PN-E702 (serv.man3) - Sharp Monitor Service Manual (repair manual). Page 126

PN-E702/E602　TROUBLESHOOTING

 7 – 3

Is the battery power alive?

Is the adjustment lock of "FUNCTION" set to [disabled]?

No abnormality 

Yes

Consumption

No

Replace the battery.

Clear the setting.

Replace the abnormal part.
Replace the main PWB.

No abnormality

Abnormality

Abnormality

Check the main PWB and the related parts for any 
abnormality. 
   Check the connection cable.  
   Check the fuse (F103) for breakage.  
   Check the PWB.

Replace the abnormal part.
Replace the Key PWB.

Check the key PWB and the related parts for any 
abnormality. 
   Check the connection cable.  
   Any problem with the Key PWB?

Check the adjustment and setting for any abnormality.

Readjust and reset with the menu.

Is input selection set to signal input?

Adjust the input source properly.

Replace the graphic board. 
Check the connected devices.

Replace the abnormal part.

Is the menu displayed under the signal input state?

Replace the abnormal part.

No abnormality

Yes

No abnormality

Yes

Yes

Abnormality

Abnormality

Abnormality

No

No

No

HDMI connection only
    Any defect with the connected devices?
    Is the graphic board resolution proper?

Check the  main PWB and the related parts.
    Check the connection cable.  
    Check the fuse (F102, F801) for breakage. 
    Can it communicate via RS232C/LAN?
    Check the PWB.

Check the video input signal for any abnormality. 
   Check the video cable. 
   Check that the video signal is not a special one  
   (out of support).

Check the LCD module and the related parts for any 
abnormality.
    Check the connection cable.  
    Check the LCD control PWB.

Vcom (Common electrode voltage) 
adjustment is required when replaced C-PWB 
or LCD module.