TV won't turn on high pitched noise from power supply board

[budm]

Re: TV won't turn on high pitched noise from power supply board

What is your TV exact model number?

[WildPuppy]

Re: TV won't turn on high pitched noise from power supply board

.
(EDIT: sorry, jumped the gun here. My bad.)

[freakaftr8]

Re: TV won't turn on high pitched noise from power supply board

That board attached to the power supply is the LED driver circuit for the local dimming array system. Most likely putting the board into a TV with a bigger panel requires more current.

[budm]

Re: TV won't turn on high pitched noise from power supply board

He indicated that the noise if from this board:
https://www.badcaps.net/forum/showthread.php?t=64328

[apd_jack]

Re: TV won't turn on high pitched noise from power supply board

That board attached to the power supply is the LED driver circuit for the local dimming array system. Most likely putting the board into a TV with a bigger panel requires more current.

Yes, it is they called "intelligence sensor", but why the sound is coming out from there?
Actually, it's a smaller panel for mainboard, but yeah, it is suppose to be smth about current insufficiency.
Is there any way to be sure whichever is the source of the issue?


@budm Its model: LG 47LX6900

Mainboard came from 55LX6900

[budm]

Re: TV won't turn on high pitched noise from power supply board

Hmm, shopjimmy has no info for that model for me to find out what are on that board. I can see one part, BU1, so can you push on the inductor with plastic or wooden stick to see if the noise will change?
https://www.badcaps.net/forum/attach...1&d=1523494009

[apd_jack]

Re: TV won't turn on high pitched noise from power supply board

Hmm, shopjimmy has no info for that model for me to find out what are on that board. I can see one part, BU1, so can you push on the inductor with plastic or wooden stick to see if the noise will change?
https://www.badcaps.net/forum/attach...1&d=1523494009

Yes, i did and it turned out that sound directly coming from that sucker
From its tiny hole (you can see in the picture)
When i pushed other capacitors on this board, sound also changed.

What do you think it can be?

[apd_jack]

Re: TV won't turn on high pitched noise from power supply board

That board attached to the power supply is the LED driver circuit for the local dimming array system. Most likely putting the board into a TV with a bigger panel requires more current.

Hi freakaftr8,
Do you have any idea now?

Tnx

[freakaftr8]

Re: TV won't turn on high pitched noise from power supply board

It could be caused by resonance in a coil. I would attempt to resoolder all coils and resolder BU1 to see if it helps.