Question about Philips 50PF9956 50 in. HD-Ready Plasma Television

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No picture, just audio

I did see a video image. Could this be the inverter?

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Hi 
I am happy to help, we need to check the backlight inverter.

  1. Turn tv on and get to a point that you have audio.
  2. Take a flashlight and shine it on the screen.
  3. Look very closely at the screen for a very dark video image.
If you see an image you have a bad inverter, you should be able to replace it yourself. I can walk you through in chat. Let me know your findings. Lone99star  

Posted on Jan 20, 2009

  • Jason Morris Jan 20, 2009

    Yes you have a bad inverter, I will check with parts vendors and get you a price on replacement board.
    Lone99star

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Hi doubles,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
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1 Answer

The lcd inverter appears to be out no backlight can hear audio and see screen in light also the usb and the touchpad does not work


If you hear the hard drive spinning and you think Windows is working but you can't see an image then :-
You could have a defective screen - a defective inverter or a CCFL lamp or simply the video cable needs reseating. After reseating the video cable and the problem is still there then :-
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

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  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
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Picture goes off within seconds once turned on


You will have to do some detective work here. If you are getting audio but no video then
the next time this happens take a strong flashlight and hold it against the LCD screen.
Look closely around the edge of the flashlight and see if you can see an image.
If you see an image then the problem will probably be in the inverter board or the power supply board to it.

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1 Answer

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Hi washingtonrm, 
I am happy to help, we need to check the backlight inverter.
  1. Turn tv on and get to a point that you have audio.
  2. Take a flashlight and shine it on the screen.
  3. Look very closely at the screen for a very dark video image.
If you see an image you have a bad inverter, you should be able to replace it yourself. I can walk you through in chat. Let me know your findings. Lone99star 
 

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1 Answer

My 26 inch insignia has sound but black picture


Hi freelingtrapt, 
I am happy to help, we need to check the backlight inverter.
  1. Turn tv on and get to a point that you have audio.
  2. Take a flashlight and shine it on the screen.
  3. Look very closely at the screen for a very dark video image.
If you see an image you have a bad inverter, you should be able to replace it yourself. I can walk you through in chat. Let me know your findings. Lone99star 
 

Jan 22, 2009 | Insignia LCDTV26 26 in. Television

1 Answer

Picture will not come on. only sound


Hi jsevcik897, 
I am happy to help, we need to check the backlight inverter.
  1. Turn tv on and get to a point that you have audio.
  2. Take a flashlight and shine it on the screen.
  3. Look very closely at the screen for a very dark video image.
If you see an image you have a bad inverter, you should be able to replace it yourself. I can walk you through in chat. Let me know your findings. Lone99star 
 

Jan 20, 2009 | Philips 50PF9956 50 in. HD-Ready Plasma...

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