LG 24LM530S-PU Service Manual page 33

Standard Repair Process Detail Technical Manual
Error Symptom
Content
A. Video Error, Video lag/stop
Tuner Input Signal Strength Checking Method
All Settings  Channels
 Channel Tuning
 Manual Tuning
 Select channel
When the signal is strong, use the
attenuator (-10dB, -15dB, -20dB etc.)
Established date
Revised date
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A5