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Re: d52w20 rce not coming on
Hissing noise indicates to me you have a high voltage problemm... likely a flyback. could be a crt or splitter. if its the flyback then the horizontal transistor could have blown. I would not suggest working on this unless you have had some electronic experience.
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Sound is completely normal on all Audi's.
Your A8 uses an Orifice tube to regulate the pressure between the two halves of your air conditioning system. A hissing sound is normal after a shut down as the system equalises. Usually lasts about a minute and is more noticeable on warmer days.
Location on an A8 is on the very right hand side of the bonnet just under the windscreen - that's where the hissing will be coming from.
the hissing is coming from the high-voltage transformer used to run the back lamp for the screen, if there is a high amount of humidity or dust arround it the electrical bleed-off makes a hissing sound, just lightly blow it off with a can of PC cleaner/Duster air. If the problem still remains, it is nothing seriouse to worry about unless the picture starts to cut out then you may have a blown capacitor in the inverter section of the television. Easily replaceable by any good tv repairman.
if you heard a hissing or like static sound your board probably has a hole in it now. the board on the left side with the flyback fransformer. the hole is from where a prong has come loose an is arking over an it burns the board the ark is the sound you heard.
ih some older lap tops have a wheel on the side of the screen that enables you to adjust the screens light or darkness. please excuse me if I am stating the obvious but I am not totally familiar with this model
as for the hissing this sounds like the fan needs cleaning as it is running under speed and causing the system to slightly over heat which is why the light keeps flashing..
In reply to your question with regard to can it be fixed is it worth it. if it was mine I would take it apart and clean the fan. In your case you should take it to a small out let to get it checked over. Hope this helps
If the noise from the compressor sounds like a humming followed by a click, the compressor is "short cycling". Could be either the compressor relay or the compressor itself is bad. Not sure on the hissing noise. Could be just a loose panel that needs to be tightened or adjusted.
Does the cord plug directly from the wall into the monitor, or is there a power "brick" adapter between?
If there's a "brick" listen to see if the hissing is coming from the monitor itself or the brick. If the hissing is coming from the brick you may just need a new power adapter.
If there's no brick or the hissing is coming from the monitor, the monitor probably needs repair. With the price of LCD monitors these days compared to the price of labor, you're probably better off getting a new LCD monitor. Just make sure you take your old one to a proper E-Waste facility so it doesn't pollute the environment.