Sharp LC-15A2E (serv.man2) Service Manual ▷ View online
LC-15A2E
9
PAL/PAL60
SECAM
NTSC
y delay
6
11
RF
tint offset
0
0
sub contrast
2
2
sub colour
25
25
y delay
7
10
8
AV1
tint offset
0
0
0
AV2
sub contrast
2
2
2
sub colour
30
30
30
y delay
7
10
8
AVS
tint offset
0
0
0
sub contrast
2
2
2
sub colour
30
30
30
AGC gain start
27
3-1. +B adjustment
Page 9 of MAIN side adjustment process +B-ADJ
Adjust the voltage of the pin 49 of SC401 to 5.0V
Adjust the voltage of the pin 49 of SC401 to 5.0V
±
0.05V.
3-2. Model setting
Page 9 of MAIN side adjustment process MODUL
Set to A2E.
Set to A2E.
3-3. Inch size setting
Page 9 of MAIN side adjustment process INCH SIZE
Set to 15.
Set to 15.
3-4. COMMON BIAS adjustment of LCD module
Page 9 of MAIN side adjustment process COM BIAS
Input the picture of gray scale and adjust it so as to obtain the best contrast.
Input the picture of gray scale and adjust it so as to obtain the best contrast.
3-5. CUTOFF adjustment
Page 9 of MAIN side adjustment process R CUTOFF, B CUTOFF
Adjust it so as to obtain the optimal colour balance.
Adjust it so as to obtain the optimal colour balance.
LC-15A2E
10
TROUBLE SHOOTING TABLE
No picture, No sound
Check all the settings microprocessor's adjust process menu.
Do F2, F3 and F4
function?
Are T701's secondary
outputs, +38V, +16V, +9V,
+5V and -8V normal?
Remove F2, F3 and F4
and check the load side.
Is there short-circuiting?
Is there short-circuiting of
T701 primary side periphery,
Q701, Q710 and S4701.
Replace F2, F3 and F4.
Check S4701 and
connection cable.
Is T701's primary oscillator
waveform normal?
Check T701's secondary
load.
Yes
Yes
No
No
No
No
Yes
Fluorecent lamp failure to light up
Does F1 function?
Is the pin 34 of IC1201 in
the "H" state?
Is the Q754 short-circuiting?
Is there short-circuiting of
T751 and T752 primary
side periphery, Q751~Q753.
Yes
Yes
No
No
No
Yes
Replace the fluorecent lamp
with new one and check
again.
Yes
Check the OFL1 line, IC1201
and their peripheral parts.
Check Q754 and their
peripheral parts.
Check T751, T752,
Q751~Q753 and connection
cable.
LC-15A2E
11
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is in/output of
IC802 normal?
Is in/output of
IC1201 normal?
Check IC802
and its
peripheral parts.
Check IC1201
and its
peripheral parts.
Check IC402
and its
peripheral parts.
Check IC802,
AV1 line and its
peripheral parts.
Check LCD
panel voltages
and waveform.
Yes
Yes
No
No
No picture
at all
Is in/output of
IC402 normal?
Is input at pin
73 of IC802
normal?
Yes
No
No
No TV and
VIDEO 1
output
Is voltages at
pin 3 of W7 and
pins 3, 4, 5 of
W14 tuner
normal?
Is output at pin
2 of W7 tuner
normal?
Check the
power line.
Check tuner
and its
peripheral parts.
Is input at pin
3 of IC402
normal?
Is the pins 2
and 4 of IC402
at "H" and "L"
state?
Yes
Yes
No
No
No
No
No
Yes
No TV output
Is the pins 65
and 66 of
IC2001 at "H"
and "L" state?
Yes
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is input at pin
1 of IC402
normal?
Is the pins 2
and 4 of IC402
at "L" state?
Check the its
line.
Check the its
line.
Check IC402
and its
peripheral parts.
Is the pins 65
and 66 of IC2001
at "L" state?
Yes
Yes
No
No
No
No VIDEO 1
output
LC-15A2E
12
TROUBLE SHOOTING TABLE
(Continued)
No picture
Check all the settings microprocessor's adjust process menu.
Is input at pin
74 of IC802
normal?
Check the AV2
line and their
peripheral parts.
Check the W9,
SY-line, SC-line
and their
peripheral parts.
No
No VIDEO 2
output
Is input at pins
71 and 72 of
IC802 normal?
No
No S-VIDEO
output
Is input at pin
70 of IC802
normal?
Check the
V2VO line and
their
peripheral parts.
No
No line
output
Is input at pins
1, 2, 3, 56, 57
and 79 of IC802
normal?
Is output at pins
11, 13 and 16
of I4 normal?
Check IC802
and their
peripheral parts.
Check I13 and
their
peripheral parts.
Check I9 and
their
peripheral parts.
Check I4 and
their
peripheral parts.
Is output at pins
11, 13 and 16
of I13 normal?
Yes
Yes
No
No
No
No TELETEX
output
Is output at pins
44~49 of I9
normal?
Yes
No
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