47LB9R1 (CHASSIS:LP7AB) - LG TV Service Manual (repair manual). Page 18

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(4) When set doesn’t display normally at RF , AV mode
(5) When set doesn't display nromally at Component, RGB mode
(6) In the case of becomes unusual display from HDMI mode
Yes
Replace IC1200
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC1200 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
Yes
Replace IC611
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC611 
normal?
Replace IC800
No
Is the Input voltage, 
IIC Communication and 
HV sync normal?
No
Is the IC800 
normal?
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