Sharp LC-24DV250K (serv.man4) Service Manual ▷ View online
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LC-24DV250
•
Please check mechanical position of CI module. Is it inserted properly or not?
•
Detect ports should be low. If it is not low please check CI connector pins, CI module pins.
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LC-24DV250
C. Staying in Stand-by Mode
Problem:
Staying in stand-by mode,no other operation.
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin will be logic low. If you detect logic low
on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted
voltage to ground.
This problem indicates a short on Vcc voltages. Protect pin should be logic high while normal
operation. When there is a short circuit protect pin will be logic low. If you detect logic low
on protect pin, unplug the TV set and control voltage points with a multimeter to find the shorted
voltage to ground.
D. IR Problem
Problem: LED or IR not working.
Check LED card supply on MB95 chasis.
E. Keypad Touchpad Problems
Problem: Keypad or Touchpad is not working.
Check keypad supply on MB95.
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LC-24DV250
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LC-24DV250
47
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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