Sharp LC-60 EQ10U Service Manual page 190

LC-60/70EQ10U,SQ10U/15U/17U,TQ15U,UQ17U
COMPOSITE: No external input video [INPUT-6]
Is INPUT-6 selected on the input select menu screen?
NO
Select INPUT-6 on the input select menu
screen for the right input signal.
NO
Does the INPUT-6 CVBS1_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)
YES
Is there the COMPOSITE signal input at pin (AR31) of IC3301
(CPU)?
NO
Check the line between pin (10) of J510
and pin (AR31) of IC3301(CPU).
J510:pin(10)
IC3301:pin(AR31)
YES
Is the T-CON PWB connected?
VBO_LOCKN pin(40) of SC3801 become Low if there is no problem in the connection.
YES
Are the V-By-One HS signal input to the pin of SC3801?
VBO_CN_TXA+/- (36/37pin), VBO_CN_TXB+/- (32/33pin),
VBO_CN_TXC+/- (28/29pin), VBO_CN_TXD+/- (24/25pin).
YES
Check the panel module and harness.
No video (3)
COMPOSITE: No external input video [INPUT-7]
Is INPUT-7 selected on the input select menu screen?
Does the INPUT-7 CVBS2_PLUG detection func-
tion?
Check the line between pin(4) of input terminal(J510)
and pin(E28) of IC3301(CPU).
J510:pin(4)
IC3301:pin(E28)
YES
Is there the COMPOSITE signal input at pin (AR30) of IC3301
(CPU)?
YES
NO
NO
6 – 11
NO
Select INPUT-7 on the input select menu
screen for the right input signal.
NO
NO
Check the line between pin (5) of J510 and
pin (AR30) of IC3301(CPU).
J510:pin(9)
IC3301:pin(AR30)
Check the T-CON PWB and harness.
Check IC3301 and SC3801 and their
peripheral circuits in Main PWB.
Check IC3301 and its peripheral circuits.
(IC3501/IC3502/IC3503/IC3504, etc.)