No Sound Problem; No Sound Problem At Headphone - Sharp LC-40LE530E Service Manual

13.7. No Sound Problem

Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 5V_VCC and 3V3_VCC 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.

13.8. No Sound Problem at Headphone

Problem: No audio at headphone output.
Check HP detect pin, when headphone is. Check 8V_VCC with a voltage-meter.
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LC-32LE530
LC-40LE530