LG 50PB2DR-AC (CHASSIS:PB61C) Service Manual ▷ View online
- 21 -
Check Antenna Cable
Check Main Picture
Sub Picture (PIP)
Check PAL Tuner
5V, 33V, Video out
Check CXA2069
Power pins, TV
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 PAL/DVB-T Tuner
1.8V, 3.3V, 5V, Video out
Check CXA2069
Power pins, TV
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 uPD64001 power, input signal
_AYI1 signal shape looks like figure7.1
6 : _Check uPD64011 output signal
7 : _Check the signal
8 : _Check the signal
9 : _Check the signal
<Figure7.1>
(Clk
) :
13.5Mhz
IC701
IC705
(3) PVR RF/AV MODE
- 22 -
1. Check follow
1-1. Execution PIP or D/W mode
Analog TV
Is normal the main of D/W MODE when you
execute Analog TV/Analog TV mode ?
Is normal the sub of D/W MODE when you
execute Analog TV/Analog TV mode ?
Is it 5V #6 output of TUNER ( TU1301) ?
Is it 33V #7 output of TUNER(TU1301) ?
Is normal # 9 output of TUNER(TU1301) ?
Replace the TUNER(TU1301) ..
Is it 5V #1,#2 output of TUNER(TU1302) ?
Check the IIC Control (TU1302) ?
Is normal #8 output of TUNER(TU1302) ?
Replace the TUNER(TU1302) .
NO
No
NO
YES
YES
No
YES
YES
Check the IIC Control (TU1301) ?
YES
Is it 3.3V #15, 1.8V #14 output of
TUNER(TU1302) ?
YES
Analog TV
(4) PVR RF MODE (Detailed)
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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 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
Is normal UPD64015 Power(1.5V,3.3V)
Is
noraml
output of
UPD64015
(IC701)?
Digital Output Y(10bit),C(10bit),H/V,FID
(5) PVR RF MODE
- 24 -
Check Signal format
(supported format?)
Check CXA2181(IC501) Power
Pins, Osc
,
Comp1(#41,#42,#43),
Comp2(#1,#2,#17),
RGB(#33,#34,#35,#36,#37)
Check CXA2181(IC501) outputs
#23(Y_out),#22(Cb_out),
#21(Cr_out),#15(V),#16(H)
Check MC14053B(IC505)
Check Connector P101
Check FMS6407(IC610)
Power pins, #3(Y_in),
#5(Cb_in),#7(Cr_in)
Check MST3361(IC603)
Power pins,#44(
Y_in),
#41(Cb_in),#46(Cr_in)
#37(H),#38(V)
Check CPLD (IC301)
HD(#96),VD(#95)
Check CPLD (IC301)
1
2
3
4
5
6
H/V
NG
7
Check MST3361(IC603) Outputs V-
out (#99) , H-out (#98) , Clock (#96)
, Data (30Bit) , DE(#97)
8
Check CY2309 (IC203)
REF(#1), CLKA4(#15)
8
Digital Board
AV Board
7 : _Check the
MST3361(IC603) Output Signals
(Vsync
) :
(DE) :
(Clk
) :
(Hsync
)
59.94Hz
Frequency : Different according to
format !!
(Data) :
8 : _Check
CPLD (IC301) HD(#96),VD(#95)
6 : _
Check MST3361(IC603) Power pins, Input Signals, Signal Shape is Same (above)
9 : _
Check CY2309 (IC203) REF(#1), CLKA4(#15)
_Signal shape is same (above)
(6) PVR COMPONENT/RGB
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