Question about Philips ProScreen 4600 Impact Multimedia Projector

5 Answers

Vertical lines all over image after few minutes turn on

I had this projector for a while and rarely use, lamp life is about 2000 h left to use. Recently after 5 minutes or so of power on, the screen is broken up by many vertical lines ( continously from top to bottom screen )with equally spacing. Picture is still there but degraded badly by these lines ( like mosaic affect ). Colors are ok, sound is ok . Checked connection, cable etc... OK.
Please help me with your expertise. Any suggestions would be verymuch appreciated.
Many thanks

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  • 3 more comments 
  • jaytango Dec 13, 2007

    Thanks so much for your suggestion, I'll see if I can get access to the service manual.

  • MREmerton Mar 08, 2009


    I basically have your problem, but MUCH more advanced.

    The picture below, shows the "Phillips No input signal detected" screen (or what used to be).

    My father believes this to be due to capacitors getting old and dying.

    In the OP's case and mine it *might* be a capacitor which is dying.

    My father is an electrical engineer, and so when he has time, will open it up and probe a bit with a volt meter.

    For reference, it appears in my case that any source @ 50Hz, be it Composite PAL (UK) or VGA @ 50Hz then we can see an image clearly (albiet with sparse vertical lines).  If I push the VGA beyond 50 Hz then the screen is incomprehencable.

    I had to use an Acorn RiscPC in order to generate older resolutions (800x600 @ 10-100Hz) in colours B/W, 16 Grey scale, 16 Colour, 256 Greyscale, 256 Colour, 32K Colour, 16.7 M Colour.

    I use this screen daily as a normal TV replacement, and even with this annoying problem (which goes away after 30 mins) feel that the 70" image is much better than my 28" crt ;@)

    Will post back once we have fixed/killed the projector!

    The screws to get into it are accessable from the bottom, and are torx (star) screws.  you will need a REALLY long screwdriver to get at them, 2 are underneath the back? rubber feet!

  • Anonymous Mar 14, 2009

    Hi there. MREmerton, can you please advise us poor users of the philllips proscreen which configuration you are getting the best picture from? i.e what resolution and are you using 50hz frequency or a different frequency? As much as I would like a new projector, these things are still selling for round $US300 and were $US7000. Is it worth having a basic service done to ensure convergence/allignment is ok or just sell it off to help pay for a new one?!

    Cheers :)

  • MREmerton Mar 18, 2009

    Hi, the best config I got from my ProScreen 4600 was this:

    PAL encoded 50Hz:
     DVD Player (no alterations)
    Free To Air Satellite Box

    800 * 600
    32K Colour

    50 Hz [I had to generate a 'Mode file' as apparently all the monitors definitions supplied with the OS I use (RISC OS) no longer use 50Hz!]

    These all produce a stable image, but with the the right 10 pixel border being green, and the left 10 pixel border being blue/red.

    I was also unable to get a PC with an ATI HD?? / NVidia card to generate 50Hz?  when it did the resolution went to 720*576.

    This in any case would not work as the projector needs 800*600, and as over here our full PAL resolution is 768*576, this doesn't meet what the PC outputted?

    Oddly anything below 50Hz caused the picture to be degraded again.

    This makes my dad believe it is a capacitor (our electricity is run at 230V~ 50Hz), as this is the frequency the mains comes in at.

    However I have attempted to open this beast, and found I was unable to due to needing an EXTREMELY long T10 screwdriver!

    Having basically only removed the rubber feet I replaced them, and put it back into position until I can get a longer one...but alas...I get nothing.

    This really makes me think its a dodgy connection, so once my EXTREMELY long T10 arrives, I'll have another crack!


  • MREmerton May 04, 2009

    For anyone still interested in this projector.

    My projector has failed a massive PSU failure.

    It appears that some of the capacitors may be faulty, and causing the PSU to not start up correctly.

    Taking this projector apart the 3 LCD assemblys and prysms to focus the light are all housed on a metal base so cannopth be pushed out of line whilst removing :) hopefully my dad can take a look at this board which we didnt get to last time (due to lcd housing).

    Will report back on further information, and failing that, will have parts to sell on for repairs.

    somewhere I have seen that the LCD mis alignment is all done on the Driver board (not physically) and mal-alignment can be due to the powerrail to this board being out of specification (PSU Fault)



5 Answers

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This is the exact problem Im having, the picture looks the same! Has anyone had any luck fixing it? please advise.

Posted on Feb 05, 2013


I need drive board for projector PHILPS LC4600(G)

Posted on Jun 27, 2008


I've got the Proscreen 4600 Endurance. Same probs with vertical blue lines to the left of white. Have tried s-video and composite (single analong) cables. s-video is better. when connecting to computer via data cable image is better yet.otherwise I think it's probably a service job, case seems difficult to open so far.....

Posted on Jun 14, 2008

Well i think we have the same problem i with our proscreen 4700 and the only thing i found out so far is that the rca and svideo jack on the projector have gone bad. Tried the data connector and the video was perfect. Tested the rca jack with new cables and another dvd player and it was still mesed up. So it is the hardware that controls the input for the rca and s vidoe jacks but still have not found a way to get the case open to see if some thing can be fixed from the inside.

Posted on Dec 13, 2007

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I think there is like in philips TVs a certain chip that has to be changed.chip heats up and then it works erratically.

Posted on Oct 04, 2008

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