Trouble Shooting - LG LC370WXN-SAB1-621 Service Manual

Means that the screen is not affected by the signal data when you connect the product to Backlight or
No Display
user connector and then 12V input power ON/OFF.
Less than Electricity
Consumption
150mA
User Connector
(C-PCB CN1) Cold NG
soldering/Open/Short
Check
OK
Fuse(F1)
NG
Open Check
OK
C18,19,67,68,69,70
NG
Short Check

Trouble shooting

Input Current
User Connector(CN1)
Resoldering / Replace
/ Reassembly
Fuse(F1) Replace
C18,19,67,68,69,70
Resoldering / Replace
More than Electricity
Consumption
150mA
FFC(CN4,6)
Assembly / Open Check
OK
Power Block - Out Voltage
-After of Open the U9
Output Check
VCC(+3.3V)
VGL(-5.0V),VDD(+16.5V)
VGH(+24.0V)
OK
VCC Generation Block
Cold soldering/Open/
Short Check
R99, 89~93,C78~82
L1,D12
OK
VDD Generation Block
Cold soldering/Open/
Short Check
R51,53,56,57,
C57,58,C50~54,56,59
D11,L2
OK
VGH_S Generation Block
Cold soldering/Open/
Short Check
R81,84,86~88,C73~75,D15
OK
VGH Modulation Block
Cold soldering/Open/
Short Check
R76, C101, C102
OK
TCON Block(UL1)
Output Data Check
NG
FFC(CN4,6)
Reassembly / Replace
NG
U9/Under the Parts
Resoldering / Replace
Under the Parts
NG
Resoldering / Replace
Under the Parts
NG
Resoldering / Replace
Under the Parts
NG
Resoldering / Replace
NG
Under the Parts
Resoldering / Replace
NG
UL1/Under the Parts
Resoldering / Replace