Zenith P42W46X Service Manual page 19

5-2. 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 follow
Check the all input mode should become normality display.
¯
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
Is normal the Tuner?
Yes
Is normal the
CXA2069Q?
Yes
Is normal the
VPC3230?
(4) In the case of becomes unusual display from RF, AV mode
Is normal the
CXA2069Q?
Yes
Is normal the
VPC3230?
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No
Is the Tuner Cable
connected well?
No
Cable inserts well.
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Is normal the Input voltage, IIC
Communication and HV sync?
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Yes
Is normal the Input voltage, IIC
Communication and CVBS output?
Replace Tuner
No
Replace IC
No
Replace IC
No
Replace IC
No
Replace IC
No