Sharp LC-40D68UT Service Manual page 51

COMPONENT: No external input video [INPUT-1]
Is INPUT-1 selected on the input select menu screen?
Is the INPUT-SELECT for the input signal?
Select INPUT-1 on the input select menu screen for
the right input signal.
Does the INPUT-1 C1_PLUG detection function?
Check the line between pin (2) of input terminal (J503)
and pin (J2) of IC8001 (CPU).
1) J503: pin (2)
2) SC501/SC601: pin (18)
3) IC8001: pin (J2)
YES
Are there the COMPONENT video signal inputs at pins (B13/B15)
(Y)/(A10) (Pb) and (A7) (Pr) of IC8001 (CPU)?
Check the line between the input terminals of J508 and
IC8001.
1) J503 pin (3) (Y)
2) SC501/SC601 pin (6) (Y) pin (7) (Pb) pin (8) (Pr)
3) IC8001 pin (B13/B15) pin (A10) pin (A7)
YES
Are the LVDS signal outputs at the LVDS 1st channel and 2nd channel of
IC8001?
LV0OUT0P/M (N19/N20), LV0OUT1P/M (N21/N22), LV0OUT2P/M (P19/P20),
LV0OUT3P/M (R19/R20), LV0OUT4P/M (R21/R22), LV0CK0P/M (P21/P22),
LV1OUT0P/M (J21/J22), LV1OUT1P/M (K19/K20), LV1OUT2P/M (K21/K22),
LV1OUT3P/M (L21/L22), LV1OUT4P/M (M21/M22), LV1CK0P/M (L19/L20)
YES
Check the panel module.
NO
NO
pin (5) (Pb) pin (7) (Pr)
No video (2)
COMPONENT: No external input video [INPUT-2]
Is INPUT-2 selected on the input select menu screen?
Is the INPUT-SELECT for the input signal?
Select INPUT-2 on the input select menu screen for the right
input signal.
Does the INPUT-2 C2_PLUG detection function?
Check the line between pin (2) of input terminal (J504) and pin
(K2) of IC8001 (CPU).
1) J504: pin (2)
2) SC501/SC601: pin (17)
3) IC8001: pin (K2)
YES
Are there the COMPONENT video signal inputs at pins (A13/A15) (Y)/
(B10) (Pb) and (B7) (Pr) of IC8001 (CPU)?
Check the line between the input terminals of J504 and
IC8001.
1) J504 pin (3) (Y)
2) SC501/SC601 pin (2) (Y) pin (3) (Pb) pin (4) (Pr)
3) IC8001 pin (A13/A15) pin (A10) pin (A7)
YES
NO
6 – 2
NO
NO
pin (5) (Pb) pin (7) (Pr)
Check IC8001 and its peripheral circuits.
(IC8251, etc.)
LC-40D68UT