Sony BRAVIA KDL-55W900A, Service Manual, Page: 137 / 241

RB1G
CHASSIS
W900A/904A/905A
Troubleshooting
3-5-5. NO PICTURE: @ Tuner UC / KR
3-5. No Picture
No Picture
Noisy Picture
Which is NG?
Analog RF or Digital RF
Sound is normal ?
Check IC9001(Brownie)/
IC9001(Ayu2)
Yes Digital only Analog only
Analog RF or Digital RF
Both
( y )
Confirm ANT connection
OK
No sound
NG
Confirm RF Level and AGC
of Digital RF by Service mode
Confirm RF Level and AGC
of Analog RF by Service mode
Check Brownie
RF Level =High
Check Brownie
Connect ANT Cable
correctly
RF Level = Low RF Level = Low
RF Level = High
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
Confirm AGC1
IC2151 Pin6
AGC = 0 AGC = 0
L
Check Power supply
circuit
NG
Input signal is too big
Insert Attenuator
Check M’t condition
in AGC1 line
Confirm tuner control line
TU_SCL / TU_SDA
A_RESET
Confirm IF1 line
H
OK
OK
Check M’t condition
in tuner control line
Check M’t condition
NG
NG
Si B* B d T G* B d
Check RF input circuit
include IC2151
Confirm IF1 line
IFOUTP1 / IFOUTN1
OK
Check M’t condition
in IF1 line
Note:
Size B* Board Type G* Board
Type
OTHERS JP
40” BA2-S BA2-W G1A
46” BA2 S BA2 W G1A
137
Note:
(AYU2) – IC9000
(Brownie)- IC9001
46” BA2-S BA2-W G1A
55” BA2-S BA2-W G1B