Samsung UE49K5502AK - No Sound

No sound 
Diagnostics
Check the source & sound cable.
(Comp/PC/DVI to HDMI)
No
Input a Sound source.
Yes
Check Selftest
(Support > Self Diagnosis > Picture Test)
Remain other Problem?
No
Check for connecting external device.
Yes
Check the DC B13V to Q201.
No
Change the Main Assy.
Yes
Check the sound data.
- L-, L+, R-, R+
No
Check the IC902 (HAWK_MF)
/ IC401 (Sound AMP).
Change the Main Assy.
Yes
Change the speaker
Location of Parts 
Main Board_Front
Q201
IC401
4-10
4. Troubleshooting