Sharp PN-80TC3 Service Manual

PN-L803C/80TC3 TROUBLESHOOTING 7 - 3
4. THE BACKLIGHT DOES NOT LIGHT UP
Yes
Replace the abnormal part.
No
Yes
No
Abnormality
When the power is turned on, the backlight lights up for
several seconds.
Refer to "3.THE DISPLAY DOESN’T
SHOW/DISPLAY ABNORMALITY".
Is BU5V outputted from the 5V Power Supply PWB?
Are BU12V and 13V outputted from the LED Power PWB?
- Check the connection cable.
- Check the Power PWBs.
- Check the output voltage of the LED driver.
- Check the backlight LED.
Replace the abnormal part.
Abnormality
Check the Main PWB and the related parts for any
abnormality.
- Check the connection cable.
- Check the fuses (12V Power : F2101,
13V Power : F2102) for breakage.
- Check the PWB.
Yes
5. SOUND IS NOT OUTPUTED/ OUTPUT SOUND ABNORMALITY
Is the sound volume is set to the minimum or mute?
Readjust and reset.
Replace the abnormal part.
Replace the abnormal part.
Replace the abnormal part.
No abnormality
No abnormality
No abnormality
No abnormality
Is input selection set to audio signal input?
Yes
No
Abnormality
Abnormality
Abnormality
Abnormality
Check the audio input signal for any abnormality.
- Check the cable connection.
- Check the audio cable.
Check the audio output cable for any abnormality.
- Check the cable connection.
- Check the impedance of the audio cable.
- Check the audio cable.
- Check the speaker cable.
- Check the speaker.
Any defect with the internal speaker and related devices?
Select the input source properly.
Especially about HDMI and Displayport input,
check that the OSD settings fit with the audio
output settings on the source side.
Replace the abnormal part.
Abnormality
- Check the connection cable.
- Check the fuse (AMP Power : F2300) or breakage.
- Check the PWB.
Check the Main PWB and the related parts for any
abnormality.
No abnormality
Replace the abnormal part.
Abnormality
- Check the speaker cable.
- Check that the impedance and the rating of the speaker
are proper.
- Check the speaker.
Any defect with the external speaker and related devices?

Sharp PN-80TC3 Specifications

General

Brand	Sharp
Model	PN-80TC3
Category	Monitor
Language	English