LG 37LC2DB (37LC2D?) sound issues

[Andy_Bee_1]

Hi there,

I bought a LG 37LC2DB off a local guy knowing it had a problem with the main board, in that it could not show Analog/Digital TV through the aerial. However AUX, SCART & HDMI worked fine. He had been using the TV fine for Satellite & XBox.
This was no problem for me as I live in an area which cannot receive TV through an aerial anyway.
I installed the TV, plugged in the Cable box, Wii and Media Centre.
Everything was fine, for a while....
After about 20mins the sound started making VERY loud crackle & pop noises, then would die. Turning the TV off then on did not get the sound back, but if left for a couple of hours it would be fine again.
A month on and this loss of sound is random, it can be after 2mins, or other times we can watch the TV all day without sound loss.

Investigation:
I took the back off and checked for signs of badcaps - Nothing obvious!
I went on some TV spare parts websites, spoke to a few people and bought both mainboards and replaced them as recommended. Everything worked still, then after 15mins the sound died (but with no pop & crackle this time, just muted). Over weeks this pop & crackle before the muting has returned.
As far as I can see it hasn't got anything to do with the other boards in the TV - inverter, LCD controller, buttons, side panel etc.

Shall I just buy the caps for the PSU? Is this likely to be the problem? All symptoms of a bad PSU seem to degrade or kill the picture - picture is crystal clear on my TV.

Any help gratefully appreciated :-)

[retiredcaps]

Re: LG 37LC2DB (37LC2D?) sound issues

Any help gratefully appreciated :-)

Pay close attention to the picture composition that PlainBill wants and PLEASE do NOT post pictures inline or offsite. See

https://www.badcaps.net/forum/showpo...76&postcount=2

[tom66]

Re: LG 37LC2DB (37LC2D?) sound issues

This is caused by the capacitors on the 19V and/or 12V rail failing. They do not have to bulge to be failed and many Samwha capacitors that LG seems so fond of using are known to fail without bulging.

Post a picture of the power supply - top and bottom - clear and focused around the capacitors and the power supply connectors.

[Andy_Bee_1]

Re: LG 37LC2DB (37LC2D?) sound issues

Thank you, I shall indeed take some photos and post them (hosting on this site)

[huggy25]

Re: LG 37LC2DB (37LC2D?) sound issues

This is caused by the capacitors on the 19V and/or 12V rail failing. They do not have to bulge to be failed and many Samwha capacitors that LG seems so fond of using are known to fail without bulging.

Post a picture of the power supply - top and bottom - clear and focused around the capacitors and the power supply connectors.

Tom 66...... I have an LG37LC2DB television. Basically I would like to know if I could bring it to you to have a look at for me as it has a problem similar to Andy Bee 1
where it will be ok for a while then it starts making loud crackling and pop noises and I lose the picture and it will not respond to the remote control.
Thanks in advance.

[tom66]

Re: LG 37LC2DB (37LC2D?) sound issues

Tom 66...... I have an LG37LC2DB television. Basically I would like to know if I could bring it to you to have a look at for me as it has a problem similar to Andy Bee 1
where it will be ok for a while then it starts making loud crackling and pop noises and I lose the picture and it will not respond to the remote control.
Thanks in advance.

I don't really do TV repairs for people, as I don't have the time (just a student.) All I can suggest is you replace the mentioned capacitors; better yet, replace ALL of them, as they will fail eventually (Samwha are bad capacitors.)