Read Sharp LC-20B2EA Service Manual online
15
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No picture (2/3)
Check all the settings microprocessor's adjust process menu.
Is input at pin
(74) of IC801
normal?
Check the AV2
line and its
peripheral parts.
No VIDEO 1
output
Check IC1203
and its
peripheral parts.
No
No
No
Yes
Yes
Yes
No TELETEXT
output
Yes
Is input at pins (2),
(5), (11), and (14)
of IC1203 normal?
Is input at pins (3),
(4) and (5) of
SC1602 normal?
Is output at pins (1)
and (7) of IC1619 and
pin (1) of IC1620
normal?
No
Check connection
cable
Check the R, G
and B line.
No
Check IC1619,
IC1620 and their
peripheral parts.
Is output at pins
(57)~(59) of IC1601
normal?
No
Yes
Check V2VO line
and its peripheral
parts.
Is input at pin (21) of
IC1601 normal?
Check IC1601 and its
peripheral parts.
Is output of
R0~R7
normal?
Is output of
G0~G7
normal?
Is output of
B0~B7
normal?
Yes
Yes
No
No
No
Colour is
unusual
Check R1202 and
its peripheral parts.
Check R1203 and
its peripheral parts.
Check R1204 and
its peripheral parts.
Is in/output of
SPIO and
SPOI normal?
No
No picture
image
inversion
Gradation
defect
Is output of U/D
normal?
No
No
Check R1209 and
its peripheral parts.
Check IC1206,
IC1207, Q1201 and
their peripheral parts.
Is output V0, V7, V17,
V21, V32, V64, V122,
V176, V235 and
V255 normal?
Check IC1106,
IC1107, IC1108,
IC1114, IC1115 and
their peripheral parts.
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