Question about Planar PL170M 17 in. Flat Panel LCD Monitor

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Hello, The model is PL170M Planar. The monitor displays a black screen, however, the on light is lit and I can hear sound but no picture. I have followed the troubleshooting instructions. Please help! Thank you, Beverly

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If you are certain that it is not a simple problem like your screen brightness being turned down too low, then this is usually an indication of a hardware fault on one of the circuit boards inside your monitor.

I am assuming that the screen is dark and unlit while the power is on, rather than lit up but without a picture signal. Please confirm if that is the case.

In most cases (well over half the time) this symptom is caused by some bad capacitors on the power supply circuit board which results in the backlights not receiving adequate power to light up.

It could also be a bad surface mounted fuse on the inverter circuit board, but that is slighly less common.

Either way, the problem is interfering with the correct operation of the backlights in your LCD monitor resulting in the dark screen.

If you are handy with a screwdriver and a soldering iron, you may be able to disassemble the unit and check the various circuit boards for bad components. The main thing you would be looking for is any scorch marks or burned components. When electrolytic capacitors fail, they usually expand slightly and bulge out their normally flat tops or leak out brown gunk. There should be a bunch of these types of capacitors on the power supply board and you would want to give them a very close inspection for damage while you are in there.

However, I am completely unaware as to your ability or desire to carry out any kind of electronic troubleshooting yourself. There are some obvious electrical safety precautions to take into consideration, and even when the unit is unplugged, there are still some components inside like the large capacitors which can remain significantly dangerous.

I wil include a link to another expert's solution to a silmilar problem which includes links to his excellent LCD Troubleshooting Guides. You can read through those if you like, to give you some idea of the troubleshooting and repair process. Please give BUDMRTN a thumbs up rating on that page if you find his information helpful.

Please comment back here to this page with any questions or additional details you can provide for me and I will respond as soon as I see it.

Thank you and good luck.


Posted on Apr 01, 2011

  • Joe2
    Joe2 Apr 01, 2011

    If you are unable or unwilling to carry out the necessary electronic troubleshooting or repair procedures yourself, then you will have to carefully weight the cost benefits of spending money getting the unit repaired at a shop.

    Normally, you are looking at a minimum charge of about $50 - $60 US to have a technician open up your monitor for repairs. Given the fairly low cost these days for a brand new 17 inch monitor, I'm not sure any significant repair at a shop would be cost effective for you. Especially considering a brand new monitor will come complete with a warranty, while your repaired unit would still have most of the same old parts in it just waiting for their turn to give up the ghost.

    Unless the solution involves just swapping out a few bad capacitors or something simple like that, then it is often not economically feasible to have smaller monitors like that sent out for repair.

    Just a bit more information to consider Beverly.

    Good luck.




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