Sony Bravia KDL-55W790B, Руководство по обслуживанию, Страница: 25 / 165

Chassis: RB2G, HE-L
Chassis: RB2G, HE-L 25
2.1-7 - NO POWER: AYU2L CONTROL
RB2G CHASSIS
W700B/ W800B
Troubleshooting
2-1-7 No Power : Ayu2L control 2-1-7. No Power : Ayu2L control
No Power No Power
Check STBY_+3.3V
at AYU2L
(H15, H16, H17 pin

C7376)
Look for
AC_MON
line
at
CN9101 pin12/C9131
or
Adapter/ Gboard failure
NG
NG
Check AC_MON
at AYU2
(C11 pin

C7334)
look for where
STBY_+3.3V
is NG.

C7376)
Adapter/ Gboard failure
(C11 pin

C7334)
Look for MAIN_POWER line
at CN9101 pin11
NG
Check MAIN_PWR
at AYU2
OK
Check STBY_+1.8V
at AYU2L
(H19 pin
look for where
STBY +1 8V
is NG
OK
NG
Check STBY_+1.0V
at AYU2L
look for where
at CN9101 pin11
or replace AYU2
at AYU2
(C13 pin

C7315)
OK
Adapter/
NG
Check + 19.5V(Adapter)
(H19 pin

C7374)
STBY_+1.8V
is NG.
OK
NG
at AYU2L
(J15, J16, J17 pin

C7380)
Check Xtal oscillation
OK
look for where
STBY_+1.0V is NG.
NG
Adapter/
G-board
NG
Or +12V(G-Board)
at CN9101 pin21
NG
Check Xtal oscillation
X7301 , 32.768kHz
(A23, B23 pin

R7398)
NG
Replace
X7301
or
Ayu2L
OK
OK
It might be power supply problem
Please refer "DC/DC converter check" sheet
Or
Check "STBY LED BLINKING" Check STBY LED BLINKING