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

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

1 Answer

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.

Posted by MASON PURKISS on


1 Answer

William Miller

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points


    An expert that got 20 achievements.


    An expert that got 10 achievements.


    An expert that got 5 achievements.

  • LG Master
  • 9,179 Answers

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


Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:


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

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

hi, i don't know if you will ever find just the power supply board for this monitor. i repair lcd monitors for a side business and i have never found the exact power board i needed for any of the monitors except for dell 17in. you would have to look on ebay for another broken monitor just like your with a working power board, broken screen maybe. that being said, why do you think you need a power board complete? the parts on the board are replaceable. maybe you could post a reply so i can read to help with what the symptoms are and help you diagnose the problem components? if you posted pictures in your reply of both sides of the board, it might help me describe more in depth.

Power on/off not respond, what can i do ? my screen Samsung SyncMaster 920N

This may due to power supply is not connected properly or power supply itself gone bad. check and repair/replace the power supply may solve your problem.

Revert back for assistance.

Lcd monitor problem

The inverter board can be in the power supply inverter board combination,.you should check the power supply for bad capacitors first.
Please post back what you find.

Daytek lcd monitor model LM190

starmaxpc, Yeah, at least part of your switch-mode-power-supply is working! That's a good sign. Go visit these sites and see if you could do same. http://forums.pcper.com/showthread.php?t=452974 and pkrobot.freehostia.com/LCDRepair5.htm also try http://www.net/blog-entry/specialed/2008/12/31/how-to-fix-your-broken-lcd-monitor then get back to me if you intend to repair this DAYTEK LM190. Also there is a ton of other stuff that relates to failed power supplys in LCD monitors. Even YOUTUBE has a whole ton of stuff! Even disassembly videos of lcd monitors!
Bye for now. I'm louie12fix on fixya, or [email protected] aol.com


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 .

Planar 2010M auto adjust

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.
Good luck!


Cannot see Screen contents

I fixed it! It's the power supply board.

The Westinghouse LCM 22w2 has bad capacitors on the yellow power supply board. This is a common problem plaguing motherboards and LCD flatpanels that use capacitors from Taiwan. If you know how to solder, or know somebody that can, it's actually a pretty easy fix. Take out the yellow circuit board on the inside, write down the specifications for each of the capacitors (the cylindrical things) go to the electronics supply store and get the replacement capacitors. You can go over the voltage specification (not under), but keep the capacitance value matching. Replace one at a time. Go to www.badcaps.net for advice, tutorials and training on doing this. *You really should replace all the capacitors*, but the very large one next to the power plug I did leave on the board because I couldn't find a match. To my delight, it was working as new!

I saved a ton of money fixing this, it's definitely worth learning how to solder to do this.

www.ctcco.com for professional hosting solutions

SDM-HS73P Screen Flashes

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.
  2. The controller IC that translates the video signal into what the LCD panel controller can understand is failing. Normally this fault occurs in the horizontal and vertical input of the IC. The fact you can see the other message on screen is due to it going through it's own internal and seperate section of the IC. In this case the only repair option is to replace the internal video board. Sony will not supply the parts directly to the public, but if you are really nice, they "may" tell you where to get one externally to Sony.
Hope that helps =)
Not finding what you are looking for?


Ask a Question

Usually answered in minutes!

Top LG Computers & Internet Experts


Level 3 Expert

13435 Answers

Cindy Wells

Level 3 Expert

6446 Answers

Brad Brown

Level 3 Expert

19008 Answers

Are you a LG Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides