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MT-42PM13B (CHASSIS:RF-04GC) - LG TV Service Manual (repair manual). Page 27

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(7) in case of becomes unusual display from RGB DTV mode
(8) in case of becomes unusual display from RGB PC mode
(8) in case of becomes unusual display from DVI mode
Is normal the
CXA2101?
Yes
Is normal the
M52758?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Is normal the
M52758?
Yes
Is normal the Scaler?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Is normal the Scaler?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
Yes
Is normal the Scaler?
Is normal the Input voltage, IIC
Communication and HV sync?
No
Replace the IC
No
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