LG 60PB4DT-UB (CHASSIS:PA72A) Service Manual ▷ View online
- 41 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
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 NTSC Tuner (TU1302)
#4(33V), #7,18(5V), #16(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
TV RF NO SOUND
Check Connector
P103(#16,#18)
10
- 42 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
DTV NO SOUND
Main
Audio Processor
(MSP4450K)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
Monitor Out
MUX CPLD
(EPM570F256)
AT/NT Tuner
HD-2
Main
(LGDT3703)
System CPLD
(EPM570)
SPDIF Out
(Optical)
I2S
TP
SPDIF
- 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
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