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

2 Answers

Monitor went Blank / Black (MAG Inov...lt916s)

Replaced capacitors witth ones of same ratings / voltages !

Picture came back on for 1 minute then quit again! replaced capacitor but now will not power up at all?

Any suggestions ?

obrigman@nc.rr.com

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  • Oscar Brigman
    Oscar Brigman Feb 20, 2008

    Thanks for the information kishkane. Will try your solution this weekend and post results, having to pull double shifts at work so Saturday will be the when I can get to it, but that does sound like it could be the problem ! Again thenks and I'll let you know!

  • Oscar Brigman
    Oscar Brigman Feb 22, 2008

    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 !

×

2 Answers

I had to replace the inverter's capacitors as well. Started working right away - smoothly. Note: the old caps didn't leak or had any other visible defect - replaced them anyway.

Posted on Feb 21, 2008

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  • 198 Answers

Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
Good Luck!

Posted on Feb 20, 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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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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Sounds like an inverter problem. If the power supply is internal replace the capacitors coming out of the voltage regulators. These are usually 1000mf and/or 470mf. If that doesn't do the trick look up the numbers on the 8-pin chips that drive the secondary transformers on the inverter to see if they are getting the right voltages.
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