Question about Philips 42PFL3704D LCD TV

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I have a philips tv model 42fyl3704d/f7 3 years ago it had no sound and all 3 hdmi showed what was on hdmi1. turning power on and off might fix it sometimes then put in the update p420s 108 ab and it fix the tv but now it is doing same thing as 3 years ago.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 148 Answers

SOURCE: Philips 47

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!d4195d7.jpg

Posted on Feb 04, 2010

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  • 2318 Answers

SOURCE: Philips flat screen tv will not power up.

Symptoms of a Defective or dying Power supplies on LCD TVs.
1. Light(s) on the front panel are behaving not normal example, blinking, amber color or
not steady, fainting, etc.
2. TV not turning ON properly.
3. TV turns OFF by itself.
4. Needs to be unplug to many times to make it work.
5. Humming or high pitch noise heard through speakers or at the back of the TV.

I repair these power supplies. Write to jah2mil@hotmail.com if you require further assistance.

Posted on Dec 20, 2008

  • 1 Answer

SOURCE: 42 plasma philips

I had a similar problem. You likely have 1 or more bad capacitors on the power supply board. You can easily identify them - they have a raised or rounded appearance on the top instead of being flat. Remove the power supply board and take to electronics repair shop and have them replaced. The capacitors only cost me $4.24 for two. Now mine works fine. The repair man replaced them for free. It took him only 10 minutes to solder them on the board. Easy, cheap fix but manufacturer won't tell you that. I fixed this on 1-02-09. My 2 bad capacitors were "3300uf 10v" and I replaced with "3300uf 16v" but you might be able to replace with "4700uf 35 v" also.

Posted on Jan 03, 2009

  • 10 Answers

SOURCE: Philips LCD TV "47, model PFL 8404H/12, NO SIGNAL on all 4 HDMI

This is quite tricky as it was working until last night and suddenly stopped receiving signals. What can happen wrong?
Do you have any other Player or other HDMI cables to try out. Sometimes the cables would be damaged or PC may fail to detect the HDMI.

Try this out from Philips helpdesk where there is new SW and FAQs are available.
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?ctn=42PFL8404H/12&slg=en&scy=CZ

Let me know if you are not able to upgrade the FW (if you do not get the support on ugprading)




Posted on May 11, 2010

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1 Answer

Why doesn't my tv have HDMI1?


How old is your set? Prior to HDMI becoming so readily available, the "average" TV had several different types of video & audio connections. This meant as many as 4 additional cables bundled together! Several years ago (especially when TV shifted from analogue to digital) more & more TV's incorporated DTI's (minority) and HDMI. Since the HDMIs allow higher data rate, meaning more pixels, high definition broadcasts could be enjoyed. Plus the cable also carried the audio signal as well.

To know more specifics, search for your manufacturers website ti research your model number. Odds are, it is no longer made and no upgrades are available ( cost).

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unplug TV and Bluray power cords from wall socket, replug HDMI cable in both units, replug power cords back in, turn them On and check.

Let me know how it worked. it seems Bluray player set its display resolution bit higher that TV doesn't support.
Please connect Bluray in TV by usual AV cable (yellow-red-white) and go to BD player setup menu and reduce HDMI Out resolution like 1080p to 1080i, then check it in TV HDMI input.

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We have a Polaroid 4241-TLXB television. This evening we turned on the TV and the Video6 (HDMI1) is not accepting sound. The picture is fine when that input is selected. We had our STB attached to HDMI1...


I am having a somewhat similar experience. The HDMI 2 is a little flaky on these TVs, try turning the input device that is attached to HDMI 1 OFF then reboot the TV. For some reason, if there is a signal going to both HDMI inputs at the same time there are major problems. I also found that if I input L/R audio into the HDMI 2 analog jacks, that sound also goes to HDMI 1(if no digital sound signal is going there).

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1 Answer

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2 Answers

Philips LCD TV "47, model PFL 8404H/12, NO SIGNAL on all 4 HDMI


This is quite tricky as it was working until last night and suddenly stopped receiving signals. What can happen wrong?
Do you have any other Player or other HDMI cables to try out. Sometimes the cables would be damaged or PC may fail to detect the HDMI.

Try this out from Philips helpdesk where there is new SW and FAQs are available.
http://www.p4c.philips.com/cgi-bin/dcbint/cpindex.pl?ctn=42PFL8404H/12&slg=en&scy=CZ

Let me know if you are not able to upgrade the FW (if you do not get the support on ugprading)




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1 Answer

Picture keeps alternating between HDMI1 "blank screen" and cable


try the lead in another slot and even another lead, if problem persists demand an engineer comes out.

Jul 31, 2009 | Philips 42PFL5603D 42 in. LCD HDTV

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Lose sound on phillips hdtv unless xbox360 is turned on


Common short the cover cap over the video & sound boards short out if you remove it the cap only (shield metal) it usually will fix this

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Mar 12, 2009 | Sony PlayStation® 3 (60 GB) Console

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