LC-46X8E (serv.man8). Troubleshooting Table - Sharp TV Parts Guide (repair manual). Page 17

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LC-46X8E/S/RU
4 – 17
<When EXT5/6 is used for external input> No picture on the display (10)
                                             
The HDMI signal input from EXT5/6 doesn’t come out in the display.
MAIN UNIT:                          
EXT5
Is the HOT_PLUG detection signal input to pin (19) of the HDMI 
terminal (SC1501) normal? 
NO
EXT5
Check between pin (19) of SC1501 and pin (16) of IC1507 
(HDMI_SW). (IC1506, etc.)
EXT6
Is the HOT_PLUG detection signal input to pin (19) of the HDMI 
terminal (SC1502) normal? 
NO
EXT6
Check between pin (19) of SC1502 and pin (36) of IC1507 
(HDMI_SW). (IC1506, etc.)
YES
                                             
YES
Check the connection and setup with the external HDMI devices.
EXT5
Is EDID data (SDA/SCL) of IC1501 (EEPROM) accessed, and is 
it read from pins (15, 16) of a HDMI terminal (SC1501)?
NO
Check short-circuit or open circuit of the I
2
C line.
EXT6
Is EDID data (SDA/SCL) of IC1502 (EEPROM) accessed, and is 
it read from pins (15, 16) of a HDMI terminal (SC1501)?
NO
Check short-circuit or open circuit of the I
2
C line.
YES
EXT5
Is TMDS signal (RXC
± - RX2±) input from SC1501 to the pins 
(19/18-28/27) of IC1507?
NO
Check the line between SC1501 and IC1507.
EXT6
Is TMDS signal (RXC
± - RX2±) input from SC1502 to the pins 
(39/38-48/47) of IC1507?
NO
Check the line between SC1502 and IC1507.
YES
Is switched TMDS signal (TMDS_D0
± - D2±) output from pins 
(11-1) of IC1507?
NO
Is the control signal of IC1507 and IC9101 (CPLD) normal?
(HDMI_SW_INT, HDMI_RST, etc.)
YES
Is switched TMDS signal (TMDS_D0
± - D2±) input to pins (L2-P1) of IC3301 (VIDEO_PROCESSOR)?
YES
NO
Refer to “The picture doesn't appear in all modes.”
Check the line between IC1507 and IC3301.

Display

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