Hissing Sound In TV
At the starting my TV produced heave hissing and wiring noise. After few minutes it will disappear. But picture and sound are clear.
Answer:
Hissing sound usually are caused by transformer, inductor/coil due to loose lamination of the core. An overheated transformer also could cause hissing sound. This is why you need to know if the transformer runs hot or not. If it is very hot and too hot to be touched then suspect a bad transformer otherwise suspect a loose lamination of the core. Some repair techs called hissing sound as noise or even high pitch sound.
If you came across an equipment that work normally except for the hissing sound, the first thing you do is to gently hit the transformer or even the coil with the handle of the screw driver. If there is no changes probably either the transformer itself is bad or the corresponding component have problem. If the transformer is quite down after you hit it this means there is loose lamination of the core.
What you can do in this case is to dip the transformer into shellac for about an hour and then let it dry for a day. The hissing sound will usually go off. I had done that few times and each time it worked.
(20)Dislikes
(4)
32 Comments
Leave a Reply
Cancel reply
shehab kably
July 1, 2013 at 1:55 pm
Where from i can order shellac please?
Jestine Yong
July 1, 2013 at 9:17 pm
HI Shehab,
You can order it from any hardware shop. It is use on wood (furniture) to make it shine.
Jestine
Joseph Mutwiri
April 17, 2022 at 8:47 am
My TV Sony digital 14UMG9B on but not completely on only whistle dim sounds heard.wharlt may be the problem?
Gavin
November 11, 2015 at 6:46 am
hi Justine my 72 cm crt telefunken tv has has no picture, no sound, a bleanking red standby light and a clicking sound from inside the set. Pls help. Thank you.
Jestine Yong
November 11, 2015 at 10:25 am
HI Gavin,
Have you checked if the output voltages from the power supply good and stable? Did the CPU IC receive a steady 5 volt supply? Have you checked if there is any bulged e-caps in the power supply section?
Jestine
RKT
February 4, 2016 at 6:10 pm
dear sir,
my Philips 24PT244 TV giving whistling sound no audio/video, I asked the eng he told that yorkcoil goes bad, cn u pls suggest.
Jestine Yong
February 5, 2016 at 11:37 am
Hi Rkt,
If the Yoke coil is shorted then the power supply sometimes can produce hissing sound. Before that make sure the B+ supply is good. If it decreased then suspect flyback, HOT or even the yoke coil.
Jestine
xvr
April 30, 2016 at 9:04 pm
I have a problem with hissing transformer in a LED TV. The sound becomes quieter if I push the board gently but hitting the transformer has no effect.
Do you recommend to desolder it and then soak in shellac and solder it back?
What do you mean by "loose lamination of the core"?
If shellac fails where can I buy transformers? Capacitors are everywhere, but I haven't seen anyone selling trasformers yet.
Thanks!
Jestine Yong
May 2, 2016 at 12:06 pm
Hi Xvr,
I suggest that you make sure the screws really tighten to the ground in the power supply board. If no dry joints and the hissing sound is till there then you may need to soak it into shellac. Loose lamination meaning the winding in the transformer has become loosen causing vibration. You can read the below link why transformer hum:
http://www.mgmtransformer.com/faqs/why-do-transformers-hum/
It is hard to buy smps transformer alone because they are uniquely designed. This means if you can't find the transformer, you have to buy the whole board.
Jestine
janyves
July 24, 2016 at 6:01 pm
Recently I changed the power board for my sharp 21h-sc . It worked for like a minute and went off. When I push the power button I hear hisses around the power PCB and the i.r sensor blinks before it powers off. I left it overnight and in the morning it came on normally. What do you think is causing this ?
The power PCB is an external one. I incorporated it with the TV when the power side refused to respond to repairs.
janyves
July 24, 2016 at 6:06 pm
The I.r sensor blinks after I switch the TV off. It hisses with no audio and video
Jestine Yong
July 28, 2016 at 5:59 pm
Hi Janyves,
Do you mean now the TV can be turned on normally?
Jestine
Robert
February 14, 2017 at 4:17 pm
Hi Jestine
Its Robert from namibia im also having a problem with a samsung ua40eh5000 no power it did take long to come on after several attempts now its just a hissing sound.
