LC-37XD1E (serv.man4). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 17

LC-37XD1E/RU

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<When EXT5 is used for external input>                                                                          No  picture  on  the display (7)

No EXT5 (HDMI) output of the external input system.  

  

Checklist:

  1)  Is "INPUT SOURCE" button

on tne remote control set up correctly? ... See the operation manual and set "INPUT SOURCE" to "EXT5".

  2)  Have you checked the type video signal sent from HDMI-connected external device? ...Confirm the type (it should "RGB", "YCbCr 4:4:4" or 
"YCbCr 4:2:2").
  3)  Have you checked the type of Color matrix sent from HDMI-connected external device? ... Confirm the type (it should be "ITU601" or 
"ITU709".)
  4)  Is ANT-CABLE disconnected or connected improperly? ... Connect it correctly as per the operation manuall

Is "EXT5" selected with

button on the remote control?   

NO

Select "EXT5" with   

button  on the remote control.     

YES

Is the type of video signal  (Signal Type) from HDMI- con-
nected extennal device set?   
    

NO

From MENU-Connections-HDMI setup-EXT5-Signal type, select a 
signal type
 ("RGB", "YCbCr  4:4:4" or "YCbCr 4:2:2")     

YES

Is the type of color signal (Color matrix) from HDMl -connected 
external device set?    

NO

From MENU-Connections-HDMI setup-EXT5-Color Matrix, select a 
color signal type  ( "ITU601" or "ITU709")     

YES

Is TMDS signal (RX*

±signal) sent to pins          (1) - (12) of 

EXT5 (HDMI) termina (SC1901)?    

NO

Is I2C signal (SDA/SCL signal)sent to pins (16) and (15) of  EXT5 
(HDMI) terminal? Check external connection and peripheral cir-
cuits.   

YES

Is 8bit-DIGITAL signal (HDMI- R/G/B) sent from pins (110)- 
(144) of  IC1905 (HDMI-RECEIVER)?    

NO

Check power supply (3.3/1.8V) pins (99) and (74) of  IC1905,
SDA/SCL signal pins (29) and  (30), and peripheral circuits.    

YES

Is 8bit-DIGITAL signal (HDMI- R/G/B) sent to pins (B10) - 
(D15) of  IC3002 (V-PRO.)?    

NO

Check SDA3/SCL3 signal pins (27) and (28), interface between  
IC1905 and lC3002, and peripheral circuits.    

YES

Is LVDS video signal (TA1

± - TD1±) sent to pins  (AB8)/(AC8) - (AB3)/(AC3) of IC3002 (V-PRO.), and 

is CLK signal (CK1

±) sent to pins (AB5)/(AC5)?

Is LVDS video signal (TA2

± - TD2±) sent to pins  (AC2)/(AC1) - (V2)/(V1) of IC3002 (V-PRO.), and is 

CLK signal (CK2

±) sent to pins (Y2)/(Y1)?  

NO

Check pins (G14)/(U10) of 
BU3.3V line of IC3002 (V-
PRO.), pins  (G10)/(N17) of 
BU2.5V line,pins  (U16)/
(G12) of BU1.8V line and 
peripheral circuits.

YES

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