Sharp Aquos LC-80LE642U, Service Manual

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LC-80LE642U
6 – 12
No video (3)
COMPOSITE: No external input video [INPUT-6] COMPOSITE: No external input video [INPUT-7]
Is INPUT-6 selected on the input select menu screen? Is INPUT-7 selected on the input select menu screen?
YES
NO
YES
NO
Select INPUT-6 on the input select menu
screen for the right input signal. Select INPUT-7 on the input select menu
screen for the right input signal.
NO NO
Does the INPUT-6 CVBS1_PLUG detection func-
tion? Does the INPUT-7 CVBS2_PLUG detection func-
tion?
Check the line between pin(9) of input termi-
nal(J510) and pin(D28) of IC3301(CPU).
J510:pin(9)
IC3301:pin(D28)
Check the line between pin(4) of input terminal(J510)
and pin(E28) of IC3301(CPU).
J510:pin(4)
IC3301:pin(E28)
Is there the COMPOSITE signal input at pin (AR31) of IC3301
(CPU)? Is there the COMPOSITE signal input at pin (AR30) of IC3301
(CPU)?
YES
NO
YES
NO
Check the line between pin (10) of J510
and pin (AR31) of IC3301(CPU).
J510:pin(10)
IC3301:pin(AR31)
Check the line between pin (5) of J510 and
pin (AR30) of IC3301(CPU).
J510:pin(9)
IC3301:pin(AR30)
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.