LG 50PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
3. Digital TV Video Trouble Shooting
Check RF Cable
Y
Check TP Clock, Data, Sync
R630, R631, R632 , R633
N
Maybe Demodulator has problems
Y
Maybe MstarS7LR(IC101)
has problems
Check Tuner(TU1300) Power
(5.0V, 3.3V, 1.2V)
N
Replace one of Bead
& Recheck
Y
Check IF Signal pin #17, 18
N
Maybe Tuner has problems
Y
Check Demodulator Power
(*Brazil Model only)
(3.3V, 1.2V) L609, IC600
N
Replace L609 / IC600
Y
Check Demodulator X-TAL
(X602)
N
Replace X-TAL
Y
4. Analog TV Video Trouble Shooting
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
(Audio Out)
(USB)
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
NANDFlash
128MB
NANDFlash
128MB
SPDIF
I2S_S7LR
Serial_Flash
1MB
Serial_Flash
1MB
EXT_IN
HDMI 1
CVBS
TP
SIF
HDMI 2
HDMI 3
USB2.0
Side USB
Side USB
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Comp1/2, RGB)
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
REAR HDMI_PORT
4. Analog TV Video Trouble Shooting
Check RF Cable
Y
Check CVBS Signal
TU1300 #11 Pin
N
Y
Check CVBS Signal
R1334
N
Replace one of
R1330/Q1305/R154/C213
& Recheck
Y
N
Y
Check Tuner Power
(5.0V, 3.3V, 1.2V)
Replace one of
L506/L509/IC600
& Recheck
Maybe Tuner(TU1300) has problems
Maybe Mstar S7LR(IC101)
has problems
5. Component Video Trouble Shooting
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Audio Out)
(Comp1/2, RGB)
(USB)
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
NANDFlash
128MB
NANDFlash
128MB
SPDIF
I2S_S7LR
Serial_Flash
1MB
Serial_Flash
1MB
EXT_IN
HDMI 1
CVBS
TP
SIF
HDMI 2
HDMI 3
USB2.0
Side USB
Side USB
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
REAR HDMI_PORT
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
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