TITLE
Service Manual
LCD TV For 237-T11
Doc No.
SM_237-T11_19Nov07
Version
1.2
Page
17/72
Company Confidential-DRAFT
4-5 Audio Abnormal Output
Audio Problems
Can’t adjustment
Volume
Replace Keypad
board
Replace speaker
module
No audio on one
side of speaker
Fail
OK
Replace connect
wire
Fail
Replace System
board
Fail
No audio
Check switches on the
keypad board
OK
Set the speaker
setting to off
Fail
OK
1.
Secure earphone
connection.
2.
Replace Earphone
cable
Replace System
board
OK
Fail
Fail
No audio through
earphone
Test
Trouble Condition
Check Item
Replace Material
Test
Step2
：
Check OSD speaker
setting is off and not
on
Step1
：
1.
Check earphone
connection
2.
Check earphone
cable
Step3
：
Check System board
component J21 & Q12
for a short
Step1
：
Check for loose
connection between
CN3 and peaker and
CN4 and speaker
Step2
：
Check if the Speaker
module is broken
Step3
：
Check System board
CN2-pin1 to ground =
2V
Fail
Make sure external audio
connection is secure
before proceeding with
troubleshooting
Finish
