Sharp PN-T322B Service Manual - Page 70

The Backlight Does Not Light Up, 5. No Sound Is Generated/ Reproduced Sound Abnormality, 6. Rs-

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CHAPTER 8. TROUBLESHOOTING 4. THE BACKLIGHT DOES NOT LIGHT UP Is there any abnormality in the inverter or related sections? Is there any abnormality in the connection cable? Is there any abnormality in the LED driver PWB? Is there any abnormality in the I/F PWB? Abnormality Replace the abnormal part with a new one. 5. NO SOUND IS GENERATED/ REPRODUCED SOUND ABNORMALITY Is the sound volume set to minimum or mute? No abnormality Is there any abnormality in the audio input signal? Is there any abnormality in the audio cable? No abnormality Is there any abnormality in the external speaker and related sections? Is there any abnormality in the speaker cable? Is there any abnormality in the speaker? No abnormality Is there any abnormality in the I/F PWB and related sections? Abnormality Abnormality Abnormality Abnormality Readjust and reset. Replace the abnormal part with a new one. Replace the abnormal part with a new one. Replace the abnormal part with a new one. 6. RS-232C CONTROL DOES NOT WORK Are the RS-232C settings of PC correct? No abnormality Any problem with the RS-232C cable? No abnormality Any defect with the I/F PWB and related devices? Any defect with the connecting cable? Any defect with the board? CAUTION You must use the RS-232C cable that is straight. Abnormality Configure the settings of PC again. Abnormality Replace the abnormal part with a new one. Abnormality Replace the abnormal part with a new one. Replace the I/F PWB. PN-T321/T322B TROUBLESHOOTING 8 - 3

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CHAPTER 8.
TROUBLESHOOTING
PN-T321/T322B
TROUBLESHOOTING
8 – 3
4.
THE BACKLIGHT DOES NOT LIGHT UP
5.
NO SOUND IS GENERATED/ REPRODUCED SOUND ABNORMALITY
6.
RS-232C CONTROL DOES NOT WORK
Replace the abnormal part with a new one.
Abnormality
Is there any abnormality in the inverter or related
sections?
Is there any abnormality in the connection cable?
Is there any abnormality in the LED driver PWB?
Is there any abnormality in the I/F PWB?
No abnormality
Abnormality
Readjust and reset.
Is the sound volume set to minimum or mute?
Replace the abnormal part with a new one.
No abnormality
Abnormality
Replace the abnormal part with a new one.
Is there any abnormality in the I/F PWB and related
sections?
Abnormality
Is there any abnormality in the external speaker and
related sections?
Is there any abnormality in the speaker cable?
Is there any abnormality in the speaker?
Replace the abnormal part with a new one.
No abnormality
Abnormality
Is there any abnormality in the audio input signal?
Is there any abnormality in the audio cable?
No abnormality
No abnormality
Are the RS-232C settings of PC correct?
Any problem with the RS-232C cable?
Abnormality
Abnormality
Abnormality
Configure the settings of PC again.
Replace the I/F PWB.
Any defect with the I/F PWB and related devices?
Any defect with the connecting cable?
Any defect with the board?
CAUTION
You must use the RS-232C cable that is straight.
Replace the abnormal part with a new one.
Replace the abnormal part with a new one.