Samsung TV Model LA26R71BA

[john_doe]

Hi,

My Samsung TV Model LA26R71BA has intermittent audio turn off for 5 seconds and then on again. This happens for about 10 minutes and then the audio is ok.

May I know which components should I check? I have already changed the caps.

I attach the power board.

Regards,
John

[tom66]

Re: Samsung TV Model LA26R71BA

Usually on these sets there is a separate 12V supply for audio and a 13V supply for other stuff. 12V supply uses a simple linear regulator and regulates the 13V supply. Check the 12V output. If it's bad, try new thermal paste on the regulator; if that fails, replace the regulator.

This is a close schematic for the 192B variant (you have 192A):


You can see 12V regulator ICM853.

[john_doe]

Re: Samsung TV Model LA26R71BA

The voltage output from ICM853 is 12.33vdc, same as the input voltage.

When there is no audio, the output voltage is still 12.33vdc.

Must I apply new thermal paste to ICM853? Or is there other components to check? Or should I replace ICM853?

[tom66]

Re: Samsung TV Model LA26R71BA

Ah, I had hoped that was your issue, but it is not. We would need to look at the main board next if the 12V is good. Part# on main board (BN96...?)

[john_doe]

Re: Samsung TV Model LA26R71BA

Thanks Tom66.

The main board is BN44-00192A.

[tom66]

Re: Samsung TV Model LA26R71BA

That's the power board; the main board is the board which takes the video inputs.

[john_doe]

Re: Samsung TV Model LA26R71BA

Oh. It is BN41-00933A.

[john_doe]

Re: Samsung TV Model LA26R71BA - Intermittent no sound

Hi,

Anyone has any suggestions?

[john_doe]

Re: Samsung TV Model LA26R71BA - Intermittent no audio

Hi,

Should I check on the power board or the main board for this intermittent no audio problem? Any suggestions will be appreciated.

[john_doe]

Re: Samsung TV Model LA26R71BA

Hi,

Just to give more info. When there is no audio, I also cannot adjust the volume or change the channel.

What could be the problem?

[john_doe]

Re: Samsung TV Model LA26R71BA

Hi,

Maybe this issue is not easy to advise as there is no more advice for many days.

I wish to thank all for reading this thread and advice given. Especially Tom66.

If I can find solution elsewhere I will update here so that others with the same issue can benefit too.

Thanks.

[tom66]

Re: Samsung TV Model LA26R71BA

Missed your post, sorry. If you cannot adjust the volume, try checking the headphone audio port is not contaminated. Also, check if you still have headphone audio during the fault.

[john_doe]

Re: Samsung TV Model LA26R71BA

There is no headphone jack. Is there an alternative?

[tom66]

Re: Samsung TV Model LA26R71BA

Is there an AUDIO OUT, either analog or digital?

[john_doe]

Re: Samsung TV Model LA26R71BA

There is audio out using RCA ports.

[tom66]

Re: Samsung TV Model LA26R71BA

You can hook that up to test - you could use an external amplifier, or an oscilloscope.

[john_doe]

Re: Samsung TV Model LA26R71BA

I use the Audio Out from RCA ports and the result is the same as the main speakers.

When there is no audio from the main speakers, the audio out RCA also has no audio and all controls are temporary frozen.

[tom66]

Re: Samsung TV Model LA26R71BA

Have you tried a complete service mode reset?
From standby: Mute 1 8 2 Power or Info Menu Mute Power on remote.
In the options menu, if you can see READY setting, try both ON and OFF modes.

[john_doe]

Re: Samsung TV Model LA26R71BA

Hi Tom66,

I tried - From standby: Mute 1 8 2 Power or Info Menu Mute Power on remote.
It is still the same and no audio.

I cannot find options menu. But if you mean menu option, there is no Ready setting.

[tom66]

Re: Samsung TV Model LA26R71BA

What do you see when you press those buttons on the remote after standby, any text on screen?