No Sound Problem; No Sound Problem At Headphone; Standby On/Off Problem - Sharp LC-40SH340K Service Manual

25.7
26.7.

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.
26.8
26.8.

No Sound Problem at Headphone

Problem: No audio at headphone output.
Check HP detect pin, when headphone is. Check 5V_VCC and 3V3_VCC with a voltage-meter.
26.9
26.9.

Standby On/Off Problem

Problem: Device cannot boot, TV hangs in standby mode.
There may be a problem about power supply. Check 12V_VCC, 5V_VCC and 3V3_VCC with a voltage-
meter. Also there may be a problem about SW. Try to update TV with latest SW. Additionally it is good to
check SW printouts via hyper-terminal (or Teraterm). These printouts may give a clue about the problem.
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LC-40SH340E
LC-40SH340K