Question about Mag Innovision 19" LCD Flat-Panel Monitor LT916S

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Still "No Joy" with MAG Innovision 19" LCD

Replaced all 470mf caps still "No Joy" !
Question: There is a very large Capacitor rating 400V that has brown stuff on its side where it was folded down onto the board!
Is this some type of adhesive or has this capacitor blown!
Might sound like a really stupid question , but never took electronics courses just learned a few things from my best friends dad when we were teenagers, but back then the Whisper Writer was the latest thing and a company called Atarii came out with a little game called PONG!!

Thanks in advance for any advice, especially whether I should replace this 400V capacitor !

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  • Oscar Brigman
    Oscar Brigman Mar 02, 2008

    don't see a solution only reposts of my own questions!

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Replaced all 470mf caps still "No Joy" !
Question: There is a very large Capacitor rating 400V that has brown stuff on its side where it was folded down onto the board!
Is this some type of adhesive or has this capacitor blown!
Might sound like a really stupid question , but never took electronics courses just learned a few things from my best friends dad

Posted on Mar 02, 2008

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This is a common problem due to capacitors in the inverter circuit going bad. The inverter provides the voltage to light the backlight, so the lamp is usually not the problem.

If you open the case on the monitor (sometimes that's a challenge all by itself) and follow the wires from the backlight to the circuit board, you'll find the inverter circuit. There are normally a couple of transformers (they may be small square cases or round coils of wire on black or gray forms), some transistors, and the infamous capacitors. The caps are small cylinders with printed values on them, like 4.7uf, and also a voltage rating. Most of these are values you can find at Radio Shack, so if you or someone you know has soldering experience, you can try changing them. Stick with the original capacitance value (the uf number), but try to get a slightly higher voltage rating if you can. The voltage ratings come in standard values, like 16 volts, 25 volts, etc. The higher voltage parts will be a little bigger but should still fit. They go bad because the rating wasn't high enough to begin with. But it saves the manufacturer a little money on each unit. Make sure you observe the polarity of the capacitor (plus and minus, with some kind of marking on the circuit board to show you) when you put in the new ones.

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