Sharp LC-22DV510K (serv.man2) Service Manual ▷ View online
81
LC-22DV510
LC-24DV510
26.4.
IR Problem
Problem: LED or IR not working
Check LED card supply on MB60 chassis.
26.4 IR Problem
82
LC-22DV510
LC-24DV510
26.5.
Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working
Check keypad supply and KEYBOARD pin on MB60.
26.5 Keypad Touchpad Problems
83
LC-22DV510
LC-24DV510
26.6.
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.
26.6 USB Problems
84
LC-22DV510
LC-24DV510
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.
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.
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.
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.
connected, speakers are automatically muted). Measure voltage at HP_DETECT pin, it should be 3.3v.
26.7 No Sound Problem
26.8 No Sound Problem at Headphone
26.9 Standby On/Off Problem
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