New sharp aquos making extreamly faint humming noise when on that changes pitch with picture

[steppinthrax]

I got that circuit city sharp aquos 42" 720p display.

I watched crank last night (2 hours or so) full brightness. I think it was the longest I had it on. I went up to the display to turn it off and noticed a very very faint hum (low pitch). I thought it was comming though the speakers. I muted and could hear it if I put my ear in the back right were the cables plug into. You can't hear it being a distance away from the unit even when mute is on.

I let the set off and cool down. I came back up and turned it on and noticed the noise wasen't there. I guess it comes when it's heated. Not sure.

Is there a break in period for the backlight /display?????

 

[steppinthrax]

I just did some reading and notice they have something called a break-in DVD for LCDs and Plasmas. They said you should run it for 150 hours....

 

[alfa147x]

Do you know were I could find this?

 

[steppinthrax]

Originally posted by: alfa147x
Do you know were I could find this?

http://www.eaprogramming.com/

I didn't see anything in my manual about leaving the TV on for 100 hours or so???? But others say it's in their manual.

 

[SlickSnake]

Interesting. My 46" Aquos don't make a sound. Only a relay that clicks when it goes on or off. The back light is powered just like a regular florescent light would be, and sometimes those transformers hum a little bit. I doubt it is cause for concern, and since normally you have the volume turned up, you wouldn't notice it anyway. Some of the cheaper brands like Scepters make so much racket from the cheap transformers in the back lighting people will take them back, hehe.

 

[SlickSnake]

Originally posted by: steppinthrax

Originally posted by: alfa147x
Do you know were I could find this?

http://www.eaprogramming.com/

I didn't see anything in my manual about leaving the TV on for 100 hours or so???? But others say it's in their manual.

It's not in my manual. And I wouldn't personally recommend it. Even my 24 hour Walmart has a period they turn off all their TVs and LCD displays at night, both the ones for sale, and in the store for advertising. Those circuits get hot, and without a fan to cool them off, they can burn out. Just like any electronic device.

 

[steppinthrax]

Originally posted by: SlickSnake

Originally posted by: steppinthrax

Originally posted by: alfa147x
Do you know were I could find this?

http://www.eaprogramming.com/

I didn't see anything in my manual about leaving the TV on for 100 hours or so???? But others say it's in their manual.

It's not in my manual. And I wouldn't personally recommend it. Even my 24 hour Walmart has a period they turn off all their TVs and LCD displays at night, both the ones for sale, and in the store for advertising. Those circuits get hot, and without a fan to cool them off, they can burn out. Just like any electronic device.

I wasen't using my dvd player because it broke but I kind of had ajury rig setup where I hooked my Laptop computer to my TV though VGA port and a phone jack to the phone jack on the TV. I had it running on a res of like 1336 x 768 or something like that. I had it running in PC mode for the TV which made things bright.

 

[steppinthrax]

Originally posted by: SlickSnake
Interesting. My 46" Aquos don't make a sound. Only a relay that clicks when it goes on or off. The back light is powered just like a regular florescent light would be, and sometimes those transformers hum a little bit. I doubt it is cause for concern, and since normally you have the volume turned up, you wouldn't notice it anyway. Some of the cheaper brands like Scepters make so much racket from the cheap transformers in the back lighting people will take them back, hehe.

Do you use your internal tunner or the cable satelight box???

 

[SlickSnake]

Originally posted by: steppinthrax

Originally posted by: SlickSnake
Interesting. My 46" Aquos don't make a sound. Only a relay that clicks when it goes on or off. The back light is powered just like a regular florescent light would be, and sometimes those transformers hum a little bit. I doubt it is cause for concern, and since normally you have the volume turned up, you wouldn't notice it anyway. Some of the cheaper brands like Scepters make so much racket from the cheap transformers in the back lighting people will take them back, hehe.

Do you use your internal tunner or the cable satelight box???

Both. But normally I use my SD Dishnetwork DVR as the tuner. If I want any HD local stations, I have to use the built in tuner on the TV. I haven't upgraded my Dish DVR to an HD one yet.

 

[steppinthrax]

Originally posted by: SlickSnake

Originally posted by: steppinthrax

Originally posted by: SlickSnake
Interesting. My 46" Aquos don't make a sound. Only a relay that clicks when it goes on or off. The back light is powered just like a regular florescent light would be, and sometimes those transformers hum a little bit. I doubt it is cause for concern, and since normally you have the volume turned up, you wouldn't notice it anyway. Some of the cheaper brands like Scepters make so much racket from the cheap transformers in the back lighting people will take them back, hehe.

Do you use your internal tunner or the cable satelight box???

Both. But normally I use my SD Dishnetwork DVR as the tuner. If I want any HD local stations, I have to use the built in tuner on the TV. I haven't upgraded my Dish DVR to an HD one yet.

OK

The reason why I ask this is do you notice the channel changing slow on the built in tunner. Like on a regular TV you can flip flip flip though the channels to a point where channels don't appear before you go to the next one. I have some analog along with digital channels. I have to change channels one by one.... I think it's normal but you know what I mean???

 

[SlickSnake]

Ahh, I think I understand what you are asking. In another thread you were talking about the slow tuner. I have an HD dish tuner on a non HD TV in my bedroom, so I can get some stations I can't get otherwise. That HD tuner is SLOW tuning in HD channels. The Aquos is a lot faster, but it is slower than tuning in just SD signals would be on the old TV tuner in my bedroom. I hope that clears up your question.

 

[zinfamous]

failing to break it in shouldn't be causing the hum...and I wasn't aware that LCDs needed to go through the break-in period?

 

[Tiamat]

its probably from crappy coils on the circuit board. Half of my LCDs have some sort of coil whine/buzz which changes with various brightness settings. I have very sensitive ears though, most people don't know about the coil whine.

 

[steppinthrax]

Originally posted by: SlickSnake
Ahh, I think I understand what you are asking. In another thread you were talking about the slow tuner. I have an HD dish tuner on a non HD TV in my bedroom, so I can get some stations I can't get otherwise. That HD tuner is SLOW tuning in HD channels. The Aquos is a lot faster, but it is slower than tuning in just SD signals would be on the old TV tuner in my bedroom. I hope that clears up your question.

Yes that was my question. So in other words the HDTV tunners (integrated) are in general slower then SD (old fashion TV)

 

[potato28]

Give it time to break in. I have a low pitch hum with my bulbs only now, but the first week I had my LCD TV it made all sorts of funny noises.