Jestine Yong
February 15, 2017 at 8:40 pm
Hi Robert,
May I know what have you checked?
Jestine
Achieve
October 20, 2017 at 2:28 pm
My Videocon tv is not turning on but the red light flashes only once and some hissing sound is coming from back but tv is not turning on.
Please tell as to what should I do.
Thanks
Jestine Yong
October 23, 2017 at 12:36 pm
Hi Achieve,
What type of TV was that and what have you checked? Have you checked if all the output voltages good?
Jestine
Jack
November 7, 2017 at 2:40 pm
I have a problem here, my crt tv just turn on few second then turning off it self and leave it to stand by mode. I trying to turning on with the remote nothing happen it wont turn on or anything, what i should do?
Jestine Yong
November 8, 2017 at 8:58 pm
Hi Jack,
I suggest that you check the power supply first and make sure it produce all the required output voltages.
Jestine
g5
December 13, 2018 at 7:01 pm
this forum is really cool
Beth Dewhurst
July 9, 2019 at 3:00 pm
Hi my Panasonic has just broke. The screen flashed a couple of times with the channel it's on then It makes a sound like pressure being released a few times and then goes black, the light flashes red but then all totally goes off. What could this be?
Jestine Yong
July 10, 2019 at 8:08 am
Hi Beth,
It could be power supply fault with bad caps or even faulty mainboard and etc. Without hands on assessment on the set I would not know what will be the actual cause. I suggest that you check and make sure all the output dc voltages from the power supply are good and stable before suspecting the mainboard problem.
Jestine
Allie
September 11, 2019 at 1:53 am
I have a MECER LED42" TV.There is a hissing sound from the speakers.It grows louder with time.Previously the noise will disappear but nowadays it is constantly having the 'shhhhh' sound. What could be the problem?can it be fixed?
Jestine Yong
September 11, 2019 at 7:25 am
Hi Allie,
Try check the capacitor in the audio circuit. Make sure the power supply output filter capacitors are good also.
Jestine
Jestine
Mohan
October 13, 2019 at 10:39 pm
My Panasonic TV turns on and my brightness starts to reduce and display completely goes blank after 30 seconds or a minute. When brightness is reducing I start to hear a small hissing noise from behind the TV and when TV completely goes dark hissing sound goes away. Can u help me!
Jestine Yong
October 16, 2019 at 6:14 pm
Hi Mohan,
Hissing sound could be coming from Flyback transformer and etc. Once the TV shutdown, this means the Flyback no longer energized thus you won't be able to hear the sound. This means you need to open up the cover and see where is the sound is coming from. Sometimes a bad Flyback you can see a small arcing! If you are a non technical person, leave the TV to a qualified repairer to do the job.
Jestine
Jordan
October 18, 2019 at 10:49 am
i dont mind the noise but can this result in damage over time?
Nathan
November 8, 2019 at 3:33 am
So I turned off my TV and it started to make a high pitch noise. Naturally I unplugged the TV from the outlet the noise stopped. I plugged the TV back in and it started to make the same noise. The TV won't turn on and the noise keeps on going. Please help.
Jestine Yong
November 12, 2019 at 9:28 am
Hi Nathan,
If you are using a CRT TV then possible the noise came from transformer/flyback transformer. You need to open up TV to check the source of the noise. Sometimes it can be due to some bad components.Without hands on assessment I would not really sure which one is the main cause. This means you need to troubleshoot it.
Jestine
Anne
December 13, 2019 at 4:31 pm
Hi, I'm Anne from Kenya. My Samsung smart tv shows tiny horizontal lines at the bottom it started with two now they're seven
Jestine Yong
December 18, 2019 at 4:33 pm
Hi ANNE,
It seems to be the problem of the LCD panel and it could be the Tab bonding or COF fault. You need to get a repair tech to check it.
Jestine
Sindy
December 25, 2020 at 1:06 am
My television write something which says steam hissing what can i do to solve this problem
Jestine Yong
December 28, 2020 at 12:34 pm
Hi Sindy,
Sorry I have not seen such message before in a TV. Perhaps you can take a photo of that written message and send it to my email by clicking on the contact us.
Thanks.
Jestine