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Picture problem with Philips 17'' LCD TV, model 17PF8946/37

The L.H. half of the picture is intermittently unstable.  The TV often goes for several minutes without the problem, but then will go for several minutes with the L.H. portion of the screen flickering.  When it's happening, that part of the screen shows vertical bars consisting of the colors in the last stable image; it ''latches onto'' those color bars until the next stable image can be produced.  The behavior seems unrelated to how long the TV has been on or how well it has been warmed up.

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  • earlyreed Nov 30, 2008

    I assume the problem is somewhere in the main controller board, not the power supply board or the screen itself, but before I try to find a replacement board I want to know that for sure.

  • earlyreed Nov 30, 2008

    It is model no. 17PF8946/37. (I had originally tried to include that information, but the model number wasn't recognized and was therefore changed to "generic.") I'm not sure whether the TV is under warranty, but I am considering a DIY solution in any case.

  • earlyreed Nov 30, 2008

    I cannot find anything under "Menu" that says "Set up," nor can I find anything relating to "Reset all."  I've searched through the onscreen display as well as the manual.

  • earlyreed Dec 02, 2008

    Thank you for the suggestions. The first respondent (Benimur) was helpful in ascertaining that it was the main board, but his correspondence disappeared with the appearance of a message from a second respondent (who offered a suggestion that was not useful). I had, in fact, arranged to buy a board from ShopJimmy in the meantime, but it is great to have confirmation that that was a good idea.

  • earlyreed Dec 07, 2008

    Just to keep anyone who's interested apprised of the outcome (so far) regarding my Philips TV (if for no other reason than for its cautionary value):  I ordered the replacement motherboard, which seemed to me (and to others) the logical culprit.  Result:  no change in behavior.  (So I now have an extra motherboard, which probably is functioning just fine!)  The problem must be with the screen (LCD panel) itself; I had forgotten that there is a board resident in it that contains active electronics.  So, unless I find a source for a cheap replacement panel, it sounds as if I'm out of luck here.


    The problem is, incidentally, related to warming-up of the unit.  The L.H. half of the screen starts out completely black, then begins to flicker on with an image.  Partly warmed up the image is stable for a half hour or so, and then the flickering starts up with a vengeance (and doesn't stop).

  • earlyreed Dec 22, 2008

    Problem is now solved!  The cause is truly bizarre, and it has to do with a mistake in the original assembly.  When the cable connecting the motherboard to the panel was inserted into the socket of the panel a pin in the latter was bent, but in a way that still allowed contact with the wire.  The unit thus functioned normally (so that it passed QC, obviously) but was left with an intermittent problem that first showed up after more than a year of use.  Straightening the pin and reconnecting the cable solved the problem completely.  I guess the moral of the story is not to assume everything was assembled correctly at the factory!

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It is more likely that your problem is a panel or TCON board problem that a main controller (whatever that is) problem. When half the screen is involved, it is either the LCD panel OR the TCON board which addresses the panel that is at fault.

Posted on Dec 05, 2008

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  • Master
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Hi,
Problem seems in main board of your Philips 17" LCD TV.
Required main board is available in Shop Jimmy on very low price approx $40
Good Luck.

Posted on Nov 30, 2008

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Hi Please try to reset all setting and then to see if the problem is solved. 1. Press the Menu on your Remote Control;
2. choose Set up on the OSD;
3. then choose Reset All settings; 
4. Press the Exit on your Remote Control to remove the OSD.

Posted on Nov 30, 2008

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  • ABHISHEK.C
    ABHISHEK.C Dec 02, 2008

    they have a sensor on the front of the tv to measure ambient and adjust the tv brightness to the ambient light.


  • ABHISHEK.C
    ABHISHEK.C Dec 02, 2008

    OR

    Lines = bad circuitry. Could be a microchip. Could be a bad power supply to the microchip. Only a tech could look and tell.


  • ABHISHEK.C
    ABHISHEK.C Dec 02, 2008

    you might just have a problem with the inverter cicuit section of your LCD TV, bring it to he repair shope. cheer

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Hi and welcome to FixYa,

Initially, as you posted possibly heat related. Could you post back the exact model pls? And would the unit be still under warranty or are you considering a DIY (do-it-yourself) repair?

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 30, 2008

  • Louie  Role
    Louie Role Nov 30, 2008

    Hi again,

    Appreciate the quick postback. Offhand, I would tend to agree with you:


    • power supply - doubtful otherwise you the unti will not power up at all or immediately revert to protection mode;

    • LCD panel/screen display - likewise doubtful, if so the problem would not be intermittent;

    • the above being the presumptions, then the the mainboard/controller would be the likely culprit.This could be verified by comparing voltage readings with known voltages referencing a schematic diagram.
    This of course would require a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.

    Cheers.


  • Louie  Role
    Louie Role Dec 03, 2008

    Glad that my proposed probable fault confirmed the mainboard as the defective component.

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