LG 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) Service Manual ▷ View online
- 31 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
HDD PLAY BACK
OOB
LGDT3703
(IC1305)
LGDT3703
(IC1305)
AV1
AV2
RGB
HDMI1
HDMI2
Monitor Out
AT/NT
NT
LGDT3502
LGDT3502
CXA2069
CXA2069
CXA2181
CXA2181
COMP1
COMP2
uPD64015
(IC705)
uPD64015
(IC705)
uPD64015
(IC701)
uPD64015
(IC701)
S-Card
S-Card
MST3361
(IC603)
MST3361
(IC603)
VSB TP
QAM TP
1394 Out
MUX CPLD (IC305)
HDD
OOB Data
TP
VSB TP
QAM TP
IF V2
GEM_CVBS
V1
V2
V_S
V_M
Y/C
RGB/ YC
/YCbCr
IF
PPC405GPr
(IC100)
PPC405GPr
(IC100)
Flash Mem
24MB
Flash Mem
24MB
SDRAM
64MB
SDRAM
64MB
CCIR656
Peri Bus
14bit
IEP2
IEP2
LVDS
(IC803)
LVDS
(IC803)
PDP/LCD Module
VSB TP
QAM TP
1394 In
CCIR656
TP Out1
MPG656
V/Q TP
TP/D1
Gemstar
Block
Gemstar
Block
Video
Pre-proc
Motion
Estimator
MPEG-2 SD
Video Enc
EISC
ROM
MEM
Int
Timer,
Bus Master
System Decoder
& De-scramblers
(ATSC/DIRECTV
/ARIB/DVB/OC)
Ch Input
I/F
PVR Up
Controller
Video
Feature
Extractor
PVR Down
Controller
ATAPI I/F
SDRAM I/F
Ch Output I/F
SC-AES
DSC-AES
NTSC/PAL
Decoder
DMA
PCI2.2
Audio
Encoder
SCI I/F
PLL/DLL
LGDT1304(PVR SOC IC908)
DDR-32MB
DDR-32MB
656
TP I n2
TP I n1
SiI3512
(IC1002)
SiI3512
(IC1002)
Peri Bus
PCI Bus
PCI Bus
PCI Bus
TP Out11
VSB TP
QAM TP
TP Out2
CCIR656
V/Q TP
VSB TP
QAM TP
1394 Out
V/Q TP
Peri Bus
TP Out12
656
TP I n2
TP I n1
1394 TP_In
IEP3
(IC804)
IEP3
(IC804)
HD 2.4 (IC402)
-TP De-Mux
- MPEG Decoding : MP@HL
-Format Converter
-Host I/F, Memory I/F
-Digital I/F
-NTSC Encoder
-AC-3 Decoder/SPDIF In/out
FMS6400
FMS6400
FMS6400
FMS6400
FMS6407
FMS6407
Cable
- 32 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
HDD PLAY BACK
Check HDD power cable,
Wafer(P1601)
Check HDD Signal Cable(SATA),
Wafer(P1000)
Check SiI3512(IC1002)
Power pins,
Osc
, PCI Bus, LED1000
Check CPLD(IC305) inputs
(CLK), (SOP), (Valid),
(Error),(Data
)
Check CPLD(IC305) outputs
(CLK), (SOP), (Valid),
(Error),(Data
)
1
2
5
4
3
Check PVRSoc
LGDT1304P
(IC908)
1.
Check HDD Power cable. #1: 5V, #4:12V
2.
Check HDD Signal cable (SATA)
3.
Check SiI3512(IC1002) inputs: Power pins,
Osc
¥
Check LED1000 blinking
¥
Check PCI bus
4.
Check CPLD(IC305) inputs:
(Clock, Sop, Valid, Error, Data : 8bit)
PVRSoc
Memory Test :
(Hardware test Menu)
5. Check CPLD(IC305) outputs:
(Clock, Sop, Valid, Error, Data : 8bit)
- 33 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Symptom : TV set powers on ( LED :White ) and off ( LED :Red ) repeatedly of itself. ( No video )
Check X1100 (10MHz)
Normal?
Re-download PIC18F1220(IC1103 )
Normal?
YES
NO
Replace PIC18F1220 (IC1103 )
and Re-download
POWER ON-OFF REPETITION(AUTOMATICALLY)
No Video ?
Check CPLD LED and Re-download
YES
- 34 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Symptom : When TV set powers on, LED is blinking in seconds. And power off(LED is red)
Fan operate normally?
Replace Fans and recheck
5V MNT(P1604 #6) is 5V HIGH?
Check P1604
AC DETECT(P1604 #1) is 5V HIGH ?
NO
No
NO
NO
Replace power board
Normal?
NO
Replace Power board
Normal?
Check P1603 (power)
Power lines and GND short?
Replace A/V board
or digital board
NO
NO
Check A/V board
Micom
Check A/V board
Micom
YES
YES
Check Fan wafers
and connectors.
Normal?
Check Fans
Fan(P1606), upper/side
( 50
: 1EA, 42
: No FAN )
PROTECT MODE
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