Read LG 42PB4DT-UA (CHASSIS:PA72A) (serv.man2) Service Manual online
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BLOCK DIAGRAM & TROUBLESHOOTING GUIDE
Check
D1601, D1602,D1603,
D1604(Digital board)
Check
IC1601,Q1600,Q1602,Q1603
Check LGDP4412(IC804)
(DE), (
C
lk
), (
H
sync
), (
V
sync
)
Check THC63LVD103
(IC803)
#58(DE), #12(Clk), #55(Hsync),
#57(Vsync)
Check P801
#27(DISP_EN), #9(TXCC-),
#10(TXCC+)
Check LVDS
Cable
Check PDP
Module
Control board
1
3
4
5
6
1 : _Check the
D1601, D1602, D1603, D1604 (Digital board)
) ON.
_Check Power connector.
Y
N
Y
Y
YY
Y
2 : _Check the
LGDP4412(IC804)
input signal
#(
Vsync
) :
#(DE) :
#(
Clk
) :
33.75KHz
80.1MHz
#(
Hsync
):
33.75KHz
59.94Hz
3 : _Check the
THC63LVD103 (IC1302)
input signal
_Signal shape is same(above)
4 : _Check the P801
input signal
#27(DISP_EN) :
#9 (TXCC-)
:
80.1MHz
3.3V
GND
#9 (TXCC-)
:
80.1MHz
5 : _Check the
LVDS Cable
6 : _Check the
PDP Module control board
DCR DVR NO OSD
Check LGDT1102F (IC402)
(DE), (
C
lk
), (
H
sync
), (
V
sync
)
2
Y
Check
Power connector
Replace Power board
NY
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