Usb Problems; No Sound Problem; Standby On/Off Problem - Sharp LC-32LE340E Service Manual

F. USB Problems
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V. Also USB Enable should be logic high.
G. No Sound Problem
Problem: No audio at main TV speaker outputs.
Check supply voltages of VDD_AUDIO, 8V_VCC and 12V_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.
H. Standby On/Off Problem
Problem: Device can not boot, TV hangs in standby mode.
There may be a problem about power supply. Check main supplies with a voltage-meter. Also
there may be a problem about SW. Try to update TV with latest SW. Additionally it is good
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LC-32LE340/343
LC-32LE340/343
LC-40LE340/343
LC-40LE340/343