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Sharp LC-65D90U - Page 45

Sharp LC-65D90U
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45
LC-65D90U
TROUBLE SHOOTING TABLE (Continued)
NO
NO
YES
NO
NO
YES
YES
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
No picture from HDMI input
With a HDMI equipment connected, is IC1913 (EEPROM) accessed by I2C to read the
DDC_I2C_CLOCK/DATA data?
Check IC1913 and its peripheral circuits.
Are the RESET#, INT and SCDT signals inputted and outputted at pins (102), (104) and (103) of
IC1912?
Is the signal inputted from the HDMI
(SC1901) connector to the input terminals
R1X0± (pins (62) and (63)), R1X1
± (pins (66)
and (67)), R1X2
± (pins (70) and (71)) and
R1XC± (pins (58) and (59)) of
IC1912 (HDCP_LSI)?
Check the line between IC1912 and IC800 (FPGA).
Check the settings of external HDMI
equipment connected.
Check IC1912 and its peripheral circuits.
Check IC1912 and its peripheral circuits.
Check IC1903, IC1901 and their peripheral
circuits.
Are the HDMI_H and HDMI_L signals outputted from pins (11) and (3) of IC1903 (BUFFER)?
Are the Y, Pb and Pr signals outputted from pins (20), (18) and (16) of IC1901 (MULTIPLEXER)?
Are the HDMI_H and HDMI_L signals outputted to pins (2) and (3) of IC1912, as well as the Y, Pb and Pr signals to pins (14), (1
7) and (20) of IC1912?
Check IC3807 and its peripheral circuits.
Check IC3807, IC1903 and their peripheral
circuits.
Are the HDMI_H and HDMI_L signals outputted from pins (9) and (10) of the AV unit's connector PB (P5404)?
Are the Y, Pb and Pr signals outputted from pins (22), (20) and (18) of the AV unit's connector PB (P5404)?
Check the "PB" harness.
Are the HDMI_H and HDMI_L signals inputted to pins (9) and (10) of the main PWB's connector PB (CN1800)?
Are the Y, Pb and Pr signals inputted to pins (22), (20) and (18) of the main PWB's connector PB (CN1800)?
Check IC3701, IC3702 and their peripheral
circuits.
Are the HDMI_H and HDMI_L signals inputted to pins (26) and (25) of IC3701 (A/D_CONV.)?
Are the Y, Pb and Pr signals inputted to pins (8), (11) and (13) of IC3702 (L.P.F.)?
Check IC3700 and its peripheral circuits.
Are the Y, Pb and Pr signals inputted to pins (8), (2) and (14) of IC3700 (A/D_CONV.)?
Are the Y, Pb and Pr signals outputted to pins (20), (18) and (16) of IC3807 (MULTIPLEXER)?

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