Sharp LC-90LE740X Aquos, Service Manual

Page: 53 / 74

LC-90LE740X
6 – 13
No video (3)
COMPSITE: No external input video [INPUT-5] COMPSITE: No external input video [INPUT-6]
Is INPUT-5 selected on the input select menu screen? Is INPUT-6 selected on the input select menu screen?
YES
NO
YES
NO
Select INPUT-5 on the input select menu screen for
the right input signal. Select INPUT-6 on the input select menu
screen for the right input signal.
NO
Is "VIDEO" selected on the input select menu
screen?
NO
YES
Select "VIDEO" on the input menu
screen for the right input signal.
Is there the COMPOSITE signal input at pin (AT30) of IC3301
(CPU)? Is there the COMPOSITE signal input at pin (AR31) of IC3301
(CPU)?
YES
NO
YES
NO
Check the line between pin (2) of J509
and pin (AT30) of IC3301 (CPU).
J509:pin(2)
IC3301:pin(AT30)
Check the line between pin (2) of J514 and
pin (AR31) of 3301 (CPU)?
J514:pin(2)
IC3301:pin(AR31)
Is the T-CON PWB connected?
VBO_LOCKN pin(40) of SC3801 become Low if there is no problem in the connection. NO Check the T-CON PWB and harness.
Check IC3301 and SC3801 and their
peripheral circuits in Main PWB.
YES
Are the V-By-One HS signal input to the pin of SC3801?
VBO/- (36/37pin), VBO/- (32/33pin),
VBO/- (28/29pin), VBO/- (24/25pin). NO Check IC3301 and its peripheral circuits.
(IC3501/IC3502/IC3503/IC3504, etc.)
YES
Check the panel module and harness.