Read Sharp LC-30HV4E (serv.man10) Service Manual online
54
LC-30HV4E
No image (1)
A
VC System
YES
NO
No video image on INPUT1
Has "INPUT1" been selected on the Input
Select screen?
Select INPUT1 CVBS on the Input Select
screen.
YES
NO
Is the video signal applied to pin 1 of IC1301
(A
V switch)?
Check lines and devices between pin 20 of
INPUT1 (SC1
101) and pin 1 of IC1301.
YES
NO
Select INPUT2 CVBS on the Input Select
screen.
YES
YES
(A)
(B)
YES
NO
Is the video signal applied to pin 8 of IC1301
(A
V switch)?
Check lines and devices between pin 20 of
INPUT2 (SC1
102 1/2) and pin 8 of IC1301.
NO video image on INPUT2
Has "INPUT2" been selected on the Input
Select screen?
<When video signal is received>
No image (2)
YES
NO
NO video image on INPUT3
Has "INPUT3" been selected on the Input
Select screen?
Select INPUT3 CVBS on the Input Select
screen.
YES
NO
Is the video signal applied to pin 1 of IC1301
(A
V switch)?
Check lines and devices between pin 20 of
INPUT3 (SC1
102 1/2) and pin 15 of IC1301.
YES
NO
Select INPUT4 CVBS on the Input Select
screen.
YES
YES
(C)
(D)
YES
NO
Is the video signal applied to pin 22 of
IC1301 (A
V switch)?
Check lines and devices between pin 3 of
INPUT4 (J2404) and pin 22 of IC1301.
NO video image on INPUT4
Has "INPUT4" been selected on the Input
Select screen?
<When video signal is received>
No image (3)
YES
NO
No
Y/C image on INPUT2
Has "INPUT2" been selected on the Input
Select screen?
Select INPUT2
Y/C on the Input Select
screen.
YES
NO
Is the
Y/C signal applied to pins 10 and 12
of IC1301 (A
V switch)?
Check lines and devices between pins20/15 of
INPUT1 (SC1
101) and pins 10/12 of IC1301.
YES
NO
Select INPUT3
Y/C on the Input Select
screen.
YES
YES
(E)
(F)
YES
NO
Is the
Y/C signal applied to pins 17 and 19
of IC1301 (A
V switch)?
Check lines and devices between pins20/15
of INPUT2 (SC1
102 1/2) and pins 17/19 of
IC1301.
No
Y/C image on INPUT3
Has "INPUT3" been selected on the Input
Select screen?
<When
Y/C signal is received>
No image (4)
YES
NO
No
Y/C image on INPUT4
Has "INPUT4" been selected on the Input
Select screen?
Select INPUT4
Y/C on the Input Select
screen.
YES
NO
Is the
Y/C signal applied to pins 24 and 262
of IC1301 (A
V switch)?
Check lines and devices between pins3/4 of
INPUT1 (J2401) and pins 24/26 of IC1301.
YES
(G)
<When
Y/C signal is received>
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