Sharp LC-32WD1E/S/RU Service Manual page 52

LC-32WD1E/S/RU, LC-37WD1E/S/RU, LC-42WD1E/S/RU, and LC-32/37/42WT1E
No audio output during UHF/VHF reception
Is the set unmuted?
yes
Is the volume set to "50"
yes
Are headphones disconnected from the set?
yes
Is the antenna properly connected?
yes
Is audio signal sent from D013 (TDA15134)?
Check R0155 and R0158
yes
Is audio signal sent from D020 (TDA8932)?
Check D020-27/30 and D020-19/22
yes
Is audio signal on X022 and X021 normal
yes
Check speakers and wiring
press the "mute" on the remote
no
press the "volume up" on the remote
no until volume is "50"
remove the headphones plug from the set
no
Connect according to manual
no
Is the audio signal (SIF) sent to D013
no Check Z010-4 and Z010-5
no
Is the audio signal (SIF) sent from the Tuner U011?
Check U011-8
no
Check 5V_tuner, AGC and I2C signals
Fixed?
no
Replace tuner
Check +28V_audio and other D020 circuitery
no
Check connectors
no
6-21
Check +8V_TV(C019) and +5V_TV(C01113)
yes and periferal circuit
Check circuitery of SAW filters (Z010 and
yes Z011)