Sharp LC-20SH1E (serv.man8) Service Manual ▷ View online
17
LC-20SH1E
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.
18
LC-20SH1E
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
19
LC-20SH1E
TROUBLE SHOOTING TABLE
(Continued)
No
No
No
Yes
Yes
No Sound (2/2)
TV sound failure
SCART sound failure
No sound from SCART
Check IC501 and its
peripheral parts.
Is output at pins (E23)
and (F25) of IC501
normal?
Check Q3902, Q3903,
Q3906, Q3907 and their
peripheral parts.
Check the SC_L,
SC_R line and their
peripheral parts.
Is input at pins (F24)
and (F25) of IC501
normal?
Check SF202 and its
peripheral parts.
Is input/output of
SF202 normal?
Check IC501 and its
peripheral parts.
19
LC-20SH1E
TROUBLE SHOOTING TABLE
(Continued)
No
No
No
Yes
Yes
No Sound (2/2)
TV sound failure
SCART sound failure
No sound from SCART
Check IC501 and its
peripheral parts.
Is output at pins (E23)
and (F25) of IC501
normal?
Check Q3902, Q3903,
Q3906, Q3907 and their
peripheral parts.
Check the SC_L,
SC_R line and their
peripheral parts.
Is input at pins (F24)
and (F25) of IC501
normal?
Check SF202 and its
peripheral parts.
Is input/output of
SF202 normal?
Check IC501 and its
peripheral parts.
Display
