Read LG 42PB4DTH-UB / CHASIS / PA72A Service Manual online
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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
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