No Picture: Tuner Uc/ Kr - Sony KDL-40W900A Service Manual

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