LG KG300 Service Manual page 44

Display Problem
Start
YES
Check J402 and LCM FPC
YES
Check U403_C429, C434, C428
YES
Check RN401
YES
Display will work properly
U403
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NO
Change LCM or Re-solder J402
NO
Change C429, C434, C428
NO
Replace RN401
J402
4. Troubleshooting
C428
C429
RN401