Sharp LC-26D4U Service Manual page 47

TROUBLE SHOOTING TABLE
2 Tip HDCP_LSI
Are signals supplied from DVI
(SC1900) connector to input
terminals RX0 ± (pins 2 and 3), RX1
± (pins 51 and 52), RX2 ± (pins 48
and 49), and RXC ± (pins 5 and 6) of
IC1900 (HDCP_LSI)?
YES
Are signals sent from Hsync (pin 18),
Vsync (pin 19) and RGB (pins 23, 26
and 31) of IC1900 ?
YES
Are DVI_SR/SG/SB and DVI_H/V
signals sent from pins (14), (16), (18),
(30) and (31) of AV unit connector
(SC5701) respectively?
YES
Are DVI_SR/SG/SB and DVI_H/V
signals supplied to pins (20), (18), (16),
(4) and (3) of main PWB connector
(SC3201) respectively?
YES
Are DVI_SR/SG/SB and DVI_H/V
signals supplied to pins (8), (17) and
(23) of IC3700 (A/D_CONV.) and pins
(3) and (13) of IC3701
(SYNC_SELECTER) respectively?
No video signal from DVI input (digital) (1)
No video signal from digital PC
NO
Is IC1915 (E2PROM)
accessed with I2C when
connecting to PC and is
data read out?
Are the output pins (12)
and (14) of IC1917
(E2PROM) in (H, H)?
Do the output pins (12)
and (14) of IC1917
change to (L, L) when
setting to the analog AV
mode?
Check the I2C signal line (SCLB/SDAB) of pins (1)
and (2) of IC1917.
NO
Check IC1900 and its
peripheral circuits.
NO
Check IC1901, IC1903 and
their peripheral circuits.
NO
Check MD harness for
disconnection.
Check IC3700, IC3701
NO
and their peripheral
circuits.
47
(Continued)
No video signal from digital AV
YES
Is IC1911 (E2PROM)
accessed with I2C when
connecting to PC and is
data read out?
NO
YES
Are the output pins (12)
and (14) of IC1917 in (L,
H)?
NO
YES
Do the output pins (12)
and (14) of IC1917
change to (H, L) when
setting to the analog PC
mode?
NO
LC-26D4U
LC-32D4U
LC-37D4U
Check PC settings.
Check IC1915 and its
peripheral circuits.
Check IC1917 and its
peripheral circuits.