Read LG 42LV375H-ZA (CHASSIS:LD03X) Service Manual online
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3. Analog RF Video Trouble Shooting guide
Check RF Cable.
(TU2701 RF Cable)
(TU2701 RF Cable)
You should replace Cable.
N
Check TU2701 Pin 11(Video
out put). Can you see the
normal signal?
out put). Can you see the
normal signal?
Could you measure voltage of
TU2701 & IIC lines?
Are they all normal?
TU2701 & IIC lines?
Are they all normal?
N
Y
You should check power line &
IIC line.
IIC line.
N
Check the input(PinAD9) of
BCM3556(IC100).
Measure waveform at
C110 or R2112 because it’s
more easy to check.
Can you see the normal
waveform?
BCM3556(IC100).
Measure waveform at
C110 or R2112 because it’s
more easy to check.
Can you see the normal
waveform?
Y
This board has big problem
because Main chip(BCM3556)
have some troubles.
After checking thoroughly all
path once again, You should
decide to replace BCM3556 or
not.
because Main chip(BCM3556)
have some troubles.
After checking thoroughly all
path once again, You should
decide to replace BCM3556 or
not.
Y
You should replace TUNER.
Y
4. Digital RF Trouble Shooting guide
Check RF Cable.
MPI to TU2701 RF Cable
MPI to TU2701 RF Cable
You should replace Cable.
N
Check TU2701 power
Pin 16 (2.5 V), Pin 13(1.2 V)
Pin 16 (2.5 V), Pin 13(1.2 V)
Check IC2701.
N
Y
Replace IC2701.
N
Check IIC signal TU2701
Pin 17, 18
Pin 17, 18
Check IIC Line
SCL2_3.3 V/SDA3_3.3 V
SCL2_3.3 V/SDA3_3.3 V
N
Y
Check FE_TS_DATA[0].
Replace TU2701.
N
Y
Check Power of IC2802 (3.3 V /
1.8 V / 5 V).
1.8 V / 5 V).
Check IC2800/ IC2803.
N
Y
Check IC2800/ IC2803.
N
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