Lcd Monitor Flickers & Goes Black

carlosr23 · Joined: May 02, 2008 Posts: 2

Hi, before anything I would like to thank all of you in this thread for all your excelent ideas how to fix the flickering issue with the FPD1830. A had the same problem yesterday so I followed all the instructions and I changed the four capacitors for 100mf/25 volts and WOW! I came to life again, excelent. It worked for few hours and the it flickered to times and the image wnet off! it went completly black. Now it would turn on (green light or ambar light if there is no signal) but it would stay black, there is no image in the back, nothing, the only clue of life is the red or ambar light.
This morning I replaced the capacitors again with new 4 one of 100mf and 35 volts, it did no change, the problem is the same...

Please any other ideas?

BIG THANKS TO ALL!

Carlos

goretsky

Hello,

I am assuming a green LED light means that a signal is being received by the LCD display. Do you still get a green LED light when the monitor is connect the display to the computer?
If so, look at the LCD monitor from an angle in a well-lit room or shine a flashlight on it. Do you now see a faint image? If so, then it sounds like the backlight has failed and needs to be replaced.

Regards,

Aryeh Goretsky

carlosr23 · Joined: May 02, 2008 Posts: 2

Nope, I don´t see any image, as before I changed the capacitors where I could see the image in the background. I did the test of checking the F1 resistance, just near the capacitors, and it had 12 volts on one side and 0 at the other (I found this in other forum, where the guy had all the same problems as mine). So, taking from that case, and because the resistence is bunded to the converter board and can not be replaced, I ordered a new one (wich in fact, does not have the capacitors any more) from ebay for about US $40, expecting it to arrive en few days so I´ll let you know how it did

thanks for your response

BigHairyBat · Joined: Jun 05, 2008 Posts: 1

Sorry boys and girls, but the problem is NOT with the video card. The problem is within your inverter. I just finished replacing the radial capacitors as suggested by a tech from GATEWAY to no avail. The monitor still comes on for a few brief seconds and then goes black. Something else is keeping the monitor from coming on for more than a few seconds.

My next option is to pull the unit apart and thoroughly check the power supply and all of the connections again. Whatever it is, I'll find it and report back here to you. I do remember a site that sold lcd tubes for $10 each and new power supplies and inverters for $40 on up to $80 if I remember right.

Back at you later with new intel when I have it.

drwho07 · Joined: Nov 29, 2007 Posts: 1546 Location: Central FL, USA

For at least 99.999% of the LCD monitor failures, the backlight power supply is at fault. The same thing happens in laptops and has been happening for as long as there has been laptops with LDC monitor screens. I've replaced many of them.

The biggest problem with many of the new monitors is that they are made in China by the lowest bidder, with the cheapest parts available. Crying or Very sad

Electronic components are under-speced and over-worked and will fail.

For most of those monitors, the manufacturer does NOT supply repair parts to the US Vendors. I've had to throw many LCD monitors into the dumpster because NO Backlight supplies were available.
If you can find repair parts for your own monitor....GREAT, but I'd not want to bet good money on it.

Good Luck,
The Doctor Cool

santo · Joined: Aug 29, 2008 Posts: 1

how did you connect the 470uF cap into the board. Did you just connect to any one of the four locations? Thanks

Bearly1227 · Joined: Feb 21, 2003 Posts: 48 Location: Central MA, USA

I bought two Envision LCD's at deep discount from CompUSA in October 2006 (19" screens).

Both are still going strong. My bride uses hers for digital artwork and I use mine mostly for text based stuff and a little photography picture tweaking.

( Hers replaced and old ark of an 22" Viewsonic that I had bought used from a computer company when I retired in 2002, and mine replaced an ancient 15" monitor by a noname company.)

My one and only disappointment (which my bride has not noticed) is that the pixel resolution "seems" muddled and ill defined. It lacks the crispness of the Viewsonic (22" monitor) but is "good enough" for casual work. I'd hate to try anything serious on it like CAD work. But then again, the Viewsonic alone would probably have cost at least double what I paid for these little darlings.

