Sharp LC-22LE240E

63
LC-22LE240
21.6. USB Problems
Problem: USB is not working or no USB Detection.
Check USB Supply, It should be nearly 5V.
21.7. 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.
21.8. 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.
21.9. Standby On/Off Problem
Problem:
Device cannot boot, TV hangs in standby mode.
Check HP detect pin, when headphone is connected. Check 5V_VCC and 3V3_VCC
with a voltage meter.