LC-32GD9EK (serv.man10). Troubleshooting Tables - Sharp TV Service Manual (repair manual). Page 7

Check power supply and pins (9) and (10)of IC2704(SW) and 
audio signal input of pins (4) and (11) of IC2704.

Check Q4601... Q4607 and their peripheral circuits.

Check R272 and R273.

Are scrambled images not displayed?

DIGITAL UNIT:
Is audio signal fed to pins (5) and (10) of IC4604 (OP-AMP)?

Are video signals (R/G/B,CVBS) send from the 
C4636/C4637/C4638 and emitters of Q4607?

Check power supply and pin (1) of IC2705(SW).

MAIN UNIT:
Is video signal (CVBS) sent from pin (2) of IC2705(SW).

Are video signals (R/G/B,CVBS) fed from pins (179),(180),(181) 
and (184) of IC3002?

MAIN UNIT:
Is audio signal sent to pin (3) and (13) of IC2704 (SW)?

Is audio signal sent from pins (7) and (8) of IC4604(OP-AMP)?

Check R4002(AD2pin) and IC4001(D-Processor).

Check power supply of IC4604(OP-AMP) and its peripheral circuits.

D-TUNER UNIT:
Is data FED[0:7] sent from pins (3),(4),(5),(6),(8),(9),(10) and (11) 
of P202?

DIGITAL UNIT:
Check 5V output of pin (1) of IC4702.
Check 5V of pin (6) of Q4401.

Check R4011(AC8pin),R4013(AC9pin) and IC4001(D-Processor).

DIGITAL UNIT:
Are video signals (R/G/B,CVBS) sent from 
C4639/C4640/C4641/C4625?

No sound from an external 
input device connected to 
EXT1 (SCART1).

No sound from an external 
input device connected to 
EXT2 (SCART2).

No sound from an 
external input device 
connected to EXT3.

No sound from EXT4 
(AUDIO) connecting an 
external input device.

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

<EXT1>
Is IN1-L audio signal sent 
from pin (6) of SCART1 
terminal (J1101) to pin 
(14) of IC3002 (VCT)?
Is IN1-R audio signal sent 
from pin (2) of SCART1 
terminal (J1101) to pin 
(13) of IC3002 (VCT)?

<EXT2>
Is IN2-L audio signal sent 
from pin (27) of SCART2 
terminal (J1101) to pin 
(12) of IC3002 (VCT)?
Is IN2-R audio signal sent 
from pin (23) of SCART2 
terminal (J1101) to pin 
(11) of IC3002 (VCT)?

<EXT3>
Is IN3-L audio signal 
sent from pin (3) of 
J1201 terminal to pin 
(16) of IC3002?
Is IN3-R audio signal 
sent from pin (5) of 
J1201 terminal to pin 
(15) of IC3002?

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

Check IC3002 or 
peripheral circuits.

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

Check IC303 or 
peripheral circuits.

<EXT4>
Is D-SUB-L audio signal 
sent from J2702 to pin 
(15) of IC2704?
Is D-SUB-R audio signal 
sent from J2702 to pin 
(2) of IC2704?

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

<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?

Check pins (6) and 
(2) of SCART1 and 
connection to an 
external input 
device.

Check pins (27) and 
(23) of SCART2 and 
connection to an 
external input 
device.

Check pins 3 
(J1201) and 5 
(J1201) of EXT3 
and connection to 
an external input 
device.

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

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

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

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

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

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