Question about Philips 15PF5120 15 in. LCD Television

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I have audio,but no picture.Just stopped today.haven`t used a flashlight yet. Voltage inverter? I work on audio amplifiers,but not TVs. Any help would be nice. Thanks; Clay K. Smith

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  • cruzbluz Aug 28, 2010

    C16,and c17 do apear to be bulging on the tops.Didn`t have my VOM so didn`t check F1.

    Checked the flashlight ,and I could see the football field.What`s the board reference #?

    I`ve written down A4D75831Y163622535

    Clay

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First you should find out if the image is still there - if it is then the inverters for the CCFL tubes have failed. If they have failed it will be very easy for you to fix them - basic switching power source, probably the power transistor failed.
If not then the problem is either in the connections to the panel or the image processor. If it's in the processor then this monitor is dead - as you know unsoldering a processor involves a very special heat gun and a lot of patience for a very up to chance result. Add to that the fact that it will be almost impossible to find a new processor on its own and a replacement mainboard will cost you more than the tv. Time for a new one.

Posted on Aug 28, 2010

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The backlight inverter has been a common failure for this set. Check the electrolytic capacitors C16 and C17 to make sure they aren't bulged or domed on top rather than flat, and make sure F1 (2.5 amp fuse) isn't open. If these parts are bad, you can replace them and save some money, or if you can find the backlight inverter board you can just replace the whole board. I searched a couple of our parts dealers and was unable to find the board in stock. It may be tough to find one. Good luck!

Posted on Aug 28, 2010

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It's could be one of two things (well, generally speaking).

1.) inverter board. You can check this by putting the TV on something that's broadcasting or playing (a channel or an input playing a DVD or something like that, where you can hear the sound) and then take a flashlight and put it directly on the screen so the light is pointed at the screen. Put it as close as you can, it should be touching the screen so you can't see light coming out the side of the flashlight. Can you see the picture faintly moving normally? This usually works on something that's brighter and has lots of onscreen action, I wouldn't choose a documentary on deep space or something like that for this test. But if you can faintly see the picture moving as it normally would it's most likely your inverter board gone bad.

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Either of these you might be able to find a replacement on eBay with a tutorial on how to swap out the components on YouTube. If you believe this may be beyond the skillsets you posses, then you may just consider buying a new one as technicians can be expensive and these TVs are getting cheaper and cheaper every day.

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My syncmaster just stopped working one day after i woke up.its black but if you look close enough,you see your desktop. please help=mekondjol@yahoo.com


That means that the inverter is gone.

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