No Sound (X4) - Samsung LA22C450E1 Service Manual

4-1-7. No Sound (X4)

Symptom Video is normal but there is no sound..
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When the speaker connectors are disconnected or damaged.
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Major
When the sound processing part of the Main Board is not functioning.
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checkpoints
Speaker defect..
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Diagnostics
Caution Make sure to disconnect the power before working on the IP board.
Check the source and check the connection of
sound cable (Comp/PC/DVI to HDMI) ?
Yes
Does the sound data appear at TP - COMP1_AV1_SL_
IN, COMP1_AV1_SR_IN (AV1, COMP1)
TP - COMP2_SL, COMP2_SR (Comp2)
TP - SIDE_AV_AV2_SL_IN, SIDE_AV_AV2_SR_IN(AV2)
TP - PC_DVI_SL_IN, PC_DVI_SR_IN (PC/DVI) ?
Yes
Does the DC B3.3V, B13V
appear at TP - B3.3V, B13V?
Yes
Replace speaker?
No
Input the video source properly.
Check CN1101, CN1107_N22
No
(CN1107_22), CN1203.
Change the Main Assy.
Check IC3002 (X4).
No
Change the Main Assy.
No Please, Contact Tech support.
4. Troubleshooting
4-25