Samsung LN-S4051D no sound

[tmhobadcap]

My friend asked me to help with fixing his TV with no sound. But I only have very limited electronic knowledge. Therefore, I need you to help.

There is picture but just no sound from the tv. I have checked that it is not the source or input problem. I have checked that the TV speakers are okay.

On the power board, the top left corner capacitor (CM808) is with a bulged top. It is 25V, 1000 micro faraday. I then replaced it with a 35V, 1000 micro faraday because that is just the closest value I have, and I guess it is okay to do so.

I got all the voltages as marked on the power board. Therefore, I think it is the mainboard with problem. But with my limited knowledge, and there is no visible damage on the board, I have no clue on which component may have problem causing no sound. Please help.

[nomoresonys]

Re: Samsung LN-S4051D no sound

if you have not already, try unplug tv for 10 minutes, hold power button in on tv not remote for 30 seconds, plug tv back in and try it, can check in menu and make sure external speakers are not selected, so sound settings, internal mute set to off.

[nomoresonys]

Re: Samsung LN-S4051D no sound

can try factory reset, with tv off, hit mute-1-8-2-power, see if service menu comes on, go to reset and select, do NOT select anything else, you can really mess up a tv by choosing the wrong thing in service menu. if that one dont work try info-menu-mute-power.

[kasfamily]

Re: Samsung LN-S4051D no sound

You checked whether there is sound in the headphones?

[nomoresonys]

Re: Samsung LN-S4051D no sound

can also plug and unplug the 3.5 headphone jack or any 3.5 male end several times, see if that helps.

[ivtec]

Re: Samsung LN-S4051D no sound

My friend asked me to help with fixing his TV with no sound. But I only have very limited electronic knowledge. Therefore, I need you to help.

There is picture but just no sound from the tv. I have checked that it is not the source or input problem. I have checked that the TV speakers are okay.

On the power board, the top left corner capacitor (CM808) is with a bulged top. It is 25V, 1000 micro faraday. I then replaced it with a 35V, 1000 micro faraday because that is just the closest value I have, and I guess it is okay to do so.

I got all the voltages as marked on the power board. Therefore, I think it is the mainboard with problem. But with my limited knowledge, and there is no visible damage on the board, I have no clue on which component may have problem causing no sound. Please help.

Not to exclude Hdmi cable ,Hdmi Switch on the main board? a way to check is if component audio in is ok or coaxial input tuner has audio ;hope you you know enough to make these checks, before assuming mainboard bad.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

You checked whether there is sound in the headphones?

Thanks for your suggestion.
There is no sound from the headphone port.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

if you have not already, try unplug tv for 10 minutes, hold power button in on tv not remote for 30 seconds, plug tv back in and try it, can check in menu and make sure external speakers are not selected, so sound settings, internal mute set to off.

Thanks for your suggestion.
I have just tried it and reset it. Still there is no sound.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

can try factory reset, with tv off, hit mute-1-8-2-power, see if service menu comes on, go to reset and select, do NOT select anything else, you can really mess up a tv by choosing the wrong thing in service menu. if that one dont work try info-menu-mute-power.

I have just done the factory reset according to your suggestion. Still there is no sound.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

can also plug and unplug the 3.5 headphone jack or any 3.5 male end several times, see if that helps.

I have just plugged and unplugged the headphone jack several times. But still no sound.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

Not to exclude Hdmi cable ,Hdmi Switch on the main board? a way to check is if component audio in is ok or coaxial input tuner has audio ;hope you you know enough to make these checks, before assuming mainboard bad.

Thanks for your suggestions.
I have just used an antenna as the input to it. But still I have picture but no sound.
Sorry, I forgot where I put my component cable and so I cannot check if the component input will have sound or not. Once I found it, I will try and report back.
Sorry, I do not understand your first sentence. I use Hdmi cable for my test and I have tried the two hdmi ports on the mainboard. Both have no sound.

