İ. No Sound Problem - Hitachi 55HK6T64U Service Manual

For USB 3.0 ports:
For USB 2.0 port:
İ. NO SOUND PROBLEM
Problem: No audio at main TV speaker outputs.
Check supply voltages of 24V VDD_AUDIO, 3.3V AUDIO_AVDD and AUDIO_DVDD with a voltage-
meter. There may be a problem in headphone connector or headphone detect circuit (when headphone is
connected, speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3v.
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