LG 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) Service Manual ▷ View online
- 47 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
1
2
Check
HDMI
Cable
Check LGDT1102F(IC402) inputs
3
4
Check CS8415A(IC1006) in/outputs
#14(HDMI_SPDIF), #16(SCK), #17(LRCK),
#18(SPDIF_OUT), #10(SPDIF_CLK)
5
SPDIF BYPASS
CheckMST3361 (IC603) outputs
#125(HDMI_SPDIF_OUT)
HDMI NO SOUND
Follow the procedure of
COMMON SOUND OUT
Check EPM570T144 (IC301)
Check SPDIF out (R1035)
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BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
RECORD & PLAY NO SOUND
Main
Audio Processor
(MSP4450K)
Sub
Audio Processor
(MSP4458G)
PWM Modulator
(NSP2100A)
AMP
(TAS5122)
Front Speaker
AV
Front AV
Monitor Out
Buffer
(MC33078)
ADC
(CS5331A)
MUX CPLD
(EPM570F256)
NT Tuner
AT/NT Tuner
HD-2
PVR SOC
(LGDT1304P)
SiI
3512
Main
(LGDT3703)
HDD
System CPLD
(EPM570T144)
SPDIF Out
(Optical)
TP
I2S
I2S
L/R
I2S
TP
I2S
SPDIF
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BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
1
2
Check
HDD SATA
Cable
3
Check siI3512(IC1002) outputs
PCI_AD(32-bits), PCI Control signals
Check siI3512 (IC1002) inputs
#14(B+), #15(B-), #19(A-), #20(A+)
Check PPC405GPr(IC100) in/outputs
PCI_AD(32-bits), PCI Control signals,
PER_ADDR(32-bits), PER_DATA(12-bits),
PER Control signals
4
5
RECORD & PLAY NO SOUND
Follow the procedure of
COMMON SOUND OUT
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BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Hardware Test by using Terminal
Hardware Test by using Terminal
Start the terminal program (
Tera
terminal, DTV Lab)
1 : Press PC keyboard number 1
2 : AC OFF/ON or Push the Reset SW
3 : Enter the command 20 (Hardware test Menu)
Select the Total Test
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