LG 42PC1DG-AA (CHASSIS:PB61A) Service Manual ▷ View online
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2. In case of strange screen display in specific modes
2-1. In case of no OSD display
(1) Symptom
1) LED is white.
2) The minute discharge is continuously accomplished from the module.
2) The minute discharge is continuously accomplished from the module.
(2) Follow check
Is the LVDS cable
normal?
Is the VSC Board
normal?
Is the LVDS cable
connected?
Re-insert the Cable.
Yes
No
No
Yes
Does the Thine IC
(IC900) Operate?
Replace the Thine
(IC900).
No
Is the Ctrl Board of
Module normal?
Replace the Ctrl B/D.
No
No
Replace the Scaler
(IC401).
No
Does the Scaler
(IC401) Operate?
Replace VSC the
Digital B/D.
Replace the cable.
Yes
Yes
Yes
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2-2. In case of there is no display on the screen in specific modes
(1) Symptom
1) There is no screen display from a specific input mode
(RF, AV, Component, RGB, DVI).
(2) Follow check
1) Check the all input modes have normal display.
(3) In case of an unusual display in TV mode
(4) In case of an unusual display in AV model
Is the Splitter normal?
Is the Flat Cables
normal?
Replace the Flat Cables.
Is the Tuner Cable
connected well?
Re-insert the cable
Yes
No
No
Yes
Is the CXA2069Q(IC100)
normal?
Replace the Tuner.
No
Are the Input voltage, IIC Communication
and CVBS output normal?
No
Are the Input voltage, IIC
Communication and HV sync normal?
No
Replace the IC.
No
Yes
Is the uPD64015
normal?
Are the Input voltage, IIC
Communication and HV sync normal?
Are the Input voltage, IIC
Communication and HV sync normal?
Are the Input voltage, IIC
Communication 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
Are the Input voltage, IIC
Communication and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Yes
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(5) In case of an unusual display in Component or RGB-DTV/ PC mode
(6) In case of an unusual display in HDMI/DVI mode
(7) In case of an unusual display in DVI-PC mode
(8) In case of an unusual display in Digital TV mode
Are the Input voltage, IIC
Communication and HV sync normal?
Are the Input voltage, IIC
Communication 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
Are the Input voltage, IIC
Communication and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
No
Are the Input voltage, IIC
Communication 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.
No
No
Are the Input voltage, IIC Communication
and HV sync normal?
Yes
Is the Scaler normal?
No
Replace the IC.
Re-insert the cable
No
Is the Tuner Cable connected?
No
Are the Input voltage, IIC Communication
and output of the tuner?
Is the Splitter normal?
Yes
Replace the Tuner.
Is the Flat Cables
normal?
No
Are the Input voltage, IIC
Communication and HV sync normal?
Replace the IC.
No
Are the Input voltage, IIC
Communication 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. In case of no sound
(1) Symptom
1) LED is Green.
2) Screen display appears but there is no sound.
2) Screen display appears but there is no sound.
(2) Procedure check
Is the SPK cable
normal?
Is the SPK cable
connected?
Re-insert the cable
No
No
Is the Flat cable
connected?
Is the RF(Digital)
sound normal?
Re-insert the cable
No
No
Replace the IC200.
Replace the 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
NoNoNoNo
Is the Scaler
(IC401) normal?
Replace the
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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