Question about CTX Multimedia Series 2900 (Black) 29 in.CRT Conventional Monitor

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Black screen in my CTX MS2900VS TV monitor

Hello,

Suddenly I began smelling frying odor then the screen went totally black and when I pass my hand over the screen I don't feel the usual electrostatic surge. The tuner can still detect channels but I can only hear the sound and pull the picture out to a video capture card. I cracked the box open and found a leaky capacitor C106 100uF/250V/105C that I replaced but the screen is still black. The cathode light turns on so I feel that there's something going on with the HV circuit. I'm not at all a TV expert but I feel that the flyback transformer is fried. It had model # TLF222A-31K1-72 written on it. Am I correct? Does anyone know where to find this part?

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If the flyback has failed, it isn't alone. If they break down inside, they will destroy the horizontal output transistor; largish plastic part mounted on a heatsink next to the flyback. If your set was built between ~2003-2006, you may have many more defective electrolytic caps and some of them are responsible for feedback tasks in several circuits and these defective caps lose value much sooner than those made with quality dielectric fluid. The bad fluid was used by many Asian companies and was made in China from a formula stolen from Japan and then modified to save a few yuan. There is no visible way to identify the affected parts other than measuring them with a capacitance meter since they don't always 'bleed' when dying.
You really also need an inductance meter to determine if the flyback is bad (special testers for these were once made but no more) and even then, it is questionable whether you can find one to buy.  All the suppliers I once used are defunct.  

Posted on Oct 11, 2008

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