Sony Bravia KDL-55W790B, Service Manual, Page: 86 / 165

Chassis: RB2G, HE-L
Chassis: RB2G, HE-L 86
2.5-4. TUNER COL-T2 / BRZ / ARG
RB2G CHASSIS
W700B/ W800B
Troubleshooting
2-5 No Picture
Tuner
2-5-10. Tuner COL-T2 / BRZ / ARG
2-5. No Picture
No Picture
Noisy Picture
Which is NG?
Analog RF or Digital RF
Sound is normal ?
Check IC9001(Brownie)/
IC9001(Ayu2)
Yes Digital only Analog only
Tuner
Both
Confirm ANT connection
OK
No sound
NG NG
Error free
Confirm BER of digital RF
By Service mode
Check Brownie and
M’t condition in TS line
Either
Connect ANT Cable
correctly
Confirm Power supply
for RF input circuit
Confirm RF Level and AGC
of Analog RF by Service mode
Check IC9001
(Brownie)
Check Power supply
circuit
NG
Confirm Power supply
for Digital Demod
DDEM1.1V / DDEM3.3V
Confirm Demod control line
I2CB_SCL / I2CB_SDA
OK
Check Power supply
circuit
Check M’t condition
in Demod control line
NG
NG
RF Level=High
AGC=Low
RF Level =Low
AGC=High
Which is NG?
Terrestrial or Cable
Both
Check IC2501
Either
A2.5V / LNA_5V
of Analog RF by Service mode (Brownie)
Confirm tuner control line
TU_SCL / TU_SDA
A_RESET
OK
OK
circuit
Check M’t condition
in tuner control line
NG
AGC = 0
DMD_RESET / OSC_ENBN-1
OK
in Demod control line
Check M’t condition
in AGC2/IF2 line
Confirm RF Level and AGC
of Digital RF by Service mode
AGC=Low
AGC=High,
L
Confirm AGC1
IC2151 Pin6
H
Check RF input circuit
i l d IC2501
Confirm IF1 line
IFOUTP1 / IFOUTN1
OK
Check M’t condition
in IF1 line
NG
Check IC2201
Check M’t condition
in AGC1 line
Input signal is too big
Set LNA off
H
include IC2501
Note:
(AYU2) – IC9000
(Brownie)- IC9001