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55SL80YR-LA, 55SL80YR-TA (CHASSIS:LP91T) - LG TV Service Manual (repair manual). Page 14

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- 14 -
No Raster on PC Signal
Check Input source Cable
And Jack
Pass
Re-soldering or 
Change the defect part
Check the Input/Output
Of P401
Fail
Pass
Check the Input/Output
Of IC100
Re-soldering or 
Change the defect part,
Check FFC cable
Fail
Pass
Re-soldering or 
Change the defect part,
Check RGB EDID Data
Repeat [A], & [B] Process
Pass
Check the Input/Output
Of J104
Fail
Pass
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Pass
No Raster on COMMPONENT Signal
Check Input source 
Cable And Jack
Pass
Re-soldering or 
Change the defect part
Check The input/Output
Of P401
Fail
Pass
Check the Input/Output
Of IC800
Re-soldering or 
Change the defect part
Check FFC Cable
Fail
Pass
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
Check The Input/Output
Of JK101
Fail
Pass
No Raster on HDMI Signal
Check Input source 
Cable And Jack
Pass
Check the Input/Output
Of JK301, JK302, JK303
Fail
Re-soldering or 
Change the defect part
Pass
Pass
Check the Input/Output
Of IC300, IC301, JK302
Fail
Re-soldering or 
Change the defect part
Check HDMI EDID Data
Re-download HDCP
Pass
Pass
Check the Input/Output
Of IC800
Fail
Re-soldering or 
Change the defect part
Repeat [A], & [B] Process
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