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50PZ750S-ZA, 50PZ755S-ZA (CHASSIS:PD12C) - LG TV Service Manual (repair manual). Page 74

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Making 
Revision 
PDP TV
Symptom
A. Picture Problem
RF Signal level Checking method
Repair Process-Reference data
◆ MENU 
Æ SUPPORT Æ Signal TEST 
1. Check whether Signal Strength, Signal Quality is over 50% or not.
2. If Signal Strength, Signal Quality is under 50%,install the Booster to increase signal level.
A21
A21
2010. 12 . 24
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