Sharp LC-20B5E (serv.man16) Service Manual ▷ View online
25
LC-20B5E
TROUBLE SHOOTING TABLE
(Continued)
No picture (2/3)
Check all the settings microprocessor's adjust process menu.
Is input at pin
(2) of IC2201
normal?
Check IC2201
and its peripheral
parts.
No VIDEO 1
output
Check the V2_SY-line,
V2_SC-line and their
peripheral parts.
Is input at pin (10) ,
(12) of IC3401
normal?
No S-VIDEO
output
Check IC8801
and its
peripheral parts.
No
No
No
No PC Card
output
Yes
Yes
Yes
No TELETEXT
output
Is input at pins (1),
(2), (3), and (79) of
IC8801 normal?
No
Check the R, G, B
and FB line.
Is input at pins (6)~(8)
and (14) of IC1602
normal?
No
No
Yes
No
Yes
No
No
Yes
Check their lines
and its peripheral
parts.
Is output at pins
(57)~(59) and (60) of
IC1601 normal?
Check IC1601 and its
peripheral parts.
Are the card medium
and its files normal?
Is the voltage at pins
(24), (27), (74) and
(77) of SC5401 at the
PC card part normal?
Is the voltage at pin
(3) of IC5409 and
pins (1), (2) and (3)
of IC5004 normal?
Check the medium
and its files.
Check the power
supply line.
Check the power
supply line.
Is output at IC8602
and IC8606 normal?
Check that line.
26
LC-20B5E
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 UD
normal?
Yes
No
Check R1265 and its
peripheral parts.
Check R1261 and
its peripheral parts.
Check IC1201, R1224
and its peripheral
parts.
Check R1266 and its
peripheral parts.
Check R1267 and its
peripheral parts.
Is output V0, V7, V21,
V64, V112, V176,
V235 and V255
normal?
Check IC1101 and its
peripheral parts.
27
LC-20B5E
TROUBLE SHOOTING TABLE
(Continued)
No sound (2/2)
Check all the settings microprocessor's adjust process menu.
Yes
No
No
No sound
from SCART
No
SCART sound
failure
Check IC3201
and its peripheral
parts.
Is output at pins
(36) and (37) of
IC3201 normal?
Check IC3210
and its peripheral
parts.
Is output at pins
(1) and (7) of
IC3210 normal?
Check their lines
and their
peripheral parts.
Is input at pins
(2) and (4) of
IC1900 normal?
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
IC3201 normal?
Yes
Yes
No
No
No
No sound
from front
speakers
Yes
Muting effect is
on. Check the
FSMUTE line.
Check IC3201
and its
peripheral parts.
Is the pin (52) of
IC2001 in the
"L" state?
Is output at pins
(24) and (25) of
IC3201 normal?
Is output at pins
(1) and (7) of
IC3305 normal?
Yes
Yes
No
No
No
Yes
Muting effect is
on. Check the
HP_MUTE line.
Check IC3201
and its
peripheral parts.
Check IC3305
and its
peripheral parts.
No sound
from
headphone
TV sound
failure
Is output at pins
(33) and (34) of
IC3201 normal?
Is output at pins
(1) and (7) of
IC3211 normal?
Check IC3201
and its
peripheral parts.
Check IC3211
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
(14) of Tuner
normal?
Is input at pin
(67) of IC3201.
Check IC3201
and its
peripheral
parts.
Check
Headphone Jack
and connection
cable.
No
Is output at pins
(8) and (12) of
IC3304 normal?
Check IC3304
and its
peripheral parts.
Check front
speaker and
connection
cable.
Yes
Is output at pins
(1) and (7) of
IC3301 normal?
Check IC3301
and its
peripheral parts.
28
LC-20B5E
8
7
10
9
6
5
4
3
2
1
A
B
C
D
E
F
G
H
CHASSIS LAYOUT
MAIN Unit
CARD LED Unit
R/C, LED Unit
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