LG 50PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
9. All Source Audio Trouble Shooting
Make sure you can’t hear any audio
Y
Check Connector P700
N
Y
Y
Check Speaker
Replace Connector
Check Signal
L700, L701, L702, L703
N
Replace one of
Capacitor, Register
& Recheck
Y
Check IC700 Power
17V, 3.3V
L511, L509
N
Replace It & Recheck
Y
Check Mstar S7LR I2S Output
R711, R712, R713, R714
N
Replace It & Recheck
Y
Maybe Mstar S7LR(IC101)
has problems
Replace Speaker
N
N
Maybe STA368 has problems.
Replace It
10. Digital TV Audio 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)
REAR HDMI_PORT
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
Side 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
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
10. Digital TV Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio
trouble shooting
Maybe Mster S7LR internal audio
DSP has problems.
Replace It
N
Follow procedure digital TV video
trouble shooting
N
11. Analog TV Audio 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)
REAR HDMI_PORT
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
Side 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
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
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