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I have a 52" lcd it has a grey haze or like sheet

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  • Televison & ... Master
  • 73,611 Answers

Check and replace the power supply regulator board. Check the back-light inverter boards too.

Posted on Jul 15, 2013

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: noise coming from power supply

When we turn our TV the humming and buzzing begins! We cn mute it and it goes away and then it when we turn the sound back on the sound is back! How can we fix this?

Posted on Oct 14, 2008

Twizted
  • 30 Answers

SOURCE: Power Supply Buzz

Did you use the same as original replacement capacitors? I have repaired many of these power supplies for others and never had an issue. It is possible that the failing capacitors could have caused more damage to the power supply but I have never seen it in over 50 repaired AKAI power supplies. Also, make sure you replaced the capacitors with the proper polarity.

Posted on Nov 12, 2008

ginko
  • 19396 Answers

SOURCE: 42" Vizio - no picture no sound

If the TV goes in standby, then it is in protection mode.

Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box
connected.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , starting the flashing light.

If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |


On LCD Pay particular attention at inverter and power board, power board can be inspected looking for bulged or leaking capacitors, then tested with a multimeter. The inverter is more difficult to test , there is need to read voltages, should be done by a tech. Also the LCD controller board can cause same problem

Posted on May 04, 2009

  • 10 Answers

SOURCE: Sceptre LCD TV power come on, but there is no picture or sound.

There are two easy fixes you can try. Both require you to take the back panel off. If you are not comfortable doing this, take it to a repair shop.
UNPLUG IT.
Place the TV face down on a soft/solid surface.
After you get the back panel off, there are three silver boxes. There are white and black wires leading from the off switch to the top silver box. Take the cover off that box.
Inside is a ceramic fuse. Test that fuse. If it is blown, your local electronics shop can find a replacement.
If not, disconnect the white and black wires from the PC board. Remove the 6 screws holding it in place.
Look for scorch marks under the board.
Cut a thick piece of plastic and tape id down over the scorch marks.
Re-attach the board with the six screws and re-connect the black and white wires.

Turn the power switch to the OFF position and plug in the TV.
Turn on the power switch while WATCHING the board you just removed.
If you hear a sizzle, turn off the switch and get a thicker piece of plasic.
If not, the TV should come back on.
Re-assemble the silver box and put the back on.

Hope this helps.

Posted on Aug 09, 2009

  • 21 Answers

SOURCE: LCD TV, No Power, No Standby LED, Buzzing sound from Power supply

sounds like either way your power board is bad- do you intend on replacing a component? I would look for Puffy caps- you know- leaking from the top-

Posted on Aug 21, 2009

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The camera took great pictures then all of a sudden the screen appears as a purple haze -- and the pictures come out as just a purple blurry haze. Adjusting brightness doesn't work. Yet, the shutt


If the LCD displays correctly on previous photos then the problem is more than likely a CCD or associated ribbon connector failure due to moisture/condensation or age/misuse. Good luck with finding a replacement part!

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This sounds to me like it could be the color wheel or the ballast of the unit. The bulb is always the first step, but it depends on what kind of buzzing you're hearing. The ballast will usually click to ignite the lamp, while it may also buzz when it's not functioning. The color wheel will also buzz if it gets stuck, or rattle when pieces inside are broken.

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Permanent blue haze on screen; looks like


The fact that you continue to have sound while the picture disappears points to one of three potential issues.

Issue 1: the LCD Panel.

Issue 2: The Inverter Power Boards (though these tend to cause power/shutdown/no video at startup than video distortion)

Issue 3: the Time Control Board - a small board at the top of the LCD panel on the back that relays data to the rest of the screen.

Any one of these three repairs, you should call Sony if the unit is outside of manufacturer's warranty. They are expensive to perform, and the parts are not cheap. Hopefully you have an extended warranty to help with the issue.

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I have changed my rear projection lamp and now the picture is green can you tell me what is causing this please.


It sounds like your light engine is defective. My Projection LCD had this happen and it started with a growing blue haze, others experienced a yellow haze, I suspect yours is manifesting with a green green haze.
It is a very expensive fix, depending on the age of your set, you may find it cheaper to replace it with something new, because a light engine itself costs nearly $2000 and another few hundred to install and align, not something a do-it-yourselfer is able to do

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put a fan behind it, if it works then its heat related if not then you probably need a new main board.

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if the tv is an LCD then you may have power supply issues inside the tv causing all of the trouble.

if it is a projection tv then it sounds like you have multiple problems.

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