No Picture: Tuner Aep-T2/ Pa-T2/ Ch/ Hk/ Aep-T2C2S2 - Sony KDL-40W900A Service Manual

Troubleshooting
3-5. No Picture
3-5-7. NO PICTURE: @ Tuner AEP-T2 / PA-T2 / CH / HK / AEP-T2C2S2(Terrestrial part)
NG
Confirm TV system
Set correct TV system
with manual tuning menu
manually
RF Level =
High
Check IC9001
Confirm RF Level and AGC
(Brownie) of Analog RF by Service mode
AGC = 0
L
Check M't condition Input signal is too big
in AGC1 line in AGC1 line
(B/G,D/K,I,L,M)
OK
RF Level =
Low
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
OK
Confirm tuner control line
Confirm AGC1
TU_SCL / TU_SDA
IC2151 Pin6
A_RESET
OK
H
Confirm IF1 line
IFOUTP1 / IFOUTN1 IFOUTP1 / IFOUTN1
Set LNA off Set LNA off
OK
Check RF input circuit
include IC2151
No Picture
Noisy Picture
Analog only Digital only
Which is NG?
Analog RF or Digital RF
Both
OK OK
Confirm ANT connection
NG
Connect ANT Cable
DDEM1.2V (CH/HK) / DDEM1.1V (AEP-T2/PA-T2) /
correctly
NG
Check Power supply
circuit
NG
Check M't condition
in tuner control line
NG
Check M't condition
in IF1 line in IF1 line
Size B* Board Type
OTHERS
40 40" BA2 S BA2-S
Note:
46" BA2-S
(AYU2) – IC9000
(Brownie)- IC9001 55" BA2-S
Yes
Check IC9001(Brownie)/
Sound is normal ?
No sound
Error free
Confirm BER of digital RF
(Brownie) and M't
By Service mode
condition in TS line
NG
Confirm Power supply
NG
Check Power supply
for Digital Demod
DDEM3 3V DDEM3.3V
OK
NG
Confirm Demod control line
Check M't condition
I2CB_SCL / I2CB_SDA
in Demod control line
DMD_RESET / OSC_ENBN-1
OK
AGC = high
Confirm RF Level and AGC Check M't condition
of Digital RF by Service mode in AGC2/IF2 line
AGC = Low
Check IC2201
RB1G CHASSIS
W900A/904A/905A
G* Board
Type
JP
BA2-W BA2 W G1A G1A
BA2-W G1A
BA2-W G1B
IC9001(Ayu2)
Check IC9001
circuit
147