Sony KJ-32W7 C Series Service Manual page 112

Troubleshooting
3-4-9. NO PICTURE: @ PA-T2 / CH / HK / AEP-T2S2(Terrestrial part)
Tuner
NG
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
L
Check M't condition
in AGC1 line
Confirm TV system
(B/G,D/K,I,L,M)
OK
RF Level =
Low
Confirm Power supply
for RF input circuit
A2.5V / LNA_5V
AGC = 0
Confirm tuner control line
Confirm AGC1
TU_SCL / TU_SDA
(TUS: IC2501 Pin6)
(TUS-A: IC2602 Pin4)
H
Confirm IF1 line
IFOUTP1 / IFOUTN1
Input signal is too big
Set LNA off
Check RF input circuit
TUS: IC2501 Pin6
TUS-A: IC2602 Pin4
No Picture
Noisy Picture
Analog only
Which is NG?
Analog RF or Digital RF
Both
OK
Confirm ANT connection
NG
Connect ANT Cable
correctly
NG
Check Power supply
circuit
OK
NG
Check M't condition
in tuner control line
A_RESET
OK
NG
Check M't condition
in IF1 line
OK
include
Digital only Yes
Sound is normal ?
No sound
Error free
Confirm BER of digital RF
By Service mode
NG
NG
Confirm Power supply
for Digital Demod
DDEM1.2V (CH/HK) / DDEM1.1V (PA-T2) /
DDEM3.3V
OK
NG
Confirm Demod control line
I2CB_SCL / I2CB_SDA
DMD_RESET / OSC_ENBN-1
OK
AGC = high
Confirm RF Level and AGC
of Digital RF by Service mode
AGC = Low
Check IC2201
Note:
Note: Board Details refer Section 3
(AYU2) – IC9000
main page.
(Brownie)- IC9001
Check IC9001(Brownie)/
IC9001(Ayu2)
Check IC9001
(Brownie) and M't
condition in TS line
Check Power supply
circuit
Check M't condition
in Demod control line
Check M't condition
in AGC2/IF2 line