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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William Miller

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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

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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?

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.

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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.

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Jan 20, 2010 • Samsung SyncMaster 920N 19" LCD Monitor

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The inverter board can be in the power supply inverter board combination,.you should check the power supply for bad capacitors first.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

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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

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Mar 01, 2009 • Samsung SyncMaster 740N 17" LCD Monitor

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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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-Chip

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Nov 22, 2008 • Planar PL2010M 20" Flat Panel LCD Monitor

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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

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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.

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.
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 =)

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Screen Blackness (NOT like all the other ones)