Sharp Aquos LC 26D7U, Service Manual

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56
LC-26D7U
LC-32D7U
LC-37D7U
TROUBLE SHOOTING TABLE
(Continued)
NO YES
YES
YES
NO
NO
NO
NO
NO
Are signals supplied from DVI
(SC1900) connector to input
terminals RX0
± (pins 63 and 62),
RX1 ± (pins 67 and 66), RX2 ± (pins
71 and 70), and RXC ± (pins 59 and
58) of IC1912 (HDCP_LSI)?
Check PC settings.
Check IC1915 and its
peripheral circuits.
Check IC1917 and its
peripheral circuits.
Check IC1912 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)?
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?
NO
Check MD harness for
disconnection.
NO
Check IC3700, IC3701
and their peripheral
circuits.
1 Tip HDCP_LSI
No video signal from digital PC No video signal from digital AV
Are signals sent from Hsync (pin 2),
Vsync (pin 3) and RGB (pins 14, 17
and 20) of IC1912 ?
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?
YES
No video signal from DVI input (digital) (1)