Sony RB1G Service Manual page 412

Troubleshooting
3-5. No Picture
3-5-6. NO PICTURE: @ Tuner TW
Either
Check IC2121
RF Level =
High
Check IC9001 (Brownie)
L
Check M't condition
in AGC1 line
Analog only
Analog RF or Digital RF
OK
Confirm ANT connection
Which is NG?
Terrestrial or Cable
Both
RF Level = Low
Confirm RF Level and AGC
of Analog RF by Service mode
AGC = 0
Confirm AGC1
IC2151 Pin6
H
Confirm tuner control line
Input signal is too big
Insert Attenuator
No Picture
Noisy Picture
Digital only
Which is NG?
Sound is normal ?
Both
NG
Connect ANT Cable
correctly
RF Level = Low
Confirm RF Level and AGC
of Digital RF by Service mode
NG
Confirm Power supply
Check Power supply
for RF input circuit
A2.5V / LNA_5V
OK
NG
Check M't condition
TU_SCL / TU_SDA
in tuner control line
A_RESET
OK
NG
Confirm IF1 line Check M't condition
IFOUTP1 / IFOUTN1 in IF1 line
OK
Check RF input circuit
include IC2151
W600A/ W603A/ W605A/ W607A/ W650A/ W651A/ W653A/
W654A/ W655A/ W656A/W657A/ W658A/ W670A/ W674A
Yes
Check IC9001(Brownie)/
IC9001(Ayu2)
No sound
RF Level = High
Check Brownie
AGC = 0
circuit
Size
24"
32"
Note:
42"
(AYU2L) – IC9000
50"
(Brownie)- IC9001
RB1G CHASSIS
B* Board Type
(Segment: LW)
OTHERS EUROPE JP
BLX BLE BLJ
BKX/BLX BKE/BLE BKJ/BLJ
BKX/BLX BKE/BLE BKJ/BLJ
BLX BLE -
412