Question about ViewSonic VE175b 17" LCD Monitor

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My monitor stopped working

How can I fix it ? Is it power supply or or something else?

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  • LINAKHL Jul 06, 2008

    NOPOWER AT ALL HOW TO OPEN THE MONITOR COVER TO ACCESS THE POWER SUPPLY.

  • Anonymous Oct 09, 2008

    There is power to the monitor as the pwer light is ON on the monitor but there is no image on screen. If I press power button OFF on monitor and then press power button back ON I see the monitor and image on screen for just a sec and then monitor screen goes black.

  • pattykakesda Dec 27, 2008

    my monitor does the same thing. I power it on and sometimes you get a image and sometimes you do not. After turning it on and off a couple of times you get an image, but if you have to re-boot for any reason, again no image.

  • Anonymous May 14, 2009

    Sometimes after the monitor has been on the picture goes completely blank and I have to turn it off then on again to get the picture back. What is the problem?

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You need to be more specific .Post make, model, how old it is and exact problem.Is the monitor completely dead No lights power etc??

Posted on Feb 17, 2008

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No power totaly dead lcd monitor viewsonic VA702b model # VS10781,,,

Posted on Aug 09, 2008

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1 Answer

Do you have Schematic for my monitor


Hi
Dont think they are available any more. It's becoming a throw away world.
I used to fix them.... without a schematic. Your local TV technician can often assist with repairing an older style monitor. e.g. CRT tube type.
Modern monitors are LCD & digital electronics. Although they still blow fuses & have switch mode power supplies with leaky electrolytic capacitors that stop the power supply from working.
If your knowledgable in this field then I would start with a visual of the power supply. Be careful of the shock hazards.

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Power supplies tend to be either working or not working. I would start with the computers memory, reseating the memory cards (there are plenty of tutorials on the web for how to do this). If the power supply fan was running, chances are you did not need to buy a new one. Does it do the same thing with the new power supply?

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If there are lights try seeing if you can replace the data cable from the monitor to the computer. If that doesnt work then you will want to look into getting a replacement.

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This is the explanation according to the service manual.

This is a system fault error condition, including the power supply. Only the +5VSB rail on the power supply is working correctly.

  • Ensure all power cables are securely connected to the system board.
  • Ensure the main power cable and front panel cable are securely connected to the system board.
note.gif NOTE:
If the system was abnormally turned off, you need to disconnect and plug in the AC power cord. Then turn on the system. Otherwise, you may see an incorrect power light state.

You either have a bad power supply or something is shorting out your power supply. Disconnect all devices from your computer except the monitor, keyboard and mouse. Also check your USB ports to see if any are damaged.

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If the computer is attached properly and you get the flashing lights it is due to switch mode power supply being faulty, too expensive to fix I think you will find, never seems to be anything like just a fuse I'm afraid, modern worlds tells you its time for you next monitor..... do try to ensure it aint the pc by hooking laptop or something else to this unit, or hooking another monitor to your pc to be sure but I find power supply failure is normally how monitors leave this world...

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Definitely some electrolytic capacitors are blown inside the monitor in power supply module. Open it and observe any of them rounded on top, replace with proper ones.
You see, controller operations with VGA and DVI inputs takes different current from the supply, that's why it may take different time until PWM chip in the power supply will decide it is time to shut down before getting smoked.
Replace capacitors.

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These are all some component failure problem in the monitor circuits. This may have been caused by faulty components or overheating of the components causing intermittent or permanent failure of some components in the circuits.This causes the feedback circuits to sense incorrect voltages or currents in the circuits and turn on the protection circuit. It may also cause total failure of the power supply circuit and a loss of power to the monitor. These units should be returned to dealers for servicing. Hope this helps you .

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