Sharp LC-26D4U Service Manual page 45

TROUBLE SHOOTING TABLE
1 Tip HDCP_LSI
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?
YES
Are there Vsync and Hsync signal
outputs at pins (4) and (6) of
IC1904(INVERTER)?
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 (analog) (2)
No video signal from analog 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, L)?
Do the output pins (12)
and (14) of IC1917
change to (L, H) when
setting to the digital AV
mode?
Check the I2C signal line (SCLB/SDAB) of pins (1) and
(2) of IC1917.
NO
Check IC1904 and its
peripheral circuits.
NO Check IC1901, IC1903 and
their peripheral circuits.
NO
Check MD harness for
disconnection.
NO
Check IC3700, IC3701
and their peripheral
circuits.
45
(Continued)
No video signal from analog 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,
L)?
NO
YES
Do the output pins (12)
and (14) of IC1917
change to (H, H) when
setting to the digital PC
mode?
NO
LC-26D4U
LC-32D4U
LC-37D4U
Check PC settings.
Check IC1915 and its
peripheral circuits.
Check IC1917 and its
peripheral circuits.