Old Samsung tv audio cuts out after a few minutes

by Tridox Jul 19, 2018 9:31PM PDT

I have a 46" LCD tv from 2008 (LN46A550P3F)

Audio works fine using rca plugs or component plugs, but when I try to use HDMI it will work for a few minutes, but then it will cut out and spasm every once in awhile (popping noises or random loud screech). When this happens no audio will work, soundbar tv or headphones, until the tv sits off for a little bit. I've tried settings, research, and all of that.

Im good with electronics, so if I can find the bad part I can fix it, I just don't even know what to look for. It's odd that it works fine with everything else except HDMI.

Anyone have any knowledge they could throw at me?

Discussion is locked

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Also

by Tridox Jul 19, 2018 9:38PM PDT

When the sound cuts out, even if the volume is set to zero, the speakers still wig out and make loud random noise.

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A few free things to try.

by r. proffitt Forum moderator Jul 20, 2018 7:47AM PDT

1. Open it up and get out the canned air (all notes about Tech Safety are on the web) to clean heatsinks and vents.

2. Re-test. If it fails, see if the firmware is the last offered. Remember I don't tell folk how to do this. It's only from Samsung.

3. Now it may cost. Try a new mainboard.

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Figured it out

by Tridox Jul 20, 2018 12:16PM PDT

Funny story. I got looking at the main board again and looked up a new one. I then noticed a giant heat sink on the new one that wasn't present on the old one, so sure enough, when I placed a fan where the heat sink was it fixed it. I bought this used, no idea who thought it was a good idea to remove that...

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Cool find.

by r. proffitt Forum moderator Jul 20, 2018 12:30PM PDT

Story matters. I would not have guessed a missing part. Most folk never get inside the TV.

Old Samsung tv audio cuts out after a few minutes

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