Sharp LC-15SH1E (serv.man10) Service Manual ▷ View online
21
LC-13SH1E
LC-15SH1E
LC-15SH1E
TROUBLE SHOOTING TABLE
No
No
No
Yes
Yes
Yes
Yes
Yes
No
No
Yes
No
Yes
Yes
No
No
Yes
No
Yes
No
Yes
No picture and No sound
Back light lamp failure to light up
Replace F7701.
Is Q7702 base
voltage at "L"
state?
Check all output
voltage line for
short circuit.
Do fuse F7701
function?
Are T7701 secondary
output at C7720,
C7721, C7722, C7723
and C7725 voltage
normal?
Check Q6700-
Q6702, Q6707-
Q6709 and their
peripheral parts for
short circuiting.
Is there any short
circuit in INV +B
line?
Check the OFL1
line, OFL2 line,
IC1201 and their
peripheral parts.
Check the OFL line,
Q3600, Q3601 and
their peripheral
parts.
Check Q6700-
Q6702, Q6707-
Q6709 and their
peripheral parts.
Replace the back
light lamp with new
one and check
again.
Do fuse F6700,
F6702 function?
Are the pins (40)
and (138) of IC1201
in the "H" state?
Are the outputs of
Q3600 and Q3601
in the "L" state?
Is the pins (4) and
(7) of T6701-T6704
normal?
Is the pin (10) of
T6701 normal?
Check the error
amp circuit D6705,
D6707, D6710,
D6712, D6715,
D6716, Q6706,
Q6713 and their
peripheral parts.
Remove F7701 and
check the load side.
Is there short-
circuit?
Is there any short-
circuit in T7701
primary side
periphery?
Check IC7702,
IC7704 and their
peripheral parts.
Check IC7701 and
its peripheral parts.
Is T7701 primary
switching waveform at
pin (1) of IC7701
normal?
22
LC-13SH1E
LC-15SH1E
LC-15SH1E
TROUBLE SHOOTING TABLE
(Continued)
No
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No
No S-Video output
No Picture (1/3)
No picture at all.
No Video 2 output
Check the power
line.
No TV output
Is output Q801,
Q802 and Q803
normal?
Is input / output
of IC1201
normal?
Check LCD panel
voltages and
waveform.
Check IC501 and
its peripheral
parts.
Check IC1201
and its peripheral
parts.
Is voltage at pins
(7) and (9) of
tuner normal?
Is output at pin
(11) of tuner
normal?
Is input / output
of SF201
normal?
Is output of
IC801 normal?
Check IC801 and
its peripheral
parts.
Check SF201 and
its peripheral
parts.
Check tuner and
its peripheral
parts.
Is video input at
pin (B21) of
IC501 normal?
Check the V1_V
line and its
peripheral parts.
Is input at pins
(C18) and (D18)
of IC501 normal?
Check the V1_SY
and V1_SC line
and their
peripheral parts.
23
LC-13SH1E
LC-15SH1E
LC-15SH1E
TROUBLE SHOOTING TABLE
(Continued)
No
Yes
No
No
No Picture (2/3)
R/G/B
CVBS
No Video 1 Output (SCART)
Is input at pin (C18)
of IC501 normal?
Check V1_SY line
and its peripheral
parts.
Is input at pins (U23),
(V23) and (V24) of
IC501 normal?
Check SC_R, SC_G,
SC_B line and their
peripheral parts.
No TELETEXT
output
No Video from
SCART
Check Q3908,
Q3909 and their
peripheral parts.
Is output at pin (B23)
of IC501 normal?
Check IC501 and its
peripheral parts.
Check IC501 and its
peripheral parts.
No
No
No
Yes
Yes
No
No
Yes
No
Is output of U/D normal?
No Picture (3/3)
Color is unusual
Gradation defect
Is output R0-R7 at
SC1202 normal?
Is output G0-G7 at
SC1202 normal?
Is output B0-B7 at
SC1202 normal?
Check R1205 and its
peripheral parts.
Check R1206 and its
peripheral parts.
Check R1207 and its
peripheral parts.
No picture image
Is input/output of SPIO
and SPOI normal?
Check R1216 and its
peripheral parts.
Check R1210 and its
peripheral parts.
Is output V0, V7, V21,
V64, V112, V176, V235
and V255 normal?
Check IC1101 and its
peripheral parts.
24
LC-13SH1E
LC-15SH1E
LC-15SH1E
TROUBLE SHOOTING TABLE
(Continued)
No
No
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No Sound (1/2)
Check the L_MUTE,
SO_DEF line and their
peripheral parts.
Check IC501 and its
peripheral parts.
Check Q3901, Q3904,
Q3905 and their
peripheral parts.
Is output at pin (3) of
D3901 in "L" state?
Is output at pins (C16)
and (D16) of IC501
normal?
Check the line and its
peripheral parts.
No Sound from
headphone
Is input at pins (2) and
(3) of J3701 normal?
Check IC3301 and
its peripheral parts.
Check IC501, R_IN,
L_IN line and their
peripheral parts.
Muting effect is on.
Check the SP_Mute
line and its peripheral
No sound from
front speaker.
Is input at pin (9) of
IC3301 in "H" state?
Is output at pins (C17)
and (D17) of IC501
normal?
Is output at pins (2), (4),
(10) and (12) of IC3301
normal?
Check front speaker
and connection cable.
No Sound from
output line
Display
