LG 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) Service Manual ▷ View online
- 43 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
DTV NO SOUND
Check LGDT3703 (IC1305) inputs
#22(IF_P), #23(IF_N)
Check LGDT3703 (IC1305) outputs
#44,45,47,49,50,52,54,55(VSB_DATA), #57(ERROR),
#59(VALID), #61(SOP), #62(CLK)
1
2
3
4
5
6
Check LGDT1102F(IC402)
7
Check AT/NT Tuner (TU1300)
#3,11(5V), #24(IF_N), #25(IF_P)
Check
Antenna
Cable
Check Mux CPLD(IC305)
Follow the procedure of
COMMON SOUND OUT
- 44 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
AV/COMPONENT/RGB NO SOUND
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)
L/R
L/R
L/R
L/R
I2S
L/R
I2S
I2S
SPDIF
- 45 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Check MSP4450K (IC201) inputs
#56(AV_L), #57(AV_R)
1
2
3
Check CXA2069 (IC1701) 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 (IC201) inputs
#53(COMP1_L), #54(COMP1_R), #50(COMP2_L),
#51(COMP2_R), #47(RGB_L), #48(RGB_R)
AV/COMPONENT/RGB NO SOUND
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
- 46 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
HDMI NO SOUND
Main
Audio Processor
(MSP4450K)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
Monitor Out
HD-2
HDMI
MST3361
System CPLD
(EPM570T144)
CS8415A
SPDIF Out
(Optical)
SPDIF
I2S
SPDIF
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