Sony KJ-32W7 C Series Service Manual page 105

Troubleshooting
3-4-8 : NO PICTURE: @ Tuner TW
Either
Check IC2501
RF Level =
High
Check IC9001 (Brownie)
Check M't condition
in AGC1 line
Analog only
OK
Which is NG?
Terrestrial or Cable
Both
RF Level = Low
Confirm RF Level and AGC
of Analog RF by Service mode
AGC = 0
L
Confirm AGC1
IC2501 Pin6
H
Input signal is too big
Insert Attenuator
No Picture
Noisy Picture
Digital only
Which is NG?
Analog RF or Digital RF
Both
Confirm ANT connection
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
Confirm tuner control line
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 IC2501
Yes
Check IC9001(Brownie)/
Sound is normal ?
IC9000 (Ayu2)
No sound
RF Level = High
Check Brownie
AGC = 0
circuit
Note: Board Details refer Section 3
main page.
Note:
(AYU2) – IC9000
(Brownie)- IC9001
105