No Picture: @ Tuner Uc / Kr - Sony KJ-32W7 C Series Service Manual

Troubleshooting

3-4-7 : NO PICTURE: @ Tuner UC / KR

RF Level =
High
Check Brownie
L
Check M't condition
in AGC1 line
Analog only
Analog RF or Digital RF
OK
Confirm ANT connection
RF Level = Low
Confirm RF Level and AGC
of Analog RF by Service mode
AGC = 0
Confirm AGC1
(TUS: IC2501 Pin6)
(TUS-A: IC2602 Pin4)
H
Confirm tuner control line
Input signal is too big
Insert Attenuator
No Picture
Noisy Picture
Digital only
Which is NG?
Sound is normal ?
Both
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
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
TUS: IC2501 Pin6
TUS-A: IC2602 Pin4
Yes
Check IC9001(Brownie)/
IC9001(Ayu2)
No sound
RF Level = High
Check Brownie
AGC = 0
circuit
93