LG 26CS410 (CHASSIS:LP24B) Service Manual ▷ View online
- 13 -
TROUBLE SHOOTING
No power
(LED indicator off)
Check 24V, 12V, 3.5V
of Power B/D
Check short of Main B/D
or Change Power B/D
Pass
Check Output of
IC701, IC702, IC705,
IC704, IC709
Check P400 Connector
Change LED Assy
: [A] Process (for non-adapter models)
Fail
Fail
Pass
Pass
Check LED Assy
Check Output of Q720
Pass
Check short of
IC701, IC702, IC705,
IC704, IC709
Fail
Re-soldering or Change defect part
Fail
No power
(LED indicator off)
Check output of adapter
(JK700 : 24V)
Check short of Main B/D
or Change adapter
Pass
Check Output of
IC701, IC702, IC704,
IC705, IC706,IC707,IC708,
IC709,IC800
Check P400 Connector
Change LED Assy
: [A-1] Process (for adapter models)
Fail
Fail
Pass
Pass
Check LED Assy
Check Output of Q720
Pass
Check short of
IC701, IC702, IC704,
IC705, IC706,IC707,IC708,
IC709,IC800
Fail
Re-soldering or Change defect part
Fail
- 14 -
No Raster
: [B] Process
Check LED status
On Display Unit
Repeat [A]/[A-1] Process
Fail
Check PANEL_VCC of LVDS wafer
Check Output of Q720
Fail
Change Inverter Connector
Or Inverter
Fail
Pass
Fail
Pass
Change LVDS Cable
Fail
Check LVDS Cable
Pass
Check Panel Link Cable
Or Module
Change Panel Link Cable
Or Module
Check Inverter Connector
Or Inverter
Pass
No Raster on COMPONENT Signal
Check Input source
Cable And Jack
Pass
Re-soldering or
Change the defect part
Pass
Check the Input/Output
Of IC501
Fail
Re-soldering or
Change the defect part
Repeat [A]/[A-1], & [B] Process
Check The Input/Output
Of JK101
Fail
Pass
No Raster on HDMI Signal
Check Input source
Cable And Jack
Pass
Check the Input/Output
Of JK203
Fail
Re-soldering or
Change the defect part
Pass
Pass
Pass
Check the Input/Output
Of IC501
Fail
Re-soldering or
Change the defect part
Repeat [A]/[A-1], & [B] Process
Pass
- 15 -
No Raster on COMPONENT Signal
Check Input source
Cable And Jack
Pass
Re-soldering or
Change the defect part
Pass
Check the Input/Output
Of IC501
Fail
Re-soldering or
Change the defect part
Repeat [A]/[A-1], & [B] Process
Check The Input/Output
Of JK101
Fail
Pass
No Raster on HDMI Signal
Check Input source
Cable And Jack
Pass
Check the Input/Output
Of JK203
Fail
Re-soldering or
Change the defect part
Pass
Pass
Pass
Check the Input/Output
Of IC501
Fail
Re-soldering or
Change the defect part
Repeat [A]/[A-1], & [B] Process
Pass
No Sound
Check The Input Source
Check The Input/Output
Of IC301
Re-soldering or
Change the defect part
Fail
Pass
Pass
Check The Speaker
Change Speaker
Fail
Check The Speaker Wire
Pass
Change The Source Input
Fail
- 16 -
BLOCK DIAGRAM
PO
W
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B
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AR
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AM
P
N
TP
71
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30
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7
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IC
50
3
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24
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05
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48
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47
53
54
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io
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IC
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7
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16
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24
V
32
33
2
17
LP
F
Pb
In
Pr
In
JK202
U
SB
_5
V
B
11
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H
16
Sub
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CL
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Sub
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19
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IC7
04
LD
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71
0
IC
70
2
2.
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R
EG
M
ai
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2.
5V
M
ai
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3.
3V
Q
72
0
A
O
34
07
A
Pa
ne
l_
Vc
c
IC
70
9
M
P1
49
7
M
ai
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6.
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IC
70
5
To
U
SB
IC
70
4
To
T
U
N
ER
H
3
K
1
U
S
B
_D
N
U
S
B
_D
P
IF_
P
IF_
N
H
2
34
35
3
4
9~
12
21
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