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

4 Answers

Mag LT916S Blank screen after start up

Like others here I start my computer and turn it on, and everything looks fine for about 1/4 of a second and then it goes black while leaving the power light green. I can only see the screen again after turning it off and on, but that's only for another 1/4 second. I followed what was listed here. http://www.fixya.com/support/t122207-monitor_deosnt_turn Monitor worked for 20 minutes then shut down again. Now you can only get it to work for 1-2 seconds. Please help.

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  • denada777
    denada777 Sep 19, 2007

    already did that. have the old sony lcd hooked up right now. works great, just smaller

  • denada777
    denada777 Sep 21, 2007

    Last assistance was no help at all. It's not the computer.........it's the monitor....
    Please help

  • denada777
    denada777 Sep 22, 2007

    so are you saying that i need different caps with the original temp rating?

  • denada777
    denada777 Sep 22, 2007

    need more help

  • denada777
    denada777 Sep 25, 2007

    Maybe you can explain this. Before i replaced the caps the monitor would only stay on for 1-2 seconds. Since I replaced the caps(lower temp and higher volt) it will stay on for 20 minutes then reverts back to the 1-2 seconds.

    If I replace the caps with the proper temp and volt should that fix it or do I have additional problems.

    Please keep in mind I am a novice so talk to me like I'm a 4th grader.

    Thanks

  • denada777
    denada777 Sep 25, 2007

    Maybe you can explain this. Before i replaced the caps the monitor would only stay on for 1-2 seconds. Since I replaced the caps(lower temp and higher volt) it will stay on for 20 minutes then reverts back to the 1-2 seconds.

    If I replace the caps with the proper temp and volt should that fix it or do I have additional problems.

    Please keep in mind I am a novice so talk to me like I'm a 4th grader.

    Thanks

  • denada777
    denada777 Sep 25, 2007

    Maybe you can explain this. Before i replaced the caps the monitor would only stay on for 1-2 seconds. Since I replaced the caps(lower temp and higher volt) it will stay on for 20 minutes then reverts back to the 1-2 seconds.

    If I replace the caps with the proper temp and volt should that fix it or do I have additional problems.

    Please keep in mind I am a novice so talk to me like I'm a 4th grader.

    Thanks

  • denada777
    denada777 Sep 28, 2007

    need more answers

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4 Answers

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Ok now i will specify the exact value capacitors..Get them and also a new LCD inverter board Capacitor specs: 470UF 25V 105 DEGREES C (MEANING 470 MICRO FARAD/25 VOLTS) HAVE A BOLD LINE RUNNING UP ON ONE SIDE INDICATING THE POLARITY. BOLD LINE SIDE IS "-" SIDE WITHOUT BOLD LINE ITS "+" THE POWER SUPPLY BOARD HAS THE POLARITYS STAMPED ON THE BOARD ITSELF UNDER EACH CAPACITOR. EASY 30 MINUTE FIX IF YOU ARE LEARY ABOUT SOILDERING, FIND A FRIEND THAT KNOWS HOW TO Try this and if it wont work try getting a new LCD inverter board...click the link below http://www.pchub.com/uph/category/43/LCD-Inverter.html PS:Check your monitor's board and get the same one.You need not worry if it is suggested for someother monitor as long as you get the same board! Happy FIxing!

Posted on Oct 10, 2007

  • eagle338
    eagle338 Oct 10, 2007

    If you cant find the 25v then 470UF/35V 85 DEGREES C will also do.They might not last as long as 25v ones but it should work pretty fine for abt 4-5 months.Considering the fact that you get them for less than 1$ a piece to 2$ each you have hardly anything to lose!

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Guide2u is correct! try to use a good monitor to confirm first!. and i think you have fault oscillation in power section! maybe you have defective parts! or change value resistors or capacitors!

Posted on Sep 23, 2007

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The root cause of a PSU failure maybe something like a fault with the backlight inverter. If the current draw is high but just under the PSU shutdown point then the PSU can run really hot. The increased voltage rating of the new caps will not compensate for their lower temperature rating if the PSU is running very hot. Theres an scary article here about the construction of cheap PSU's from China that do not meet the stringent safety standards of the west. http://www.electricstuff.co.uk/acadapter.html I think PSU's are awful things just waiting to burn your home down. I always unplug mine after use because the power buttons on most equipment these days does not remove the mains from the input to the PSU. I sleep better that way. Please be careful.

Posted on Sep 22, 2007

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  • Martin B
    Martin B Sep 23, 2007

    The temp rating of the capacitors should not be too low if they are likely to be in a very hot PSU or if they are carrying heavy current pulses which can heat them.

    If their temp rating is exceeded then they just wont last as long or worse may eventually bulge or pop open (messy).

    It would have to be a really, really hot PSU (like the dodgy PSU web page example where the temp exceeded the cap rating).
    Too hot to touch the case.

    The voltage and temperature ratings on the capacitor label are typically 50% below instant failure levels. They are recommended maximum figures based on a decent lifespan of a few years.

    Best bet is get your PSU working, make sure the monitor is ok with it and run it for a few hours while every now and then feeling the PSU case. 50c is about the temperature where you will start to feel pain. Its a pretty accurate.

  • Martin B
    Martin B Sep 29, 2007

    denada777,
    What is the rated voltage/current of your PSU?

    My 12v LCD TV PSU went wrong and I proved by hooking the TV up to a car battery(with a fuse rated the same as the PSU).

    Interestingly when the battery started to go flat after a few hours the backlight went out at 11.5v but I could see the LCD still working and there was sound.

    What I am getting at is that you still dont know whether the PSU is being overloaded for a split second during operation and the PSU goes into paralysis as it should do.

    When the monitor fails, does the voltage drop on the PSU output?

  • Martin B
    Martin B Sep 29, 2007

    You'd need to measure this while it is still connected.
    So run it with the case off and the voltmeter connected to the output solder pads.

    Take care!

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  • 461 Answers

How do you know that your LCD is the real root cause of this issue? I suggest you try to use a KNOWN GOOD MOnitor/LCD to confirm it first.

Posted on Sep 19, 2007

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Posted on Jan 02, 2017

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