Zenith P42W46X Service Manual - Page 20

In the case of becomes unusual display from RF, AV, Component 480i mode, In the case of becomes

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TROUBLE SHOOTING GUIDE (5) In the case of becomes unusual display from RF, AV, Component 480i mode Is normal the VPC3230? Yes No Is normal the Input voltage, IIC No Communication and HV sync? Replace IC No Is normal the S2300? Is normal the Input voltage, IIC Communication and HV sync? No Yes Replace IC No Is normal the Scaler? Is normal the Input voltage, IIC Communication and HV sync? No Replace IC (6) In the case of becomes unusual display from Component DTV mode Is normal the 74LS123? Yes No Is normal the Input voltage, IIC No Communication and HV sync? Replace IC Is normal the CXA2101? Yes No Is normal the Input voltage, IIC No Communication and HV sync? Replace IC Is normal the M52758? Yes No Is normal the Input voltage, IIC No Communication and HV sync? Replace IC No Is normal the Scaler? Is normal the Input voltage, IIC Communication and HV sync? No Replace IC - 20 -

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TROUBLE SHOOTING GUIDE
(5) In the case of becomes unusual display from RF, AV, Component 480i mode
(6) In the case of becomes unusual display from Component DTV mode
Is normal the
VPC3230?
Yes
Is normal the S2300?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Yes
Is normal the Scaler?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Is normal the
74LS123?
Yes
Is normal the
CXA2101?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Yes
Is normal the
M52758?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No
Yes
Is normal the Scaler?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace IC
No