Sharp LC-65D90U - Page 44

44
LC-65D90U
TROUBLE SHOOTING TABLE (Continued)
NO
NO
NO
NO
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
No picture from DVI input (digital) (1)
No picture from DVI input (analog) (2)
With a PC connected, is IC1915 (EEPROM)
accessed by I2C to read the data?
Are both the output pins (12) and (14) of IC1917
(EEPROM) at the H level?
In the analog AV mode, are both the output pins
(12) and (14) of IC1917 at the L level?
With a PC connected, is IC1911 (EEPROM)
accessed by I2C to read the data?
Are the output pins (12) and (14) of IC1917 at the
L and H levels, respectively?
In the analog PC mode, are the output pins (12) and
(14) of IC1917 at the H and L levels, respectively?
Is the signal inputted from the DVI (SC1900)
connector to the input terminals RX0
± (pins
(43) and (44)), RX1
± (pins (47) and (48)),
RX2± (pins (51) and (52)) and RXC
± (pins
(39) and (40)) of IC1912 (HDCP_LSI)?
Check the I2C signal line (FPGA SCL/FPGA SDA) at pins (1) and (2) of IC1917.
Check the settings of external equipment
connected.
Check IC1915 and its peripheral circuits.
Check IC1917 and its peripheral circuits.
Check IC1912 and its peripheral circuits.
Check IC1903, IC1901 and their peripheral
circuits.
Are the H_sync and V_sync signals outputted from pins (11) and (3) of IC1903 (BUFFER)?
Are the R, G and B signals outputted from pins (20), (18) and (16) of IC1901 (MULTIPLEXER)?
Are the H_sync and V_sync signals outputted to pins (2) and (3) of IC1912, as well as the R, G and B signals to pins (14), (17)
and (20) of IC1912?
Check IC3807 and its peripheral circuits.
Check IC3807, IC1903 and their peripheral
circuits.
Are the H_sync and V_sync signals outputted from pins (9) and (10) of the AV unit's connector PB (P5404)?
Are the R, G and B signals outputted from pins (22), (20) and (18) of the AV unit's connector PB (P5404)?
Check the "PB" harness.
Are the H_sync and V_sync signals inputted to pins (9) and (10) of the main PWB's connector PB (CN1800)?
Are the R, G and B 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 H_sync and V_sync signals inputted to pins (26) and (25) of IC3701 (A/D_CONV.)?
Are the R, G and B signals inputted to pins (8), (11) and (13) of IC3702 (L.P.F.)?
Check IC3700 and its peripheral circuits.
Are the R, G and B signals inputted to pins (8), (2) and (14) of IC3700 (A/D_CONV.)?
Are the R, G and B signals outputted to pins (20), (18) and (16) of IC3807 (MULTIPLEXER)?
No digital PC output
A
A
No digital AV output
With a PC connected, is IC1915 (EEPROM)
accessed by I2C to read the data?
Are the output pins (12) and (14) of IC1917
(EEPROM) at the H and L levels, respectively?
In the digital AV mode, are the output pins (12) and
(14) of IC1917 at the L and H levels, respectively?
With a PC connected, is IC1911 (EEPROM)
accessed by I2C to read the data?
Are both the output pins (12) and (14) of IC1917
at the L level?
In the digital PC mode, are both the output pins (12)
and (14) of IC1917 at the H level?
Is the DVI_H/V signal inputted from the DVI
(SC1900) connector to pins (1) and (3) of
IC1901? Are the R, G and B signals also
inputted to pins (1), (3) and (5) of IC1904?
Check the I2C signal line (FPGA SCL/FPGA SDA) at pins (1) and (2) of IC1917.
Check the settings of external equipment
connected.
Check IC1915 and its peripheral circuits.
Check IC1917 and its peripheral circuits.
No analog PC output No analog AV output