Question about LG L1951S (Black) 19 in. Flat Panel LCD Monitor

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Screen Blackness (NOT like all the other ones)

I have seen tons of posts here about problems with the power supply board for LCD Monitors, but the symptoms of those posts aren't the same as this one. When I turn the monitor on, it flickers very dimly for about half a second, then turns off. The green power light turns orange. I am currently holding the inverter board in my hand right now, but nothing appears overtly wrong with it (blown capacitors, loose resistors, etc.) I was previously able to negate the effects of it by turning the brightness and contrast down to 0 when turning the monitor on, but now even that doesn't work.

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Re: Screen Blackness (NOT like all the other ones)

Not all inverter problems will be visually apparent. Some capacitors fail with a high ESR and the only way to check that is with an ESR meter. Output transformers can fail subtly and you may have to test them with an ESR or low-ohms meter, but even that may not be definitive. Parts can be shorted or open without showing burns. It could also be a bad lamp / bulb.

Posted on Jan 22, 2007

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What problem would make the screen go black with vertical rows of hash mark down each side of screen?

ael 16504, If unit performs in same manner when connected to a "Known-Good" pc, then unit may need to have the internal power supply board (SMPS/inverter) checked out by you or qualified monitor technician. What is "date of manufacture" and model number? Have you seen any repair videos at YOUTUBE yet??? Was monitor working good 24 hours ago? Will your pc perform perfectly with a different monitor connected to it? When very "strange" stuff starts to occur with CCFL lcd monitors, the very first place this tech will look is at the SMPS/INVERTER power supply board. Do your research here in the fixya profiles of "budmrtn" "buddymc" 12fixlouie"(me) and at YOUTUBE for video clips of monitor power supply board repair (bad capacitors)
Report what you discover by doing another posting to this response by me. 12fixlouie

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Where can I buy a power supply for an AOC LCD monitor model TFT 1780?

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Revert back for assistance.

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theres only one solution to the problem you have to replace the whole power supply board .its easier to replace them than finding and soldiering the defective parts like the capacitor on the board .u can just replace the power supply board if u think the power has a problem. if it doesnt work then u have to replace also the main board or the board connecting the rgb cable.its more expensive to replace the board but its worth it. ur lcd will work better and its easy to put them on the lcd casing .

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This may be related to a power supply problem that these monitor have. I think you need to fix the power supply board inside the display itself. It's giving the logic board and backlights fluctuating power and they have weird / intermittant problems.
There is a supplier of power boards online, you can google them with numbers from the board but I don't suggest using them. Look for information on the company before you buy from them. I've seen a lot of complaints for this "international" company.

First check that you are getting a strong 12V from the external power adapter. If so, the problems may be as simple as changing out a few capacitors. (about $8 in new capacitors, plus shipping)

On the PL2010M monitors you need the following parts. I've added digikey part numbers to make life easier:

P10271-ND 220UF 25V Capacitor (3 or 4 depending on PS)
P10275-ND 470UF 25V Capacitor (1)
P10221-ND 470UF 10V Capacitor (4)

If you're not comfortable with soldering and de-soldering electronics, take it to a local technician for the work and give them the parts list above. That should work to fix your issues. I've fixed several of these monitors so far. All the problems were related to the power supplies having bad capacitors. Same with the Planar PL1700 LCD monitors.
There is also a single capacitor on the display logic board, but I haven't seen this one go bad yet.
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I saved a ton of money fixing this, it's definitely worth learning how to solder to do this. for professional hosting solutions

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1 Answer

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This is a problem I have seen with a few LG monitors.
Your Inverter circuit is fine (that powers the lights to your screen so you can see the image on the LCD panel) but the monitor does not like having a video signal attached to it.

  1. Bad capacitors on the power board can upset the current going to the controller board. This board included the video input circuit and the power supply needs to be stable for this to operate.
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Hope that helps =)

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