Zenith P42W46X Service Manual page 20

(5) In the case of becomes unusual display from RF, AV, Component 480i mode
Is normal the
VPC3230?
Yes
Is normal the S2300?
Yes
Is normal the Scaler?
(6) In the case of becomes unusual display from Component DTV mode
Is normal the
74LS123?
Yes
Is normal the
CXA2101?
Yes
Is normal the
M52758?
Yes
Is normal the Scaler?
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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?
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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No
Replace IC
No
Replace IC
No
Replace IC
No
Replace IC
No
Replace IC
No
Replace IC
No
Replace IC