Question about CTX F973 19 in. Flat Panel LCD Monitor

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Monitor wont power-up

Stage-1 Recently my CTX P972L monitor showed tearing (interference type)lines on pressing the Power button but soon cleared and full video was present and stable. Stage-2 The problem got worse in that when the tearing lines dissapeared I would have no video signal and the power button became inoperative (LED on all the time). To resolve this I had to remove the power plug then replace it. The power button would then work fine and no tearing (until next time on power-up). Stage-3 Now the monitor wont power-up at all (no LED lights on the power button) however, on removing the power plug the blue LED lights momentarily. Similarly the blue LED lights up momentarily when inserting the power plug. But the power-on button no longer lights up when pressed and the monitor remains dead. Help ! Please can anyone suggest a possible componant/s that could be the culprit (a specific Capacitor maybe ?). I am reasonably familiar with PCBs and their componants but very rusty on fault finding especially without a circuit diagram. So techspeak wont frighten me and your expertise would be greatly appreciated to point me in the right direction and help me find this fault. Best regards, Bob

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  • Bob Hutchinson Jul 25, 2007

    Thanks Silverdragon,
    Your suggestions are really appreciated. There only appears to be one large electrolitic capacitor which is a 100mf 400v. All others are much smaller and grouped close to the two rectifier diodes. The symptoms certainly seemed to resemble gradual the break down of a capacitor which has now gone totaly o/c.
    I will obtain the above value capacitor and give it a try. Many thanks once again for your advice.
    Best regards,

  • hengehog Apr 25, 2009

    CTX F973 suddenly started playing up.
    Now I have to remove & replace power lead (sometimes several times) in order to get a video signal to the screen.
    If I don't do this, I get either a white screen or nothing at all.
    Any ideas?




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It is usually the Large Value Caps around any heatsinks etc. in the Power Supply.. I usually simply replace ALL Large Value Electrolytic Capacitors, with same or better temperature ratings. This often fixes any problems.

Posted on Jul 24, 2007

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si quelcun sait la capacité des condensateurs chimiques (eloctrolytic capacitors) situuées sur la carte d'alimentation pour les remplacers ça va nous bien aider à resoudre notre probleme sirtout les condensateurs qui porte sur la carte d'alimentation les n° c 817 ; c820 ; c821 ; c822
merci pour toute aide

Posted on Oct 27, 2008


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