Read Sharp LC-20B2EA (serv.man5) Service Manual online
12
LC-20B2EA
TROUBLE SHOOTING TABLE
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13
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No picture
(1/3)
No picture at all
No TV and S-VIDEO output
No TV output
No VIDEO2 output
Check all the settings microprocessor's adjust process menu.
Is in/output of
Check IC801
Is in/output of
Check IC402
Is volt
ages at
Check their
Check V1.IN line
IC801 normal?
No
and its
IC402 normal?
No
and its
pins 6,7,18 of
No
power lines.
No
and its
Yes
Yes
Yes
Yes
Yes
Yes
Yes
tuner normal?
Is in/output of
Check IC1201
Is input at pin
Check IC801,
Is ou
tput at pin
Check tuner
IC1201 normal?
No
and its
73 of IC801
No
AV1 line and
13 of tuner
3 of tuner
No
and its
perip
h
era
l parts.
perip
h
era
l parts.
perip
h
era
l parts.
perip
h
era
l parts.
perip
h
era
l
parts.
normal?
th
eir
Check LCD
Is input at pin
Check its line.
pane
l vo
ltages
an
d
wave
form.
Is the pins 2
Check IC402
and 4 of IC402
No
No
No
and its
at "H" and "L"
peripheral parts.
state?
Is the pins 65
Check its lines.
normal?
normal?
and 66 of
IC2001 at "H"
and "L"state?
Is input at pin
75 of IC801
normal?
perip
h
era
l parts.
14
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No picture
(2/3)
No S-VIDEO output
No VIDEO1 output
No TELETEXT output
Check all the settings microprocessor's adjust process menu.
Is input at pin
Check SY-line,
Is input at pin
Check AV2
Is input at pins
Check
IC1203
1 of IC402 and
No
SC-line
and
their
74 of IC801
No
line and its
2,5,11,14 of
Yes
and its
pin 71 of IC801
peripheral parts.
normal?
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
IC1203 normal?
Is output at pins
Check
3~5 of
Yes
connection
SC1602 normal?
cable.
Is output at pins
Is output at pins
Is input at pin
Check IC1601
1 and 7 of
Yes
Yes
57~59 of
No
No
No
No
No
21 of IC1601
Yes
and its
IC1619 and pin
IC1601 normal?
normal?
peripheral parts.
normal?
Check IC1619,
IC1690 and their
Check the
Check V2VO
line and its
normal?
1 of IC 1620
R,G,B line.
15
LC-20B2EA
TROUBLE SHOOTING TABLE
(Continued)
No picture
(3/3)
Colour is unusual
No picture image inversion
Gradation defect
Check all the settings microprocessor's adjust process menu.
Is output of
Check R1202
Is in/output of
Check R1209
Is output V0,V7,
V17,V21,V32,
V64,V122,V176,
V235,and V255
normal?
Check IC1106~
IC1108, IC1114
IC1115 and their
R0~R7
No
and its
SPIO and
No
No
and its
normal?
normal?
normal?
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
peripheral parts.
SPIO normal?
Yes
Y
es
Is output of
Is output of
Check R1204
Is output of U/D
Check IC
1206
G0~G7
Yes
B0~B7
No
No
and its
normal?
No
IC1207,Q1201
and their
Check R1203
and its
