HOW-TO:
Fix a faulty LCD Monitor Power Supply
Problem: You have a LCD monitor that either does not turn on or turns on and off randomly. There might even be a high pitch squeal when it is on.
Solution: Replace the power supply of the monitor.
Options:
1) get a new monitor (cost: too much)
2) get a new power supply (cost: too much, that is, if you can even find one)
3) FIX IT YOURSELF (cost: FREE)
I will show you how easy it is to fix it with the scrap parts you already have.
I received a FREE lcd monitor (remember the cost) that would turn on but after 15 minutes or so would turn back off and would not turn on unless it was unplugged then plugged back in. After opening it up, I noticed there was a bad capacitor on the power supply. So I dug through all my spare components to find an identical (rated) capacitor.Fix a faulty LCD Monitor Power Supply
Problem: You have a LCD monitor that either does not turn on or turns on and off randomly. There might even be a high pitch squeal when it is on.
Solution: Replace the power supply of the monitor.
Options:
1) get a new monitor (cost: too much)
2) get a new power supply (cost: too much, that is, if you can even find one)
3) FIX IT YOURSELF (cost: FREE)
I will show you how easy it is to fix it with the scrap parts you already have.
When I got it changed out and powered back on, it still had a high pitch squeal and random power problems.
So I just replaced the whole power supply.The power supply of the monitor had 6 connections. 3 ground, 2 12volt and 1 5volt. I have several old computer power supplies, so I used one of them (cost: Free)
All I had to do was strip it down to what I needed.
Next I mounted the PS on the back of the monitor. Using the existing mounting points (for wall mount) 
Make some custom connections (cost: Free), so the monitor can easily be taking apart.
Connected it all together and fired it up.
Now I have a working LCD Flat Panel Monitor for a total cost of $0
113 comments:
fabulous! Your photos and step by step process is easy to follow. Great Job!
Featured on Hack a Day no less. You'd have to be, considering the screenshot. Props!
How did you know it was the power supply and not a coil? I have a LCD monitor that works, but the CCFL lights do not turn on. I check the voltage going to them and there is none. From there I'm lost, could be the PCB board, coil, or any component of the power inverter board, or could be a PSU issue. Thanks for any advise.
Ugly as sin, but darn that's cool. Good job on the scavenging. Looks very much like my diy bench psu.
@Matthew
funny enough i currently have my friends old monitor that has same issue.
i had 3 ideas...
check every component and replace the broken ones (mostly check the capacitors they are usually the biggest culprits)
replace the ccfl tubes with white leds and use the pc psu to power those as well
i have some ccfls that went inside a pc these have little powerblocks that take 12v so try plugging those into the ccfls of the lcd
otherwise hacking it and turning it into a projector or other interesting project for teh win! :-)
Unfortunatly my monitor has the CCFL inverter on the power supply board too.
Maybe the CCFL tubes could be replaced with LEDs...
The power supply you used, how did you start it up, I thought these were newer power supplies get there signal to turn on from the motherboard of a computer, or is it on all the time? I have a hack for a single voltage dc power supply but am curious about this one, a little more info will be nice
Aztraph:
I'm assuming he grounded the signal wire for the power supply (quite easy, all you need is to jumper the green wire on the connector to a black wire) and uses the switch on the PSU to turn it on and off.
As for the voltages, it's quite easy to get those voltages off a power supply, this is where your multimeter comes in handy. ;)
Wonderful! Now, if only I had a broken LCD monitor to try it on... But that's what Ebay's for, right?
If you all have an extra XBOX (original) lying around you could use the PSU from that... might take some readjusting but it looks like it could fit! Good job dude!
Props to ya. Now thats a hack that makes sense and the instruction is good. I think I will rummage for a monitor just for fun. Thanks again..
nice! i've got big plans on trying this with a 15" that had weird backlighting issues and then died.
thanks for the ideas.
any idea how much current you are drawing on the lines of the now external power supply? if it's not over ~100 watts, you could put a "pico psu" in it, and run it off of 12 volts.
pico psu (and other cool mini computer items)
http://www.mini-box.com/s.nl/it.A/id.417/.f
I Dumpsterdived 2 broken flatscreens a few months ago.
Your Hackaday got me triggered to dig them out from the not to stabile Pile of junk that barely keeps from falling off my shelf.
the Philips s170 was not powering up,
after a quick control with my multimeter, I found that the connector for the powercable was loose and broken off.
After soldering on a new power cable, I found myself as a proud owner of a very free flatscreen.
the 2nd sceen, an Eizo with a faulty powersupply, will be fitted with a atx PSupply tomorrow.
Thank You Plentiful..
Dr.No.
Holland
I guess that it isn't a flat panel monitor anymore. you need to do something about that.
The ATX PSU you used was quite poor.
For an expensive LCD monitor I would've used something better. It doesn't even have any mains filtering section or PFC at all, not good if there's a mains voltage spike or surge.
