LG 42LC2D Series, Service Manual

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3-2. In case of does’t display the screen into specific mode
(1) Symptom
Ø
The screen does not become the display from specific input mode
(RF, AV, Component, RGB, DVI).
(2) Check follow
Ø
Check the all input mode should become normality display.
(3) Abnormal display in RF mode
(4) Abnormal display in AV mode
Is the Tuner normal?
Is IC103 (Switch)
CXA2069Q good?
Is the Tuner Cable
connected well?
Reset cable.
Yes
No
No
Yes
Is the Video Decoder
IC302 UPD64011
good?
Replace Tuner
No
Are the Input voltage, IIC Comm.
and CVBS outputs good?
Yes
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC103
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC302
No
Is IC103 (Switch)
CXA2069Q good?
Yes
Is the Video Decoder
IC302 UPD64011
good?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC103
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC302
No