Sharp Aquos LC 26D7U, Service Manual

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57
LC-26D7U
LC-32D7U
LC-37D7U
TROUBLE SHOOTING TABLE
(Continued)
NO YES
YES
YES
NO
NO
NO
NO
NO
NO
Are signals supplied from DVI
(SC1900) connector to IC1901?
Are signals supplied from DVI
(SC1900) connector to and input
terminals RGB (pins 1, 3 and 5) and
H.Vsync (pins 1 and 3) of IC1904?
Check PC settings.
Check IC1915 and its
peripheral circuits.
Check IC1917 and its
peripheral circuits.
Check IC1904 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, L)? Are the output pins (12)
and (14) of IC1917 in (L,
L)?
Do the output pins (12)
and (14) of IC1917
change to (L, H) when
setting to the digital AV
mode? Do the output pins (12)
and (14) of IC1917
change to (H, H) when
setting to the digital PC
mode?
Check MD harness for
disconnection.
NO
Check IC3700, IC3701
and their peripheral
circuits.
YES
Are there Vsync and Hsync signal
outputs at pins (4) and (6) of
IC1904(INVERTER)?
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
1 Tip HDCP_LSI
No video signal from analog PC No video signal from analog AV
No video signal from DVI input (analog) (2)