Bob

PilotBob · Joined: Oct 10, 2008 Posts: 1

After reading all the words of wisdom on how to fix the FPD1830 LCD
flicker problem, I finally gathered up the courage to try and fix it myself.
I want to thank all those who took the time to share their many insights.
The procedures were successful, I greatly exceeded my expectations.
Here is my story, it all went very well, hopefully others can also benefit.

First, carefully took apart the monitor, labeling everything, so I could
put it back together again. Extracted the inverter board to see what
needed to be done. I saw that the capacitors had small nubs on
the reverse side of the circuit board, suggesting holes and legs.
Bought a handful of radial capacitors from Digi-Key, 565-1307-ND,
that matched the specs of the defective ones from sanyo. They
arrived quickly in a 10 pound box and I was ready to proceed.
They had also sent me a copy of their complete catalog!

Now for the next challenge, remove those old capacitors.
I softly clamped the circuit board in the horizontal position,
capacitors were facing downward, nubs facing upwards.
Used a heat controlled soldering iron with a very narrow
point, made sure the tip was clean, set it to 750 degrees.
Heated up the nubs to liquefy while pulling on the capacitor,
alternating between the legs a couple of times. Used my
hands to tug so I could judge how hot things were getting,
and for better control, didn't want to break off the heads.
All four of them came out with relatively painless ease.

So far so good, feeling very optimistic. Next step was to
plan how best to clean up the solder and clear the holes,
which were now thoroughly clogged. First I heated up
the nobs again to liquefy them, and tried a solder sucker.
It did clean up the surface, but only cleared a couple of
holes. I added a bit more solder for more surface area,
and tried this again, eventually had four holes cleared.
Decided to move on to my backup plan. Added solder
to make it easier to convey heat into the holes, I had a
small needle with a ball head and poked upward from
beneath the board as I tried to liquefy the solder on top.
Had to be careful where I was poking, but this was
successful and I was able to open up all the holes.
The circuit board was in great shape, whew. Should
all be downhill from here, the worst part is behind me.
I scraped/flicked away a few last remnants of solder.

Okay, inserted the legs of the new capacitor from underneath.
Soldered each of them on the reverse side (which is the top
side, remember the circuit board is clamped upside down)
Checked the orientation. Made sure I have nice little nubs again.
Lastly, clipped off the excess length from the legs. It didn't look
like it needed it, but to be safe I made sure there were no
accidental solder bridges between any of the new nubs.

Now the monitor was put together again, and powered it up.
Apprehension for a few seconds of darkness, but then pure
satisfaction as the monitor was displaying a perfect picture.
The whole solution cost a couple of bucks and about 2 hrs.

Nathaniel_L · Joined: Nov 20, 2008 Posts: 3

[Message edited by moderator to fix broken link. AG]

Basically the same thing is happening with my LG L1970HR, except it doesn't go black. I made a vid here:

http://www.youtube.com/watch?v=sL2IL89qiP4

It only does it if the monitor has been off for a while.

Bearly1227 · Joined: Feb 21, 2003 Posts: 48 Location: Central MA, USA

[quote]
I have a Gateway FPD1830 LCD monitor that is just over 2 years old. The problems started about a month ago. For a few seconds after I turned the monitor on, the screen would flicker. Then everything would be fine.

About a week ago, I turn the monitor on, it flickered and then went black. The green light remains on showing the monitor is getting power. I can turn the power off and back on and the same thing happens: it flickers for about two seconds, then goes black.

Needless to say, it is very frustrating to try to use my computer like this.

[endquote]

I want to Thank You for this heads up. My own LCD Monitor has been flickering on startup, right through until I have logged in to my account.

When I replaced the LCD monitor with an older Tube type monitor, the flickering went away.

This 19" LCD Monitor (and my wife's) is an Envision 9410e, which we purchased from CompUSA on October 24th, 2006 !

Imagine that. Two years old and warranty out of date.

By comparison, though, my Wife's monitor is not showing this behavior. The one major difference, is that she'd ALWAYs leave the monitor (and PC) on when it wasn't otherwise in use.

I have to wonder, if the power on.off cycles stressed the LCD Driver circuit(??)

Fortunately, I think, we purchased these on "special" sale, $249.95 each, with a $60.00 rebate bringing the price down to $189.95 each.

