Bizarre behaviour Hisense - 42 inch LCD

[Grogamanda]

Hi all....

This may seem odd but the other day, my daughters TV stopped working and began emitting a high pitched whine...and nothing else.

So, I thought, lets open her up and see what we can see.....Took the back off...checked the Caps etc. nothing. Plugged it in - worked perfectly!

reinstalled the backpanel, reinstalled wall bracket, checked it again before I put it on the wall....All good!

Put it on the wall, High pitched whine and nothing else.

Took it off the wall, plugged it in again in my work room - Worked perfectly.

Took it back into daughters room - plugged it in before hanging it - worked perfectly....

Hung it on the wall.....High pitched whine....Bizzare...I think it might be a dry solder joint thats getting stressed when I hang it....

Any thoughts at all??

Cheers in advance...

Richard

[tw2005]

Re: Bizarre behaviour Hisense - 42 inch LCD

Hi all....

This may seem odd but the other day, my daughters TV stopped working and began emitting a high pitched whine...and nothing else.

So, I thought, lets open her up and see what we can see.....Took the back off...checked the Caps etc. nothing. Plugged it in - worked perfectly!

reinstalled the backpanel, reinstalled wall bracket, checked it again before I put it on the wall....All good!

Put it on the wall, High pitched whine and nothing else.

Took it off the wall, plugged it in again in my work room - Worked perfectly.

Took it back into daughters room - plugged it in before hanging it - worked perfectly....

Hung it on the wall.....High pitched whine....Bizzare...I think it might be a dry solder joint thats getting stressed when I hang it....

Any thoughts at all??

Cheers in advance...

Richard

could very well be or something may be pinching. I have read a similar story, no idea when , brand or model so have no idea what key word to do a search.

Is it possible to leave the back off, then mount and hang and see what flexes?

[Alastair E]

Re: Bizarre behaviour Hisense - 42 inch LCD

Mounting screws too long, touching and shorting something....?

[tw2005]

Re: Bizarre behaviour Hisense - 42 inch LCD

Mounting screws too long, touching and shorting something....?

Good point!

[Grogamanda]

Re: Bizarre behaviour Hisense - 42 inch LCD

WOW - Fast responses!

Mounting screws too long, touching and shorting something....?

Unfortunately, that was the first thing I checked....The upper ones have
10 mm clearance and the bottom ones are actually in the backpanel....and contained....so not touching...

The thing is, it works with the bolts in when its on the floor lol.

Cheers

Richard

[Agent24]

Re: Bizarre behaviour Hisense - 42 inch LCD

If it works when lying down, perhaps it's a bad solder joint somewhere and when mounted vertically the weight of the component causes it to disconnect.. Check the power supply for bad solder joints.

[Shinju]

Re: Bizarre behaviour Hisense - 42 inch LCD

Sounds like a wire being pinched some place, I had a Sammy 5084 that would work perfect on a stand, put it on the wall mount and it wouldn't turn on all all.

Come to find out there was a wire being pinched between the back shell and the bottom of the panel itself. It came from the factory like this.

Take the back off and start hunting!


Also I repaired a 2013 JVC LED that had the same issue, from the factory there was a wire harness being smashed by the back shell on the wall mount bolt frame.