Read Sharp LC-50LE761K Service Manual online
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LC-42/50LE762
LC-42/50LE761
LC-42/50LE760
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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 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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E. Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working
Check keypad supply on MB90.
5. Keypad Touchpad Problems
6. USB Problems
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