LG 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) Service Manual ▷ View online
- 23 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Check Antenna Cable
Check Main Picture
Sub Picture (PIP)
Check NTSC Tuner
5V, 33V, Video out
Check CXA2069
Power pins, TV
Check FMS6400
Power pins, Yin
Check Upd64015
Power pins,
Osc
, AYI1
Check uPD64015 outputs
HD, VD,
Check Connector
Check Signal
Data
Check CPLD
HD, VD
Check CY2309
CLKA4
Main Picture
Check ATSC/NTSC Tuner
5V, Video out
Check CXA2069
Power pins, TV
Check FMS6400
Power pins, Yin
Check Upd64015
Power pins,
Osc
, AYI1
Check uPD64015 outputs
HD, VD,
Check Connector
Check 74FCT244
1Y1, 3Y2
Sub Picture
1 : _Check Antenna cable (RF Switch, Tuner ..)
2 : _Execute DW or PIP
3 : _Check Tuners
Vcc
and Video out
4 : _Check CXA2069 power, input signal
_TV, V5 signal shape looks like figure7.1
5 : _Check FMS6400 power, input signal
_Yin signal shape looks like figure7.1
6 : _Check uPD64001 power, input signal
_AYI1 signal shape looks like figure7.1
7 : _Check uPD64011 output signal
8 : _Check the signal
9 : _Check the signal
10 : _Check the signal
<Figure7.1>
(C
lk
) :
13.5Mhz
IC701
IC705
DCR DVR RF/AV MODE
- 24 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
1. Check follow
1-1. Execution PIP or D/W mode
TV
Is normal the main of D/W MODE when you
execution TV/TV mode ?
Is normal the sub of D/W MODE when you
execution TV/DTV mode ?
Is it 5V #6 output of TUNER ( TU1302) ?
Is it 33V #8 output of TUNER(TU1302) ?
Is normal # 16 output of TUNER(TU1302) ?
Replace the TUNER(TU1302) ..
Is it 5V #3,#11 output of TUNER(TU1300) ?
Check the IIC Control (TU1300) ?
Is normal #16 output of TUNER(TU1300) ?
Replace the TUNER(TU1300) .
NO
No
NO
YES
YES
No
YES
YES
DCR DVR RF MODE (Detailed)
(TV/CATV mode does not display .)
Check the IIC Control (TU1302) ?
YES
- 25 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
1. Check follow
1-2. When it is normal output of the TUNER
.
Is normal the main of D/W MODE?
Is normal the sub of D/W MODE?
Is it 9V #42 of CXA2069(IC101) ?
Is normal #56 output of CXA2069(IC101)?
FIG1
Is it 9V #42 of CXA2069(IC101) ?
Is normal #44 output of CXA2069(IC101)?
FIG1
Is normal
outpu
of FMS6400(IC702) ?
FIG2
Is normal UPD64015 Power(1.5V,3.3V)
Is
noramlly
connected P101 to P1612 ?
Flat cable
Is
noraml
output of
UPD64015
(IC701)?
Digital Output Y(10bit),C(10bit),H/V,FID
FIG1
FIG2
(TV/CATV mode does not display .)
DCR DVR RF MODE
Is normal
outpu
of FMS6400(IC704) ?
FIG2
Is normal UPD64015 Power(1.5V,3.3V)
Is
noraml
output of
UPD64015
(IC701)?
Digital Output Y(10bit),C(10bit),H/V,FID
- 26 -
BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
COMPONENT/RGB/HDMI/DVI
OOB
Cable
LGDT3703
LGDT3703
AV1
AV2
RGB
HDMI1
HDMI2
Monitor Out
AT/NT
AT/NT
LGDT3703
LGDT3703
LGDT3502
LGDT3502
CXA2069
CXA2069
CXA2181
CXA2181
COMP1
COMP2
uPD64015
uPD64015
uPD64015
uPD64015
S-Card
S-Card
MST3361
MST3361
VSB TP
QAM TP
1394 Out
MUX CPLD
HDD
EPF
OOB Data
TP
VSB TP
QAM TP
V/Q TP
IF
V2
IF
GEM_CVBS
V1
V2
V_S
V_M
Y/C
RGB/ YC
/YCbCr
V1
HD2_CVBS
IF
PPC405GPr
PPC405GPr
Flash Mem
24MB
Flash Mem
24MB
SDRAM
64MB
SDRAM
64MB
CCIR656
Peri Bus
14bit
IEP2
IEP2
LVDS
LVDS
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)
DDR-32MB
DDR-32MB
656
TP I n2
TP I n1
SiI3512
SiI3512
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
IEP3
HD 2.4
-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
Click on the first or last page to see other 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) service manuals if exist.