Bob

OldSchoolGeek · Joined: Dec 10, 2008 Posts: 1

Thanks a ton, Verbage!
I got my caps today, followed the instructions in this thread (the PDF that describes the disassembly process was awesome!) and now I'm working great again.

Anyone without easy access to a radio shack (or who just wants top-quality caps for a really cheap price!) send verbage a PM and get your monitor back!

Nukacola9 · Joined: Sep 02, 2009 Posts: 1

[Email address removed by moderator to prevent spam. AG]

It's about 11pm right now, 3 hours after coming home to find my lcd monitor no longer works. Now I've been across other sites and I'm simply here to find some answers before I go out and do what I must do to repair whatever is the problem.
Now I don't have a smoldering iron however I feel like I have the same problem.
Yesterday or was it this morning, lack of sleep makes it hard to tell but I noticed the monitor was a bit shaky. I mean this by the display itself looked rather dim. I come home from school and find my monitor won't even turn on. Well it turns on for a brief second of display then goes out. The lite remains green and I feel like its the monitor cause the pc itself is brand new, custom built for gaming by a gamer and has worked perfectly fine in the 2 months I've had it. So I'm wondering if this is the same problem before I head out and decide to buy a new one or get mine repaired. If possible, I wish to have a response by tomorrow morning before I do head out. Cause I have a 17 page essay due Friday. Anyways, if the monitor needs repairing. What's the time-frame needed to fix this?

Oh and pls email {redacted}
with any responses. makes it easier for me to check.

el_xero · Joined: Oct 17, 2009 Posts: 7

Quick question guys. What do you think?
I've dug around the net and landed here and this thread seems like its along the lines of what might help out a bit. I've got this Acer H243H monitor bearly 5 months old. Came to turn it on today and here is what happens..

when its got the power cord in the back the montior will have an amber light. Kind of like indicating that it's in stand by. when you press the power light it goes from amber to white and then looks for a signal from its three imputs. Normally it will find one and begin desplaying within a few seconds after showing the ACER logo... however Today it goes from amber to white, i see a fligker of the Acer logo then the screen shuts off and the power light goes back to amber .. then it powers on again. the power light goes white the acer logo flashes for a second and the whole thing repeats....i doubt its a back light.. because it would have at least styed on... I'm guessing its a power supply issue.. what do you guys think? any ideas?

SteveW · Joined: Apr 03, 2007 Posts: 7

Check the manual to see if it has a self-test mode when it's disconnected from the computer, or if it has an On-Screen-Display where you can change the monitor settings. See if the lights stay on while you're doing that.

Then, if at all possible, try the monitor on a different computer and/or try a different monitor on this computer, to try to determine whether it's the monitor or the computer that has stopped working properly. The monitor will turn itself off if the computer isn't sending it a signal.

Did you make any configuration changes recently? Install a new video driver?

el_xero · Joined: Oct 17, 2009 Posts: 7

SteveW · Joined: Apr 03, 2007 Posts: 7

It certainly sounds like something is wrong.

At 5 months, seems likely it is still under warranty. I'd start communicating with whoever provides the warranty coverage (Acer, or the store you bought it from, or both). Be specific about the problem and the troubleshooting you've done, same as you did here in your post.

el_xero · Joined: Oct 17, 2009 Posts: 7

el_xero · Joined: Oct 17, 2009 Posts: 7

Hmmm guess i spoke too soon... it dun it again it did yup Confused

Called up my shipping company UPS.. turns out it will cost me about $250 Shocked

to ship it to acer from my present location... may as well buy a new one.. bugger Confused

oh well.. time to break it open and see if its just an issue of a dead cap or something then. wish me luck guys

drwho07 · Joined: Nov 29, 2007 Posts: 1546 Location: Central FL, USA

Present Location?
Where are you, lower Slobovia? Outter Mongolia? Or, Forgotonia?

Yeah, sometimes you might get them to send you a new one and then take back the old one with a pre-paid ticket.

I had that happen with a UPS from "Cyber Power". It cost me nothing to send back the bad one, after receiving the new one.

Call Acer again, and see if you can work something out with them so it won't COST you anything. Well, that's what I'd do anyway.

Good Luck,
The Doctor Cool

el_xero · Joined: Oct 17, 2009 Posts: 7