22LK330, 22LK330A, 22LK330N, 22LK330U, 22LK335C (CHASSIS:LD01T) - LG TV Service Manual (repair manual). Page 76

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Established 
date 
Standard Repair Process Detail Technical Manual
Revised 
date 
A1
Error 
symptom
Content
Check LCD back light with naked eye
A. Video 
error_No 
video/Normal audio 
After turning on the power and disassembling the case, check with the naked eye, 
whether you can see light from 4 locations.
<ALL MODELS>
LCD  TV
A1
2011. 2 .07
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