LG MU-42PM12X Service Manual - Page 21

Abnormal display in Component 480i mode, Abnormal display in Component DTV mode480p, 720p, 1080i

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TROUBLE SHOOTING GUIDE (4) Abnormal display in Component 480i mode Is the Video Decoder No Are the Input voltage, IIC No VPC3230 good? Comm. and HV sync good? Yes Is the DeInterlacer No Are the Input voltage, IIC No S2300 good? Comm. and HV sync good? Yes No Is Scaler good? Are the Input voltage, IIC Comm. and HV sync good? No Replace IC Replace IC Replace IC (5) Abnormal display in Component DTV mode(480p, 720p, 1080i) Is normal the No Are the Input voltage, IIC No 74LS123? Comm. and HV sync good? Yes Is IC401 (CXA2101) No Are the Input voltage, IIC No good? Comm. and HV sync good? Yes Is normal the No Are the Input voltage, IIC No M52758? Comm. and HV sync good? Yes No Is Scaler good? Are the Input voltage, IIC Comm. and HV sync good? No Replace IC Replace IC401 Replace IC Replace IC - 21 -

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TROUBLE SHOOTING GUIDE
(4) Abnormal display in Component 480i mode
(5) Abnormal display in Component DTV mode(480p, 720p, 1080i)
Is the Video Decoder
VPC3230 good?
Yes
Is the DeInterlacer
S2300 good?
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No
Yes
Is Scaler good?
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No
Is normal the
74LS123?
Yes
Is IC401 (CXA2101)
good?
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC401
No
Yes
Is normal the
M52758?
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No
Yes
Is Scaler good?
Are the Input voltage, IIC
Comm. and HV sync good?
No
Replace IC
No