LC-32LE600E (serv.man7). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 10

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LC-32/40/46LE600E/RU/S
5 – 10
No sound of external device (3-1)-2
                                             
No audio output from EXT2 (SCART2) terminal.
                                             
Checklist:
1) Is the MUTE button on the remote control set to ON? 
•••• Set to OFF.
2) Check the connection to external devices. 
••• Is there any improper connection? 
                                             
Is audio signal output to pins (3) and (1) of EXT2 (SCART2) 
(SC502)?
YES
Check EXT2 (SCART2) (SC502) and the connection to an exter-
nal device.
NO
Is the SC2-MUTE signal of base (5) (2) pin of Q501 “H”?
NO
The Q501 base should usually be “L”.
If it is “H” signal, Check whether base of Q1301 is “L” or periph-
eral circuit.
 YES
Is the audio output signal (MONITOR_OUT_L/R) output from 
pins (19) and (20) of IC1302 (A-SW) normally? 
YES
Check whether there are problems in IC1302, Q503, Q504 and 
Q501 or peripheral circuits. 
NO
Isn't there problem in the power supply input (S9V, D3.3V) of 
IC1302 (A-SW), I2C_0 signal (SDA0/SCL0), and defective sol-
dering, etc.?
NO
Repair the faulty point around IC1302.
 YES
Where is the input source of the sound from?
(EXT1, EXT2, EXT3, EXT4, EXT8)
                                             
Check whether there is any problem in each input (terminal).
EXT1/2: SCART1/2
Check pin (44) (43)/(46) (45) of IC1302 and pin (6) (2) of EXT1/2 
terminal (SCART1/2).
EXT3: COMP
Check pin (48) (47) of IC1302, and pin (2) (4) of EXT3 terminal 
(J502).
EXT4: PC/HDMI
Check pin (50) (49) of IC1302, and pin (2) (3) of EXT4 terminal 
(J501).
EXT8: CVBS
Check pin (52) (51) of IC1302, and pin (5) (4) of EXT8 terminal 
(J505).

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