Sony KJ-32W7 C Series Service Manual page 130

Troubleshooting
3-4-10. NO PICTURE: @ Tuner COL-T2 / BRZ / ARG
Tuner
Either
Check IC
Which is NG?
TUS: IC2501
Terrestrial or Cable
TUS-A: IC2602
RF Level=High
AGC=Low
Check IC9001 Confirm RF Level and AGC
(Brownie) of Analog RF by Service mode
AGC = 0
L
Confirm AGC1
(TUS: IC2501 Pin6)
(TUS-A: IC2602 Pin4)
Check M't condition Input signal is too big
in AGC1 line Set LNA off
Analog only
3-4-9
Both
RF Level =Low
AGC=High
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
OK
Confirm tuner control line
TU_SCL / TU_SDA
A_RESET
OK
Confirm IF1 line
IFOUTP1 / IFOUTN1
H
OK
Check RF input circuit
Include
TUS: IC2501 Pin6
TUS-A: IC2602 Pin4
No Picture
Noisy Picture
Digital only
Which is NG?
Analog RF or Digital RF
Both
OK
Confirm ANT connection
NG
Connect ANT Cable
correctly
NG
Check Power supply
circuit
DMD_RESET / OSC_ENBN-1
NG
Check M't condition
in tuner control line of Digital RF by Service mode
AGC=Low
NG
Check M't condition
in IF1 line
Yes
Check IC9001(Brownie)/
Sound is normal ?
IC9001(Ayu2)
No sound
Error free
Confirm BER of digital RF Check Brownie and
By Service mode M't condition in TS line
NG
NG
Confirm Power supply
Check Power supply
for Digital Demod
DDEM1.1V / DDEM3.3V
OK
NG
Confirm Demod control line
Check M't condition
I2CB_SCL / I2CB_SDA
in Demod control line
OK
AGC=High,
Confirm RF Level and AGC Check M't condition
in AGC2/IF2 line
Check IC2201
Note:
(AYU2) – IC9000
(Brownie)- IC9001
circuit