LC-32SD1E (serv.man8). Troubleshooting Table - Sharp TV Service Manual (repair manual). Page 5

LC-26SD1E/RU, LC-32SD1E/RU

6 – 5

                                             
No sound from EXT5 (AUDIO) connecting an external input 
device.

                                             
<EXT5>
Is HDMI-L audio signal sent from J2701 to pin (14) of IC2704?
Is HDMI-R audio signal sent from J2701 to pin (5) of IC2704? 

YES

Is HDMI-L audio signal sent to pin (10) of IC3002? 
Is HDMI-R audio signal sent to pin (9) of IC3002?

NO

Check output of pins (13) and (3) of IC2704 and peripheral 
circuits. 

YES

Check that Option-HDMI Setup-Audio select is set to “Analog”.

                                            

OK

Is the audio signal properly sent from pins (28) and (27) of 
IC3002?

NO

Check IC3002 or peripheral circuits.

YES

Is the audio signal of pins (1) and (7) of IC303 (OP-AMP) sent 
properly?

NO

Check IC303 or peripheral circuits.

YES

Is the audio output signal of pins (13) and (16) of IC302/IC301 
(MAIN-AMP) normal?

NO

Check IC302/IC301 (MAIN-AMP), HEADPHONE and peripheral 
circuits.

YES

Check CONNECTOR (P301) and Speaker (right and left).

                                             
No audio output from the headphones.

                                             
Is there audio output on pins (2) and (3) of the headphone 
terminal (J1301)?

NO

Is audio input/output signal of pins (3) and (5)/(1) and (7) of IC303 
(OP-AMP) normal? 

NO

Is audio output signal (SPK-OUT L/R) properly sent from pins 
(28) and (27) of IC3002 (VCT)?

NO

Check audio input signal of pin (31) of IC3002 (VCT), pins (18) 
and (33) of the power line, pins (84) and (83) of I2C-LINE, and 
peripheral circuits.