Sharp LC-26AF3 M/H/X Service Manual page 38

LC-26AF3 M/H/X
LC-32AF3 M/H/X
LC-37AF3 M/H/X
TROUBLE SHOOTING TABLE
o external audio input
signal which is sent signal which is sent from
SCART2
from SCART1
<EXT2>
<EXT1>
Is I 1-L audio signal sent from Is I 2-L audio signal sent from
pin (6) of SCART terminal (SC
pin (6) of SCART terminal (SC
1201) to pin (56) of IC2501 1200) to pin (53) of IC2501
(MSP)?
(MSP)?
Is I 1-R audio signal sent from Is I 2-R audio signal sent from
pin (2) of SCART terminal (SC pin (2) of SCART terminal (SC
1200) to pin (54) of IC2501?
1201) to pin (57) of IC2501?
YES NO
Check the
connection to pins
(6) and (2) of
SCART1 and to
external devices.
Is audio signal properly
sent from pins (28) and
(27) of IC2501?
Is audio signal properly
sent to pins (7) and (1) of
IC2504 (OP-AMP)?
Is audio output signal of
pin (4) of IC3901/IC3900
(MAI -AMP) normal?
Check the connector
P3900 and right and left
SP-BOX.
o sound (4) (from external input devices)
o external audio input o external audio input
signal which is sent from
EXT3
<EXT3>
Is I 3-L audio signal sent
from pin (3) of J1202 terminal
to pin (50) of IC2501?
Is I 3-R audio signal sent
from pin (5) of J1201 terminal
to pin (51) of IC2501?
YES
YES NO
Check the Check the
connection to pins connection to pins
(6) and (2) of (3) and (5) of EXT3
SCART2 and to (J1202 and J1201
external devices. respectively); and to
external devices.
Check IC2501 or
NO
peripheral circuits.
YES
Check IC2504 or
NO
peripheral circuits.
YES
Check IC3901/IC3900
NO
(MAI -AMP) or
peripheral circuits.
YES
(Continued)
o external audio input signal
which is sent from EXT4
(HDMI-A ALOG AUDIO)
<EXT4>
Is HDMI-L audio signal
sent from J1900 to pin
(3) of IC1906?
Is HDMI-R audio signal
sent from J1900 to pin
(7) of IC1906?
YES
NO
Is HDMI-L audio signal
sent to pin (47) of
IC2501?
Is HDMI-R audio signal
sent to pin (48) of
IC2501?
YES NO
Check output of pins
(15) and (11) of
IC1906, or
peripheral circuit.
38
o external audio input signal
which is sent from EXT4
(HDMI-DIGITAL AUDIO)
<EXT4>
Is HDMI-L audio signal
sent to pin (1) of
IC1906?
Is HDMI-R audio signal
sent to pin (6) of
IC1906?
YES NO
Check output of pins
(11) and (10) of
IC1905, and check
IC1904 (HDMI-
RECEIVER), HDMI
terminal (SC1900).