LG 50PB2DR-AC (CHASSIS:PB61C) Service Manual ▷ View online
- 29 -
2. PVR Audio
(1) Audio path
1) Block Diagram
Main
Audio Processor
(MSP4450K)
Sub
Audio Processor
(MSP4458G)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
AV
AV Switch
(CXA2069)
Front AV
Component 2
Component 1
RGB Audio
Monitor Out
Buffer
(MC33078)
ADC
(CS5331A)
MUX CPLD
(EPM570F256)
PAL Tuner
PAL/COFDM Tuner
HD-2
PVR SOC
(LGDT1304P)
SiI 3512
HDD
HDMI
MST3361
System CPLD
(EPM570T144)
CS8415A
SPDIF Out
(Optical)
(Optical)
SPDIF
L/R
L/R
L/R
L/R
SIF
SIF
TP
I2S
I2S
L/R
I2S
TP
I2S
SPDIF
Check MSP4450K (IC202) Power pins
#12, 13, 65, 66(5V), #39(8V)
Check MSP4450K (IC202) inputs
#19(SCK), #20(LRCK), #22(LRCH)
1
2
3
4
5
6
7
8
9
Check Connector P1611
#10(SCK), #12(LRCK), #LRCH(LRCH)
Check LGDT1102F (IC402)
I2S
outputs
R434(LRCK), R435(SCK), R441(LRCH)
Check MSP4450K (IC202) outputs
#4(SCK), #5(LRCK), #6(LRCH), #74(MCLK)
Check NSP2100A (IC401)
PWM output: R804, R805(LEFT), R802, R803(Right)
PWM mask : R1211(3.3V)
PWM mask : R1211(3.3V)
Check TAS5122 (IC403) outputs
IC402: #34, 35, 38, 39(Left), #46, 47, 50, 51(Right)
Check Speaker output wafer
P403(Right), P404(Left)
Check Speaker
Check MSP4450K (IC202) outputs
#33(MNT_R_OUT), #34(MNT_L_OUT)
Check MNT_OUT JACK (J101)
Check LGDT1102F (IC402)
SPDIF
outputs
R436(IEC958_OUT)
Check EPM570T144 (IC301)
Check SPDIF out (R1035)
ANALOG OUT
DIGITAL OUT
MONITOR OUT
2) Trouble Shooting Gudie - COMMON SOUND OUT
- 30 -
(2) TV RF NO SOUND
1) Block Diagram
Main
Audio Processor
(MSP4450K)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
Monitor Out
Buffer
(MC33078)
ADC
(CS5331A)
PAL Tuner
PAL/COFDM Tuner
HD-2
System CPLD
(EPM570T144)
SPDIF Out
(Optical)
(Optical)
SIF
SIF
I2S
L/R
I2S
I2S
SPDIF
Check MSP4450K (IC202) inputs
#67(M_SIF)
Check MSP4450K (IC202) outputs
#36(SC1_R), #37(SC1_L)
Check Connector
P1611(#2)
1
2
3
4
5
6
Check CS5331(IC1000) in/outputs & Power
#7(5V), #5,8(L/R input), #1(LRCH), #2(SCK),
#3(LRCK), #4(MCLK)
Check LGDT1102F(IC402) inputs
R413(LRCH), R414(LRCK), R415(SCK)
Follow the procedure of
COMMON SOUND OUT
7
8
Check PAL Tuner (TU1301)
#7(33V), #6(5V), #11(SIF)
Check
Antenna
Cable
Check MC33078(IC1001) in/outputs & Power
#8(9V), #2, 6(input), #1, 7(output)
9
#4 (MCLK) :
12.288MHz
#3 (LRCK) :
48KHz
#1 (LRCH) : Not 0 Voltage Level
#36 (SCI_R), 37 (SCI_L) : Not 0 Voltage Level, Analog signal
Check Connector
P103(#16,#18)
10
2) Trouble Shooting Guide
- 31 -
(3) DTV NO SOUND
1) Block Diagram
Main
Audio Processor
(MSP4450K)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
Monitor Out
MUX CPLD
(EPM570F256)
PAL/COFDM Tuner
HD-2
System CPLD
(EPM570)
SPDIF Out
(Optical)
(Optical)
I2S
TP
SPDIF
1
2
3
4
Check LGDT1102F(IC402)
5
Check Tuner (TU1302)
#3,11(5V), #24(IF_N), #25(IF_P)
Check
Antenna
Cable
Check Mux CPLD(IC305)
Follow the procedure of
COMMON SOUND OUT
2) Trouble Shooting Guide
- 32 -
Check MSP4450K (IC202) inputs
#56(AV_L), #57(AV_R)
1
2
3
Check CXA2069 (IC101) in/outputs
#2(V_L), #4(V_R), #23(FV_L), #25(FV_R),
#52(AV_L_OUT), #54(AV_R_OUT)
Check
Video/Front Video
Audio Input Cable
Check
Component 1,2 / RGB
Audio Input Cable
Check MSP4450K (IC202) inputs
#53(COMP1_L), #54(COMP1_R), #50(COMP2_L),
#51(COMP2_R), #47(RGB_L), #48(RGB_R)
Check MSP4450K (IC202) outputs
#36(SC1_R), #37(SC1_L)
4
5
Check CS5331(IC1000) in/outputs & Power
#7(5V), #5,8(L/R input), #1(LRCH), #2(SCK),
#3(LRCK), #4(MCLK)
Check LGDT1102F(IC402) inputs
R413(LRCH), R414(LRCK), R415(SCK)
Follow the procedure of
COMMON SOUND OUT
6
7
Check MC33078(IC1001) in/outputs & Power
#8(9V), #2, 6(input), #1, 7(output)
8
Check Connector
P103(#16,#18)
9
2) Trouble Shooting Guide
(4)
AV/COMPONENT/RGB NO SOUND
1) Block Diagram
Main
Audio Processor
(MSP4450K)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
AV
AV Switch
(CXA2069)
Front AV
Component 2
Component 1
RGB Audio
Monitor Out
Buffer
(MC33078)
ADC
(CS5331A)
HD-2
System CPLD
(EPM570T144)
SPDIF Out
(Optical)
(Optical)
L/R
L/R
L/R
L/R
I2S
L/R
I2S
I2S
SPDIF
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