Sony KDL-48W7 C Series, Service Manual

Page: 105 / 193

3-4-8 : NO PICTURE: @ Tuner TW
105
Troubleshooting
Note: Board Details refer Section 3
main page.
No Picture
Noisy Picture
Which is NG?
Analog RF or Digital RF
Both
Sound is normal ?
Check IC9001(Brownie)/
IC9000 (Ayu2)
Yes
Confirm ANT connection
Digital only
Confirm RF Level and AGC
of Digital RF by Service mode
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
Confirm RF Level and AGC
of Analog RF by Service mode
Analog only
OK
No sound
Check RF input circuit
include IC2501
Check IC9001 (Brownie)
Confirm AGC1
IC2501 Pin6
Check M’t condition
in AGC1 line
Input signal is too big
Insert Attenuator
Confirm tuner control line
TU_SCL / TU_SDA
A_RESET
Confirm IF1 line
IFOUTP1 / IFOUTN1
Check Brownie
AGC = 0 AGC = 0
L
H OK
OK
OK
Check Power supply
circuit
Check M’t condition
in tuner control line
Check M’t condition
in IF1 line
NG
NG
NG
Which is NG?
Terrestrial or Cable
Both
Either
Check IC2501
NG
Connect ANT Cable
correctly
RF Level =
High
RF Level = Low RF Level = Low
RF Level = High
Note:
(AYU2) – IC9000
(Brownie)- IC9001