Sharp LC-15A2E (serv.man2) Service Manual ▷ View online
LC-15A2E
13
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is source GND
normal?
Is CSCOM
waveform
normal?
Check R1212
and their
peripheral parts.
Check IC1109,
Q1101, Q1102,
D1101, R1120,
R1130 and their
peripheral parts.
Check FB1202
and their
peripheral parts.
Yes
No
No
Becomes
dark
No
Time passes,
becomes
dark
Is gate GND
normal?
Is gate clock
(GCK) normal?
Check R1223
and gate aray
peripheral parts.
Yes
No
Check D1201
and their
peripheral parts.
No
Is B-5.5V being
outputted?
Is VCC being
outputted?
Check T701's
secondary +5V
outputs line?
Yes
No
Is GSP
waveform
normal?
Check R1223
and their
peripheral parts.
Yes
No
Becomes
white.
Is 3.3V VHS
being
outputted?
Is source clock
normal?
Check +3.3V
outputs line of
IC704.
Check R1210,
R1211 and their
peripheral parts.
Check FB1203
and gate aray
peripheral parts.
Is output of LBR
and HG
normal?
Yes
Yes
No
No
No
Vertical line
output
No picture
Check all the settings microprocessor's adjust process menu.
Is output of
R0~R5
normal?
Is output of
G0~G5
normal?
Is output of
B0~B5
normal?
Check R1202,
R1203 and their
peripheral parts.
Check R1204,
R1205 and their
peripheral parts.
Check R1206,
R1207 and their
peripheral parts.
Check T701's
secondary +5V
outputs line.
Yes
Yes
No
No
Colour is
unusual
Is VLS 5V
being
outputted?
No
Picture
image is
gloomy
Is in/output of
SPIO and
SPOI normal?
Check R1209
and their
peripheral parts.
No
No picture
image
inversion
Is output V0,
V16, V32, V48
and V63
normal?
Check IC1106,
IC1107, IC1108
and their
peripheral parts.
No
Gradation
defect
Is output of U/D
normal?
Check Q1201
and their
peripheral parts.
Yes
No
LC-15A2E
14
TROUBLE SHOOTING TABLE
(Continued)
No sound
Check all the settins microprocessor's adjust process menu.
Is the pin 53 of
IC2001 in the
"L" state?
Is output at pins
26 and 27 of
IC901 normal?
Is output at pins
1 and 7 of
IC903 normal?
Yes
Yes
No
No
No
No
No
No sound
from front
speakers
Is output at pins
1 and 7 of
IC303 normal?
Yes
Is output at pins
2 and 11 of
IC301 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and their
peripheral parts.
Check IC903
and their
peripheral parts.
Check IC303
and their
peripheral parts.
Check IC301
and their
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is the pin 53 of
IC2001 in the
"L" state?
Is output at pins
26 and 27 of
IC901 normal?
Is output at pins
1 and 7 of
IC903 normal?
Yes
Yes
No
No
No
No
No
No
Is output at pins
1 and 7 of
IC303 normal?
Yes
Is output at pins
2 and 11 of
IC301 normal?
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC901
and their
peripheral parts.
Check IC903
and their
peripheral parts.
Check IC303
and their
peripheral parts.
Check IC301
and their
peripheral parts.
Yes
Is output at Q25
Q26 normal?
Check Q25 and
Q26 and
connection
cable.
Is the pin 54 of
IC2001 in the
"L" state?
Is output at pin
32 of IC901
normal?
Is output at pin
2 of IC302
normal?
Yes
Yes
No
No
No
Check rear
speaker and
connection
cable.
Yes
Muting effect is
on. Check the
RSMUTE line.
Check IC903
and their
peripheral parts.
Check IC302
and their
peripheral parts.
No sound
from rear
speakers
No sound
from
headphone
Is output at pins
37 and 38 of
IC901 normal?
Is output at pins
1 and 7 of
IC902 normal?
Check IC901
and their
peripheral parts.
Check IC902
and their
peripheral parts.
Yes
No
No
No sound
from output
line
TV sound
failure
Is output at pin
1 of W7 tuner
normal?
Is input at pin
67 of IC901
normal?
Check the tuner
and their
peripheral parts.
Check IC901,
MONOS/SIF
line and their
peripheral parts.
Yes
No
No
LC-15A2E
15
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LC-15A2E
15
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