Sharp LC-20S1E (serv.man17) Service Manual ▷ View online
17
LC-20S1E
TROUBLE SHOOTING TABLE
(Continued)
No picture (1/3)
Check all the settings microprocessor
’s adjust process menu.
Is in/output of
IC801 normal?
Is in/output of
IC1201 normal?
Check IC801
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check LCD
panel voltages
and waveform.
Yes
Yes
No
No
No picture
at all
Is voltages at
pins (6), (7) and
(18) of tuner
normal?
Is output at pin
(13) of tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
(16) of IC802
normal?
Is the pin (3)
of IC802 at "H"
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pin (48)
of IC2001 at
"H" state?
Yes
Check the its
line.
Check the its
line.
Check IC802
and its
peripheral parts.
Is input at pin
(7) of IC802
normal?
Check V1_V
line and its
peripheral parts.
No
No VIDEO 2
output
18
LC-20S1E
TROUBLE SHOOTING TABLE
(Continued)
No picture (2/3)
Check all the settings microprocessor
’s adjust process menu.
Is input at pin
(14) of IC802
normal?
Check the V2_V
line and its
peripheral parts.
No
No VIDEO 1
output
Check the SY-line,
SC-line and their
peripheral parts.
Is input at pin (9)
of IC802 and pin
(1) of IC805
normal?
No
No S-VIDEO
output
Check IC1201
and its
peripheral parts.
No
Yes
Yes
No TELETEXT
output
Is input at pins (136),
(137), (138), and
(142) of IC1201
normal?
No
Check the R, G
and B line.
Is output at pins
(57)~(59) of IC1601
normal?
No
Yes
Check Vout line and
its peripheral parts.
Is input at pin (21) of
IC1601 normal?
Check IC1601 and its
peripheral parts.
19
LC-20S1E
TROUBLE SHOOTING TABLE
(Continued)
No picture (3/3)
Check all the settings microprocessor
’s adjust process menu.
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
Is in/output of
SPIO and
SPOI normal?
No
No picture
image
inversion
No
Gradation
defect
Is output of U/D
normal?
Yes
No
Check R1224, R1227
and their peripheral
parts.
Check R1234 and
its peripheral parts.
Check IC1202, Q1206
and their peripheral
parts.
Check R1231, R1267
and their peripheral
parts.
Check R1268, R1269
and their peripheral
parts.
Is output V0, V7, V21,
V64, V112, V176,
V235 and V255
normal?
Check IC1101 and its
peripheral parts.
20
LC-20S1E
TROUBLE SHOOTING TABLE
(Continued)
No sound (1/2)
Check all the settings microprocessor
’s adjust process menu.
Is the pin (53) of
IC2001 in the
"L" state?
Is output at pins
(27) and (28) of
IC1900 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC1900
and its
peripheral parts.
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC1900 normal?
Is output at pins
(1) and (7) of
IC350 normal?
Yes
Yes
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC1900
and its
peripheral parts.
Check IC350
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
Is output at pins
(33) and (34) of
IC1900 normal?
Is output at pins
(1) and (7) of
IC3500 normal?
Check IC1900
and its
peripheral parts.
Check IC3500
and its
peripheral parts.
Yes
No
No
No
No sound
from output
line
Check the tuner
and its
peripheral parts.
Yes
No
Is output at pin
(11) of Tuner
normal?
Is input at pin
(67) of IC1900.
Check IC1900
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3301 normal?
Check IC3301
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is output at pins (1)
and (7) of IC1902,
IC1903 and IC1904
normal?
Check IC1902,
IC1903, IC1904 and
their peripheral parts.
Click on the first or last page to see other LC-20S1E (serv.man17) service manuals if exist.