LG 32LC7D no sound

[CR Designs]

Picked up this TV it was dead . Opened it up it had 5 blown capacitors. Replaced capacitors TV works great good picture, but has no sound. Hope someone can help on this tv, Thanks .For your info I tried it with a DVD player same result no sound good picture

[tom66]

Re: LG 32LC7D no sound

Does headphone audio work?

[CR Designs]

Re: LG 32LC7D no sound

Does headphone audio work?

I can't find a plugin for headphone

[tom66]

Re: LG 32LC7D no sound

Usually on the side of these sets, near the additional video inputs.

Also, in the user menu, check the TV Speaker setting is set to "ON".

[CR Designs]

Re: LG 32LC7D no sound

Usually on the side of these sets, near the additional video inputs.

Also, in the user menu, check the TV Speaker setting is set to "ON".

I had already checked the speaker setting It was set to off. I had changed it to on. It still got no sound. As for the headphone .I have looked every where I don't see one. The sides of the tv have buttons on one side and RCA on the other side.

[tom66]

Re: LG 32LC7D no sound

OK, on the speaker connectors, can you unplug one speaker and see if you get sound out of one channel (repeat for the other connector.) If you get some sound out with one speaker disconnected, it indicates there is a short in the wire assembly somewhere or the speaker is shorted.

Also, try a factory reset: hold MENU on side button, MENU on remote for 10 seconds. Then select RESET option from menu.

You will need an oscilloscope to do detailed audio circuit tracing to locate where a fault may be.

[CR Designs]

Re: LG 32LC7D no sound

OK, on the speaker connectors, can you unplug one speaker and see if you get sound out of one channel (repeat for the other connector.) If you get some sound out with one speaker disconnected, it indicates there is a short in the wire assembly somewhere or the speaker is shorted.

Also, try a factory reset: hold MENU on side button, MENU on remote for 10 seconds. Then select RESET option from menu.

You will need an oscilloscope to do detailed audio circuit tracing to locate where a fault may be.

Checked speakers still no sound. held down menu could not get reset got another menu in-start. Also went to menu to audio settings and found setting front surround is set to off. but I cannot switch it to on.

[tom66]

Re: LG 32LC7D no sound

May have to see if there is an alternate service menu entry option, might be different for US TV.

[CR Designs]

Re: LG 32LC7D no sound

May have to see if there is an alternate service menu entry option, might be different for US TV.

There's a service plug on back of tv.any more ideas ? would a new main board solve this sound problem ?

[CR Designs]

Re: LG 32LC7D no sound

There's a service plug on back of tv.any more ideas ? would a new main board solve this sound problem ?

Any one want to chime in on this matter that may know the answer, Thanks

[CR Designs]

Re: LG 32LC7D no sound

Any one want to chime in on this matter that may know the answer, Thanks

any help ?

[truep]

Re: LG 32LC7D no sound

Can you get audio from an optical or RCA output into a receiver?

[CR Designs]

Re: LG 32LC7D no sound

Can you get audio from an optical or RCA output into a receiver?

don't have a outside receiver to test it on. I talked to the guy I got it from he said it had sound before it went dead

[CR Designs]

Re: LG 32LC7D no sound

don't have a outside receiver to test it on. I talked to the guy I got it from he said it had sound before it went dead

I tested the voltage on the PSB

3.4v- 2.41v
6v-5.98
12v-11.96
19v- 19.0

The only voltage that didn't look right is the 3.4v it was 2.41v could this be a problem?

[tom66]

Re: LG 32LC7D no sound

Yes, easily. It's a common problem on this model. On the bottom of the PSU you will find an 8pin IC marked IRU3037. Actually two of them. Replace both of these. One does 6V and one does 3.4V. I've only ever seen the 3.4V fail but I wouldn't rule out 6V failure. In addition I'd recommend replacing 3.4V & 6V rail caps as they can fail, unlikely to cause this but a good precaution.

[CR Designs]

Re: LG 32LC7D no sound

Yes, easily. It's a common problem on this model. On the bottom of the PSU you will find an 8pin IC marked IRU3037. Actually two of them. Replace both of these. One does 6V and one does 3.4V. I've only ever seen the 3.4V fail but I wouldn't rule out 6V failure. In addition I'd recommend replacing 3.4V & 6V rail caps as they can fail, unlikely to cause this but a good precaution.

Tom66, I can't find the ic's you are referring to at the bottom of the PSU. I have replaced all the caps except for the 2 470uf caps .I have posted a picture of the PSU

[tom66]

Re: LG 32LC7D no sound

Bottom = green side, not lower side of power board, sorry for not clarifying.

[CR Designs]

Re: LG 32LC7D no sound

Bottom = green side, not lower side of power board, sorry for not clarifying.

Thanks tom66 for the help, where can I get the IC,s ?

[CR Designs]

Re: LG 32LC7D no sound

Bottom = green side, not lower side of power board, sorry for not clarifying.

Tom66 can you point out the 2 IC'S you said to replace,Thanks I posted a picture of the board

[mikoz]

Re: LG 32LC7D no sound

Sorry can't read the IC's but have squared 5 out for you to check for Tom66's suggestion. RU3037