[edugimeno]

Re: Samsung LN-S4051D no sound

You need to find the schematic for the main board (did I read bn97-00828A?)
Then you need to see how the sound signal travels thru the whole board, probably getting out of the main video processor IC, going thru amplifiers, mux/demuxers, probably more amplifiers and then to the earphone and the loudspeakers.

Have your TV set ON with a reasonable sound volume set.

Find exposed component leads on those stages and using a small earphone, connect GND from earphone to ground, and another lead (L or R) from the earphone to one needle and start touching those areas in the schematic going from start to end points I mentioned before, you should be hearing sound, very very low at first stages and increasing volume at later stages

See what you can with this

[R_J]

Re: Samsung LN-S4051D no sound

The information in post 12 will not work as the audio is digital going into the main audio output ic401.
Do you have an audio amp/receiver with audio input? if you do try connecting the audio out jacks to the amp or if it has an optical input try connecting the optical out from the tv to the amp, IC302 does the audio processing and outputs low level to the audio output rca jacks as well as spdif audio out. It also sends audio to the headphone amp ic303 which should give audio out to the headphones
Check the "Sound" menu to see if audio is not in internal mute mode muting the internal speakers.
Also go to "Sound" Melody and turn it ON and see if it plays audio when the tv is turned on or off.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

The information in post 12 will not work as the audio is digital going into the main audio output ic401.
Do you have an audio amp/receiver with audio input? if you do try connecting the audio out jacks to the amp or if it has an optical input try connecting the optical out from the tv to the amp, IC302 does the audio processing and outputs low level to the audio output rca jacks as well as spdif audio out. It also sends audio to the headphone amp ic303 which should give audio out to the headphones
Check the "Sound" menu to see if audio is not in internal mute mode muting the internal speakers.
Also go to "Sound" Melody and turn it ON and see if it plays audio when the tv is turned on or off.

Thanks for your comments.

I have tried with the audio out jacks. I got audio from the right channel only. At this time (with audio out jacks plugged in), then the earphone jack will have noise.

I tried with the optical jack as well. There is no audio from it. (From the menu of the tv, there is no setting for choosing the optical audio. But from my own tv, there is such setting).

For the "Sound" menu, I have already set the internal mute mode to off.

For the "Sound" Melody, I have already set it to ON, but there is no audio when the tv is turned on or off, even when I use the audio out jack and got sound from the right channel.

Any further comments or suggestions for me?

[R_J]

Re: Samsung LN-S4051D no sound

Do you have the service manual? IC302 process the audio so it seems to be passing ANY_SR_OUT, the reason there is no left audio could be due to your source. You should be getting headphone audio, but it might be muted, you would need to check the voltages on ic303 or Q303
To trace faults like this you need the proper equipment like a scope, without it your best bet is to replace the board.

I believe the melody is only played through the tv speakers, I have never checked if it plays through the aux out. Since all the switching is digitally controlled, it may even be a firmware issue.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

Do you have the service manual? IC302 process the audio so it seems to be passing ANY_SR_OUT, the reason there is no left audio could be due to your source. You should be getting headphone audio, but it might be muted, you would need to check the voltages on ic303 or Q303
To trace faults like this you need the proper equipment like a scope, without it your best bet is to replace the board.

I believe the melody is only played through the tv speakers, I have never checked if it plays through the aux out. Since all the switching is digitally controlled, it may even be a firmware issue.

I do not have the service manual. I do not have a scope and I also do not know how to use it. If there is no other ways for me, do you suggest me to try reflowing IC302? (I have a heat gun and have some experience in reflowing IC).

[R_J]

Re: Samsung LN-S4051D no sound

I doubt reflowing the ic connections would do anything, here is the complete manual

[tmhobadcap]

Re: Samsung LN-S4051D no sound

I doubt reflowing the ic connections would do anything, here is the complete manual

Thanks a lot!

[nomoresonys]

Re: Samsung LN-S4051D no sound

I would go ahead and try that reflow, I've seen it work before, just try to monitor the temperature, dont want to burn it up.

[tmhobadcap]

Re: Samsung LN-S4051D no sound

I have tried reflowing ic302, but still no luck.
Thank you for everybody's suggestions and comments.