Sony BRAVIA KDL-55W900A, Service Manual, Page: 142 / 241

RB1G
CHASSIS
W900A/904A/905A
Troubleshooting
3-5. No Picture
3-5-6. NO PICTURE: @ Tuner TW
No Picture
Noisy Picture
Which is NG?
Analog RF or Digital RF
Both
Sound is normal ?
Check IC9001(Brownie)/
IC9001(Ayu2)
Yes Digital only Analog only
OK
No sound
Confirm ANT connection
OK
Which is NG?
Terrestrial or Cable
Either
Check IC2121
NG
Connect ANT Cable
correctly
RF L l Hi h
Confirm RF Level and AGC
of Digital RF by Service mode
Confirm RF Level and AGC
of Analog RF by Service mode
Check IC9001 (Brownie)
Check Brownie
AGC = 0 AGC = 0
Both
y
RF Level =High
RF Level = Low RF Level = Low
RF Level = High
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
Confirm AGC1
IC2151 Pin6
Check M’t condition Input signal is too big
Confirm tuner control line
TU SCL / TU SDA
L
H OK
Check Power supply
circuit
Check M’t condition
NG
NG
in AGC1 line
p g g
Insert Attenuator
TU_SCL / TU_SDA
A_RESET
Confirm IF1 line
IFOUTP1 / IFOUTN1
OK
OK
in tuner control line
Check M’t condition
in IF1 line
NG
Si B* B d T G* B d
Check RF input circuit
include IC2151
OK
Note:
Size B* Board Type G* Board
Type
OTHERS JP
40” BA2-S BA2-W G1A
46” BA2 S BA2 W G1A
142
Note:
(AYU2) – IC9000
(Brownie)- IC9001
46” BA2-S BA2-W G1A
55” BA2-S BA2-W G1B