In Case Of Does’t Display The Screen Into Specific Mode; Abnormal Display In Rf Mode; Abnormal Display In Av Mode - LG 42LC2D Service Manual

3-2. In case of does't display the screen into specific mode
(1) Symptom
The screen does not become the display from specific input mode
Ø
(RF, AV, Component, RGB, DVI).
(2) Check follow
Check the all input mode should become normality display.
Ø

(3) Abnormal display in RF mode

Is the Tuner normal?
Yes
Is IC103 (Switch)
CXA2069Q good?
Yes
Is the Video Decoder
IC302 UPD64011
good?

(4) Abnormal display in AV mode

Is IC103 (Switch)
CXA2069Q good?
Yes
Is the Video Decoder
IC302 UPD64011
good?
No
Is the Tuner Cable
connected well?
No
Reset cable.
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Are the Input voltage, IIC
Comm. and HV sync good?
Yes
Are the Input voltage, IIC Comm.
and CVBS outputs good?
No
No
No
No
- 17 -
No
Replace Tuner
Replace IC103
Replace IC302
Replace IC103
Replace IC302