Samsung UN40D5500RF - No Sound

4-22
4. Troubleshooting
No Sound 
Symptom Video is normal but there is no sound.. -
Major
checkpoints
When the speaker connectors are disconnected or damaged. -
When the sound processing part of the Main Board is not functioning. -
Speaker defect.. -
Diagnostics
Main Assy
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
Power Assy
1 B5V 2 SW_PW
3 B5V 4 A5V
5 GND 6 GND
7 B12VS 8 GND
9 B12VS 10 SW_INV
11 B13V 12 NC
13 B13V 14 DMM
Main Ass’y
14p cable
Speaker
Power Ass’y
LVDS cable
T-con
Does the sound data appear at
R524/R525 (AV1, COMP1)
R419/R420 (PC/DVI) ?
Does the sound data appear at
- L-, L+, R-, R+ ?
Does the DC B13V
appear at BD209 ?
Yes
Yes
Yes
Yes
Input the sound source properly.
Please, Contact Tech support.
Check CN504,CN402
Change the Main Assy.
Check IC1001 (X5)
Check IC301 (Sound AMP)
Change the Main Assy.
Change the Main Assy.
No
No
No
No
No
Check the source and check the connection of
sound cable (Comp/PC/DVI to HDMI) ?
Replace speaker ?

Yes
Check external devices and
connections.
No
check the Self Diagnosis
(SupportSelf DiagnosisPicture Test)
Dose the promblem still exist self diagnosis ?
Caution Make sure to disconnect the power before working on the IP board.