Question about Philips 47 in. LCD HDTV

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Philips 47'' LCD TV will lose sound and picture for a few seconds then come back. I have a dish network HD receiver hooked up through a HDMI cable. Sometimes it will go days with no problems, sometimes it will do it 5 times a day.

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  • caetano340 Feb 05, 2010

    Even if it only happens with the dish network receiver? It works fine with the dvd player.

  • caetano340 Feb 05, 2010

    The power light stays on. I tried 2 different cables and the same issue. I tried different HDMI ports and it did the same thing. The screen goes black, but you can tell the tv is still on. The picture and sound then comes back on its own, works fine for a while, then does it again. Again, sometimes it will not do it for a day and sometimes it does it 5 or 6 times a day.

  • caetano340 Feb 07, 2010

    Could it be a HDCP Handshake problem? It seems to go away for a couple days when I reset the receiver. Then a few days later it will do it again.

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Hi there, they problem is not in the input to the tv (dvd/cable etc) your powerboard/videoboard is overheating! Right away place a fan as close to the back of the tv as possible, this will help cool the circuits down and might considerably prolong the usefullness of the tv..The next step in it breaking down is total powerloss, or a blinking powerlight, eitherway this is your solution;The caps (capacitors) in the powerboard are going out. This is a very common problem in all class and price ranges of modern lcd and plasma tv's/ monitor's. I don't know if this problem has been like this for awhile or it just started, but either way, if the tv takes an abnormal amount of time to "warm" up then it most likely will go out all the way sometime in the (near) future. If you have a tiny bit of will and knowledge ypou can open the unit and get to the print board. Examine this for "popped" capacitors, they will have a buldging top instead of a flat one. Im gonna try to include a pic of them here, if i can get it this time, I've tried bfore lol. But you can google image a "popped" or "bad" capacitor and you would be able, with ease, to diagnose if you have any of these. Usually only one or two. Radioshack sells capacitors (couple anyway) for $1.59 each. MAKE SURE the replacement is of the SAME voltage or HIGHER, or you will be right back replacing those 2. Every capacitor has a negative pole marked with an (-) on the side of the capacitor(by one of the "legs", always puit the negative (-) "leg" of the new capacitor in the same hole in the printboard as where the previous negative (-) "leg" of the capacitor was ( a capacitor with the negative and positive "legs" put in backwards will result in the new piece "popping" as sson as you turn it on!!) make sure the "uf" rating (for example the most common popped capacitor is the 1000 uf) is the same as the one you are replacing. I needed 1000 uf, 105 c and 26v (volt) ratings for the 1 capacitor I needed to replace to fix my LG 19" lcd panel monitor I found by the trash that the light came on off, but it didn't come on. I replaced that capacitor with ; 1000uf, 85 c and 36 v (volts0...It works fine eventhough the volts and the temperature rating (36v and 85c) was not the same as the (26v(volt) and 105c ) capacitor I removed !! Further, I've replaced capacitors that had the celcius rating of 105 with the only ones Radioshack had, namely 85 c(celsius) they have been working great, but I'm not sure about any effect, nor have I heard or read (yet?) about that making an urgent difference. Many threads that I've read people have done the same, so we should be ok (my stuff has been running good for a while longer then most brand new ones!.............(all these ratings ; 'uf ' and 'c' etc are on the side of the capacitor you are replacing and on the side of the ones you are replacing them with)...For all this all you need is the cheapest solder gun u can find (I bought one for $7.99 at Radioshack), a camera (to take pictures as you go to remember how to reassemble the unit) and, once you have your materials, 20 minutes to replace 2 or 3 capacitors and you are good to go...Most monitors and tvs (lcd/plasma) I've seen you have to lay flat on the ground/bed/blanket etc, to work on (screen side down). Usually there are 2 or 3 screws (or a few more) to remove, then you will have to carefully (its comes off easily most times)insert a flat screwdriver inbetween the casing and gently pry it up as you go around the whole frame. Sometimes you have to remove the little washer arouind the cable input orso, just be gentle and you cant go wrong. Once insidet here will be a box with wires running to the sides etc...unplug, gently, these wires and open the box. Inside you will find 2 or 3 circuitboards, check them all for "popped" capacitors, replace, reassemble and plug it in....Have fun becoming an overnight tv mechanic lol! If this helped (or not )please rate, thank you!Philips 47 - d4195d7.jpg

Posted on Feb 04, 2010

  • roadtrippin Feb 05, 2010

    Hi there, and thanks for the rating (now I'll do my best to earn it :) )



    To further you in the diagnosis of your problem I will have to ak a few questions, but it will quicken our process...,I need to know if the powerlight on the tv is on or off or blinks when the tv shuts down on its own...The problem could be in the wiring to the inputs ( bad 'pins' in the connectors), low grade cables etc....try wiggling or unplug and replug the cables to and from the tv and any connecting media (dish, cable box, dvd)...except the powercords...Any changes? ...Hope to hear from you and while I am waiting for your response i will check further into this problem!

  • roadtrippin Feb 05, 2010

    I don't believe it it a backlight problem, the sound wouldn't go out at the same time. These problems are very common, but I have not ran into many problem like this, that were not related to a broken capacitor. One of the causes of lcd tvs (or monitors) randomly switching off and back on, are 1 or 2 bad capacitors, but since you've eliminated these, I will have to do further research and create a checklist for us to go by...I shall return!!.....Meanwhile, if the tv is still in use, study any sounds/ picture changes and anything else that could seem to be of use for me...

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