LG 32LC7D (CHASSIS:LB73A) Service Manual ▷ View online
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2. In case of occurring strange screen into specific mode
2-1. In case the OSD does not displayed
(1) Symptom
1) LED is white.
2) Some discharge on Panel becomes accomplished continuously.
2) Some discharge on Panel becomes accomplished continuously.
(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
Does the Thine IC
(IC900) Operates ?
Replace Thine
(IC900).
No
Is the Ctrl Board of
Module normal?
Replace Ctrl B/D.
No
No
Replace Scaler
(IC401).
No
Does the Scaler
(IC401) Operates ?
Replace VSC
Digital B/D.
Replace the cable.
Yes
Yes
Yes
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2-2. In case of does’t display the screen into specific mode
(1) Symptom
1) 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 using Swap function)
Check the NEC64015(IC701) if the main picture is abnormal, and
Check the NEC64015(IC801) If the sub picture is abnormal.
Check the NEC64015(IC801) If the sub picture is abnormal.
(3) When Analog TV mode is abnormal
(4) When AV mode is abnormal
Is the Splitter normal?
Is the Flat Cables
normal?
Replace Flat Cables.
Is the Tuner Cable
connected well?
Cable inserts well.
Yes
No
No
Yes
Is the CXA2069Q(IC100)
normal?
Replace the Tuner.
No
Is the Input voltage, IIC Communication
and CVBS output normal?
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC.
No
Yes
Is the uPD64015
normal?
Is normal the Input voltage, IIC
Communication and HV sync?
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
No
Replace the IC.
No
Is the CXA2069Q
normal?
Yes
Is the uPD64015
normal?
No
Replace the IC.
No
No
Replace the IC.
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Yes
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(5) When Component or RGB-DTV/ PC mode is abnormal
(6) When HDMI/DVI mode is abnormal
(7) When DVI-PC mode is abnormal
(8) When Digital TV mode is abnormal
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Is the CXA2151Q(IC500)
normal?
Yes
Is the MST3362(IC604)
normal?
Is the MST3362(IC604)
normal?
No
Replace the IC.
No
No
Replace the IC.
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Is the EDID correct?
Yes
Is the latest version the Graphic card
driver of the PC?
Update the Graphic card driver
with the latest version.
with the latest version.
No
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
Cable connected well.
No
Is the Tuner Cable connected
well?
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Is the Splitter normal?
Yes
Replace the Tuner.
Is the Flat Cables
normal?
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Replace the IC.
No
Is the Input voltage, IIC Communication
and HV sync normal?
and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
No
No
Replace the Tuner.
No
Yes
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3. When sound is abnormal
(1) Symptom
1) LED is green.
2) Screen display but sound is not output.
2) Screen display but sound is not output.
(2) Check following
Is the SPK cable
normal?
Is the SPK cable
connected well?
Cable inserts well.
No
No
Is the Flat cable
connected well?
Is the RF(Digital)
sound normal?
Cable inserts well.
No
No
Replace the IC200.
Replace SPK cable.
Yes
Yes
Yes
Is the RF(Analog) / AV/
Component L-R sound
normal?
Is the CS5330A(IC1000),
MC33078(IC1001),
Scaler(IC401) normal?
No
No
Is the MSP4450K
(IC200) normal?
Replace the IC400.
Yes
Is the NSP2100
(IC400) normal?
Replace the IC402.
Yes
Is the TAS5122
(IC402) normal?
Replace the IC400.
Yes
Yes
No
No
No
No
Is the Scaler
(IC401) normal?
Replace
VSC Digital B/D.
Yes
Yes
Replace the IC.
No
Is the SPDIF sound
normal?
Is the XC95288(IC300),
CS8415A(IC1003),
Scaler(IC401) normal?
No
Replace the IC.
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