Read Sharp PN-S655 (serv.man3) Service Manual online
PN-S655
TROUBLESHOOTING
5 – 2
4. The backlight does not light up.
Yes
Refer to "3. The display doesn't show / Display abnormality".
Does the main power PWB supply STB5V/ 12V/ 19V/ 24V?
Refer to "1. The power is not supplied".
Replace the abnormal part.
Replace the abnormal part.
5. Sound is not reproduced/ Reproduced 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.
Repla ce the abnormal part.
Replace the abnormal part.
6. Daisy chain is not made / Display abnormality
Is input selection set to signal input?
Readjust and reset with the menu.
Replace the abnormal part.
Replace the abnormal part.
Yes
No
Yes
No abnormality
No abnormality
No abnormality
No abnormality
No abnormality
No abnormality
No abnormality
No
Abnormality
Abnormality
Abnormality
Is input selection set to audio signal input?
Adjust the input source properly.
When input HDMI, check the OSD setting.
When input HDMI, check the OSD setting.
Yes
No
Abnormality
Abnormality
Abnormality
Abnormality
Abnormality
Abnormality
Abnormality
Abnormality
Check the inverter and the related parts for any abnormality.
Check the LCD inverter PWB.
Check the connection cable.
Check the connection cable.
Check the CCFT lamp.
Check the I/F PWB 1 for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the I/F PWB.
Check the fuse for breakage.
Check the I/F PWB.
Check the audio input signal for any abnormality.
Check the cable connection.
Check the audio cable.
Check the audio cable.
Check the audio output cable for any abnormality.
Check the cable connection.
Check the audio cable.
Check the audio cable.
Check the external speaker and the related parts for any abnormality.
Check the speaker cable.
Check the speaker.
Check the speaker impedance.
Check the speaker.
Check the speaker impedance.
Check the I/F PWB 2 and the related parts for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the PWB.
Check the fuse for breakage.
Check the PWB.
Check the I/F PWB 1 and the related parts for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the PWB.
Check the fuse for breakage.
Check the PWB.
Check the DVI cable for any abnormality.
Check the DVI cable connection.
Check the I/F PWB 1 and the related parts for any abnormality.
Check the connection cable.
Check the fuse for breakage.
Check the PWB.
Check the fuse for breakage.
Check the PWB.
When the power is turned on, the backlight lights up for several
seconds.
seconds.
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