only)
OK
Size B* Board Type G* Board
Type
OTHERS JP
40” BA2-S BA2-W G1A
N t
X7302, 32.768KHz
(A7, B7 pin

R7386)
Replace X7302 or Ayu2
OK
Please refer "DC/DC converter check" sheet
Or
Check "STBY LED BLINKING"
26
46” BA2-S BA2-W G1A
55” BA2-S BA2-W G1B
Note:
(AYU2) – IC9000
(Brownie)- IC9001