Samsung LT20A350 Service Manual page 51

4. Troubleshooting
4-1-9. No Sound
Symptom
- Video is normal but there is no sound..
- When the speaker connectors are disconnected or damaged.
Major
- When the sound processing part of the Main Board is not functioning.
checkpoints
- Speaker defect.
Diagnostics
7
Caution Make sure to disconnect the power before working on the IP board.
4-22
SMPS BOARD
Check the source and
check the connection of sound cable
(Comp/AV/PC/DVI to HDMI)?
Yes
Does the sound data appear at
PIN - COMP2_SR_IN,COMP2_SL_IN
VIA - PC_DVI_SR_IN, PC_DVI_SL_IN (PC/
DVI)?
Yes
Does the DC B12VS
appear at CN201 PIN 7,9 - B12VS_PW ?
Yes
Does the sound data appear at
TP - SPK_ L-, SPK_L+, SPK_R-, SPK_R+?
Yes
Replace speaker ?
MAIN BOARD
No
Input the sound source properly.
Check CN503, CN402.
No
Change the Main Assy.
No
Change the Main Assy.
Check IC1111 (X5).
No
Change the Main Assy.
No Please, Contact Tech support.