LG 32LC4D (CHASSIS:LT73A) Service Manual ▷ View online
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2. Protect mode
(1) Symptom
1) After lighting once it does not discharge minutely
from module.
2) The relay falls.(There is an audible “Click”.)
3) The color of the front LED turns from green to red.
3) The color of the front LED turns from green to red.
(2) Check following
Is the Power Board
normal ?
Replace Power Board.
Is output the normality Low/High
voltage except Stand-by 5V?
voltage except Stand-by 5V?
Yes
No
No
Are the
each connector
normal?
Replace the connector.
After remove P900 normal operation,
replace VSC Board.
replace VSC Board.
After Checking each connector does
is operate corretly?
is operate corretly?
Yes
No
No
Is the VSC-Board
normal?
Is the output voltage normal after
remove P900, P901 of VSC-B/D?
remove P900, P901 of VSC-B/D?
No
3. No Raster
(1) Symptom
1) No OSD or image are displayed on the screen.
2) The front LED remains green.
2) The front LED remains green.
(2) Check following
Check the LCD Module
Replace the
Power board.
Power board.
Does
minute discharge
at Module?
Is the inverter on?
Is output the normality
Low/High voltage
except Stand-by 5V?
Low/High voltage
except Stand-by 5V?
Yes
No
No
Is the LVDS cable
normal?
Yes
Is the
IC700(FLI8548)
output normal?
Reconnect the LVDS cable in P800.
No
Replace the VSC.
No
Yes
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4. In case of occur strange screen into specific mode
4-1. In case of does’t display the OSD
(1) Symptom
1) LED is green.
2) The minute discharge continuously becomes accomplished from module
2) The minute discharge continuously becomes accomplished from module
(2) Check following
Is the LVDS cable
normal?
Is the VSC Board
normal?
Is the LVDS cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Is the FIL8548 IC
(IC700) operated?
Replace FIL8548 IC
(IC700).
No
Is the Control Board
of Module normal?
Replace Control B/D.
No
No
Replace the VSC B/D.
Yes
Replace cable.
Yes
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4-2. In case of does’t display the screen into specific mode
(1) Symptom
- The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check following
1) Check the all input mode should become normality display.
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
2) Check the Video(Main)/Data(Sub), Video(Main)/Video(Sub) should become
normality display from the PIP mode or DW mode. (Re-Check it Swap)
(3) In case of becomes unusual display from RF mode
(4) In the case of becomes unusual display from S-video/ AV mode
(5) In the case of becomes unusual display from Component, RGB mode
Is the Tuner normal?
Is the CXA2069Q
normal?
Is the Tuner Cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Block A
Is the FIL8532
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
Yes
Is the Input voltage, IIC
Communication and HV
sync normal?
sync normal?
Is the Input voltage, IIC
Communication and HV
sync normal?
sync normal?
No
Replace the IC.
No
No
Replace the IC.
No
Is Video input of th AV
Jack(P1400) normal?
Yes
Is the CXA2069Q
normal?
Yes
Same as Block A.
Check the inpt source.
No
Is the Input voltage, IIC
Communication and HV
sync normal?
Communication and HV
sync normal?
No
Replace the IC.
No
Is R,G,B input and H,V Sync
of the J1100 normal?
Yes
Same as Block A.
No
Check the input source.
(6) In the case of becomes unusual display from HDMI mode
(7) In the case of becomes unusual display from SCART1 mode
(8) In the case of becomes unusual display from SCART2 mode
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Is the HDMI002(IC1004)
normal?
Yes
Same as Block A.
Is the Input voltage, IIC
Communication and HV
sync normal?
Communication and HV
sync normal?
No
Replace the IC.
No
Is Video input of A/V jack
normal(J1200)?
Yes
Same as Block A.
No
Check the input source.
Is Video input of A/V jack
normal(J1201)?
Yes
Same as Block A.
No
Check the input source.
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