Sharp LC-46X8E/S/RU, Service Manual

Page: 57 / 166

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.