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Hissing noise horizontal lines - Philips Computers & Internet

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Hello erl, hi.... the hissing noise is usually caused by high voltage arching, but this is suppose to be soft. if the hissing is unusually loud, the high voltage transformer clip cap may be loose, this may cause the horizontal line you see on the screen. take precaution when dealing with this.... here are steps that may help..

1. unplug the unit. allow around 5 minutes for all voltages inside the unit drops to a safe level.
2. open the back cover. place the monitor face down on a table with a dry clean rug or towel.
3. locate the picture tube. on the top side you will see a wire with a cap at the end.
4. use or wear a cloth glove and feel if the cap is loose. re clip the cap and make sure it is secured.
5. replace the back cover.

Posted on Feb 16, 2012

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I have one LG 21" color flat tv (magic eye) and it is not getting start.It was working properly with some hissing sound but yesterday it didn't started, the LED at the front panel is glowing b


Hi Manher
Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

Sep 20, 2014 | Televison & Video

1 Answer

Hissing noise


air leak check the air lines... look for cracked and split lines spray some carb cleaner around and it will change the engine speed were the leak is.

Feb 22, 2014 | Ford Cars & Trucks

1 Answer

HISS from Numark DM1200 mixer. Not present in speakers (self powered) when mixer off. Using XLR cables with telescoping ground lifts on each line. Monster 3500 power filter. Ideas?


All interconnected equipment MUST be powered from the same receptacle or source. The XLR to the speakers should NOT have ground lift. The power for the mixer should come from where the speakers are and be routed alongside the XLR cables. All the other connected items should also be powered by the same source. The ground bounce within a building cannot only cause noise, but can rupture the input circuits of equipment. As an electrical engineer I don't know why manuals supplied with the equipment doesn't go into this more. The professionals at the big venues all know this as they have had to pay to get equipment repaired.

Now to get down to "hiss" once you get the other stuff straightened out, there are two things to know at the start: The first is that due to the statistical nature in electronics "noise and hiss" are among the laws of physics that we can't completely get around. The level of the hiss should NOT be objectionable however. The second thing is that proper level setup is important to minimize the effects of noise and hiss. You should be sending the levels to the powered speakers at near full line level into the line inouts, never mic inputs that some have. Using excess gain at the speakers will amplify any noise pickup on your audio lines. Next, at the mixer, try to keep all the level controls around 10 to 2 0'clock for rotaries and 70% for faders. Excess gain at certain stages will cause hiss to be objectionable.

Mar 19, 2011 | Numark DM1200 DJ Mixer

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Tv not switching on just makin noise from power supply & hissing @ the flyback transformer with horizontal becoming extremly hot then afew min later horizontal burns out(D1398)


If the horizontal transistor getting shorted, this could happen.
Check the transistor 2 SD1398. If found faulty replace it.
But replace black colored doides in the circuit as a whole.
Leaky diodes can not be determined easily with the multi meter.
Especialy the small high voltage diode near the small transformer
connected to the 2 SD1368 transistor.

Sep 03, 2010 | Televison & Video

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No horizondal oscilation.


no line flyback transformer
vertical line horizontal out put circuit
horizontal line vertical output circuit
at fault

Sep 14, 2009 | Televison & Video

1 Answer

There is a hissing noise in back of tv and picture goes on and off zenith d36d51


Hissing noise and picture on and off means faulty flyback transformer, it has a small crack and voltage is leaking out, replace the flyback, if tv still not working replace horizontal output transistor (broken flyback could blow the transistor).

Aug 09, 2009 | Zenith D36D51 36" TV

1 Answer

Hissing noise pedal goes to the floor


Sounds like a broken brake line. The broken line has emptied your master cylinder leaving you no fluid and that's why the pedal goes to the floor. Very dangerour to drive in this condition, be careful.

Jul 29, 2009 | 1992 Subaru Legacy

2 Answers

My truck has a hissing noise coming from somewere when i start it up


check ur vaccum line...i had the same problem and i found that mine line was off...try there...

Jun 30, 2009 | 1998 Ford Explorer

1 Answer

Hissing noise in freezer


When you observe this is your compressor quiet? Then most likely your refrigerator is in defrost mode. The water is coming off the evaporator (think of a very cold radiator) as the defrost heater element warms. This element is similar to the electric heating element in the bottom of your electric oven. the water hits it and it will hiss. This is part of the normal operation of a refrigerator. The defrost cycle usually lasts from 20-30 mins and will occur 4-6 times a day. If you are having trouble with frozen food melting then re-freezing, or the temps are on the warm side, you might need to have your defrost timer or defrost termination switch looked at.

May 26, 2009 | KitchenAid Refrigerators

1 Answer

Brakes go to floor -- hissing noise and ABS light on-


if you hear a hissing noise, check first the all the brake lines are not leaking, if that is ok check the vacum line on the master cylinder

May 09, 2009 | 2002 Kia Sedona

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