Sharp Aquos LC 26D7U, Service Manual, Page: 59 / 214

59
LC-26D7U
LC-32D7U
LC-37D7U
TROUBLE SHOOTING TABLE
(Continued)
NO YES
YES
NO
NO
NO
Are signals sent from Hsync (pin 18),
Vsync (pin 19) and RGB (pins 23, 26
and 31) of IC1900 ?
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?
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?
YES
YES
Check IC3700, IC3701
and their peripheral
circuits.
NO
NO
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)?
Check PC settings.
Check IC1915 and its
peripheral circuits.
YES
Check IC1917 and its
peripheral circuits.
Check IC1900 and its
peripheral circuits.
Check IC1901, IC1903 and
their peripheral circuits.
YES
Check the I2C signal line (SCLB/SDAB) of pins (1)
and (2) of IC1917.
Is IC1915 (E2PROM)
accessed with I2C when
connecting to PC and is
data read out? Is IC1911 (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)? Are the output pins (12)
and (14) of IC1917 in (L,
H)?
NO
Do the output pins (12)
and (14) of IC1917
change to (L, L) when
setting to the analog AV
mode? Do the output pins (12)
and (14) of IC1917
change to (H, L) when
setting to the analog PC
mode?
Check MD harness for
disconnection.
NO
No video signal from DVI input (digital) (1)
2 Tip HDCP_LSI
No video signal from digital PC No video signal from digital AV