51
LC-45GD5U
TROUBLE SHOOTING TABLE
(Continued)
No video signal from DVI input (digital) (1)
NO
Are signals supplied from D
VI (SC1900) connector
to input ter
minals RX0
±
(pins 44 and 43), RX1
±
(pins 48 and 47), RX2
±
(pins 52 and 51), and
RXC
±
(pins 40 and 39) of IC1912 (HDCP_LSI)?
Is IC1915 (E2PROM) accessed with I2C when
connecting to PC and is data read out?
YES
Are H_sync, V_sync, R, G and B signals sent to pins 2, 3, 14, 17 and 20 of IC1912 respectively?
YES
Is IC191
1 (E2PROM) accessed with I2C when
connecting to PC and is data read out?
Check the external equipment settings.
NO
NO
Are the output pins 12 and 14 of IC1917 (E2PROM) in
(H, H)?
YES
Are the output pins 12 and 14 of IC1917 in (L, H)?
Check IC1915 and its peripheral circuits.
NO
NO
Do the output pins 12 and 14 of IC1917 change to (L,
L) when setting to the analog
A
V
mode?
YES
Do the output pins 12 and 14 of IC1917 change to (H,
L) when setting to the analog PC mode?
Check IC1917 and its peripheral circuits.
NO
NO
Check the I2C signals lines (FPGA_SCL/FPGA_SDA)of pins 1 and 2 of IC1917.
No video signal from DVI input (analog) (2)
NO
Are DVI_H/V signals supplied from DVI(SC1900)
connector to IC1901 (pins 1 and 3)?
Are RGB signals supplied to IC1904 (pins 1, 3 and
5)?
Is IC1915 (E2PROM) accessed with I2C when
connecting to PC and is data read out?
YES
YES
Is IC191
1 (E2PROM) accessed with I2C when
connecting to PC and is data read out?
Check the external equipment settings.
NO
NO
Are the output pins 12 and 14 of IC1917 (E2PROM) in
(H, L)?
YES
Are the output pins 12 and 14 of IC1917 in (L, L)?
Check IC1915 and its peripheral circuits.
NO
NO
Do the output pins 12 and 14 of IC1917 change to (L,
H) when setting to the digital
A
V
mode?
YES
Do the output pins 12 and 14 of IC1917 change to (H,
H) when setting to the digital PC mode?
Check IC1917 and its peripheral circuits.
NO
NO
Check the I2C signals lines (FPGA_SCL/FPGA_SDA)of pins 1 and 2 of IC1917.
NO
Check IC1912 and its peripheral circuits.
YES
Are H_sync and V_sync signals sent from pins 1
1
and 3 of IC1903 (BUFFER) respectively?
Are R, G and B signals sent from pins 20, 18 and 16 of IC1901 (MUL
TI_PLEXER) respectively?
NO
Check IC1903, IC1901 and the peripheral circuits.
YES
Are R, G and B signals sent to pins 20, 18 and 16 of IC3807 (MUL
TI_PLEXER) respectively?
NO
Check IC3807 and its peripheral circuits.
YES
Are H_sync and V_sync signals sent from pins 9 and 10 of
A
V
unit connector PB (P5404) respectively?
Are R, G and B signals sent from pins 22, 20 and 18 of
A
V
unit connector PB (P5404) respectively?
NO
Check IC3807, 1903 and the peripheral circuits.
YES
Are H_sync and V_sync signals supplied to pins 9 and 10 of main unit connector PB (CN1800) respectively?
Are R, G and B signals supplied to pins 22, 20 and 18 of main unit connector PB (CN1800) respectively?
NO
Check the "PB" harness.
YES
Are H_sync and V_sync signals supplied to pins 26 and 25 of IC3701 (A/D_CONV
.) respectively?
Are R, G and B signals supplied to pins 8, 1
1
and 13 of IC3702 (L.P
.F) respectively?
NO
Check IC3701, 3702 and the peripheral circuits.
YES
Are R, G and B signals supplied to pins 8, 2 and 14 of IC3700 (A/D_CONV
.) respectively?
NO
Check IC3700 and its peripheral circuits.
No video signal from digital PC
No video signal from digital
A
V
No video signal from analog PC
No video signal from analog
A
V
A
A
