Sony BRAVIA KDL-55W900A, Service Manual

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RB1G
CHASSIS
W900A/904A/905A
Troubleshooting
3-5. No Picture
3-5-7. NO PICTURE: @ Tuner AEP-T2 / PA-T2 / CH / HK / AEP-T2C2S2(Terrestrial part)
Size B* Board Type G* Board
Type
OTHERS JP
40” BA2 S BA2 W G1A
No Picture
Noisy Picture
Note:
(AYU2) – IC9000
(Brownie)- IC9001
40 BA2-S BA2-W G1A
46” BA2-S BA2-W G1A
55” BA2-S BA2-W G1B
Which is NG?
Analog RF or Digital RF
Both
Sound is normal ?
Check IC9001(Brownie)/
IC9001(Ayu2)
Yes Digital only
Confirm TV system
with manual tuning menu
(B/G,D/K,I,L,M)
Analog only
OK
Set correct TV system
manually
OK
NG
No sound
Error free
Confirm ANT connection
Connect ANT Cable
correctly
OK
NG
Confirm Power supply
for Digital Demod
DDEM1.2V (CH/HK) / DDEM1.1V (AEP-T2/PA-T2) /
DDEM3 3V
Check Power supply
circuit
NG
Confirm BER of digital RF
By Service mode
Check IC9001
(Brownie) and M’t
condition in TS line
NG
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
Confirm RF Level and AGC
of Analog RF by Service mode
Check IC9001
(Brownie)
OK
Check Power supply
circuit
NG
AGC = 0
DDEM3.3V
Confirm Demod control line
I2CB_SCL / I2CB_SDA
DMD_RESET / OSC_ENBN-1
OK
OK
Check M’t condition
in Demod control line
NG
RF Level =
High
RF Level =
Low
AGC = high
Confirm tuner control line
TU_SCL / TU_SDA
A_RESET
Confirm IF1 line
IFOUTP1 / IFOUTN1
L
OK
Check M’t condition
in tuner control line
Check M’t condition
in IF1 line
NG
NG
Check M’t condition
in AGC2/IF2 line
Check IC2201
Confirm RF Level and AGC
of Digital RF by Service mode
AGC = Low
Confirm AGC1
IC2151 Pin6
Check M’t condition
in AGC1 line
Input signal is too big
Set LNA off
H
Check RF input circuit
include IC2151
IFOUTP1 / IFOUTN1
OK
in IF1 line
in AGC1 line Set LNA off
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