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55GA7900-UA (CHASSIS:LA37G) - LG TV Service Manual (repair manual). Page 97

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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 locations.
<GA6400-UD>
LCD  TV
A1
2011. 12 .14
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