Instead of mounting the PSU on the back, you could've put the PSU board in the screen in place of the old one.
I, personally, would have further checked the original PSU, not just replaced a capacitor. Check voltage regulating zener diodes / resistors / semiconductors in the secondary.
I need to do this, would it be ok to cut the fan out ?
I had a HP 19 tft power supply go and it cost me $50 from local repaier. Not to dear for a $400 monitor.
I connect the remote wire with a black ground wire but the PSU still does not turn on. Am I not doing this right? I assumed by "jumping" you meant connecting...lol.
Thanks
bwahahaha...i've fixed quite a few by board swaps - one had bad cpu, another PS, that way I get a working monitor.
worth a try. BTW the capacitors that go are usually 1000uF 16 or 25V, change all of them even if they look OK, the ESR skyrockets.
i have one here which is cycling (tweet tweet), probably the same fault. also change the two smoothing caps on the inverters as these go as well.
Panel faults:- change panels. They arent usually fixable but sometimes if the internal Vcc fuse has blown due to a bad cap it can be replaced. Coloured lines usually means a blown controller or a cable fault.
Bad coils can squeal but its normally caused by an overload. Check for partially shorted secondary components such as flaky inverter transistors (normally C5707 on Benq/Dell monitors), change all even if all but one test fine or you will be revisiting your handiwork very soon ;-)
regards, A testing_h@yahoo.com
Nice. Looks like 12-0-5 was enough? You might have found some fanless supply (even an external brick like an Amiga psu) with enough power for little looking around, but of course you can't beat what you already have and don't need in price :)
Great idea!
But remember! If your LCD not turns on at all, it is very often a surface mounted fuse in the power supply that is broken. I have now 2 monitors fully working by soldering a short over this fuse.
this inspired me to finally dig out the "dead" LCD that's been under my desk for 2 years and take another stab at it. The inverter was suspected bad, and a refurbished replacement lists for around $99. On a whim i replaced the 4 capacitors on the inverter board and it worked!
So if you have a Gateway FPD1830 just get 4 25v 100uF caps and give it a shot!
I have a monitor that appears to overheat and turns off after 10 mins (then less time depending on how long I leave it off). I have blown a desk fan over the power board and it stays on just fine when cooled. Do you know what the fault is, e.g. capacitor etc? Thanks Andy.
I have a monitor that appears to overheat and turns off after 10 mins (then less time depending on how long I leave it off). I have blown a desk fan over the power board and it stays on just fine when cooled. Do you know what the fault is, e.g. capacitor etc? Thanks Andy.
I would run wires from the power supply in your pc next time. No extra pwr cord and less space taken up on ur desk. Keep that extra pwr supply around for another project.
i have a dead screen psu but the voltage is 12v ok 5ok 3 ok but it has a 1.5v how do i get that off the PSU
Great post. My 1000uf PS cap was whining, and will need replacement. Unfortunately my PS also has 4 720VAC connectors for the backlights, so i'll definately need to use this PS.
'steve
I though my monitor fix was ghetto...
:D
This goes above and beyond mine...
http://preview.tinyurl.com/52y2a4
Hey I can get replacement universal supplies for anyone who wants em, for only $65.00 plus shipping.
Plus keeps em flatscreen size too!
dave@computersathomeusa.com
gay y not lern to fix the bord what a shame
learn - not lern, use the built-in spell check - what a shame
Shopping the cheap battery,you can see from here.
Fix that LCD is very great this monitor.
What a great this panel monitor is very nice screen colour.
Wow very recommended step by step process I like your post, I'll stumble for you ...
Very smart lcd repair steps. You are great. Thanks!
Nicole Xcite Gamer
I really enjoyed the way you put this together- Will this work on an ipod mini?
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I've got a 19" lg flatscreen that flickers when it is turned on. Is this an inverter problem or does it need a new backlight. I've managed to resurrect other lcds but this one has me stumped.
Any advice would be appreciated.
I have stacks of lcd monitors that need backlights. My problem is that there no screws to open any of them. I am told that I need a key to unlock the case. How can I do this without a "key"?
Thanks,
Doyle
nice post
Freakin awesome FINALLY someone in this world taking control of this situation with a kick-ass no-cost fix for something all the manufacturers would want you to just replace with a new one. Great stinking pictures too! I hoep & pray many more fixes are posted in this manner in the years to come!
Replace the power supply with such an ugly open box?
great post, and for those of you looking for old non-working monitors, check your local recycling center. Reuse is one of the three R's right? ;)
one person on here said something about a Power block used for CCFL's on a case. My curiosity is I had a power block with either a 2 or 3 pin for the CCFL on the case and the monitor connected to its original PSU through a slim 4 pin connection. any Idea's on if that would work?
I have Samsung 22" wide screen and the PSU have a 13.5vdc and four connectors that is pushing 700vac. Does the pc PSU have that capacity?
Thanks
I have a hack for a single voltage dc power supply but am curious about this one, a little more info will be nice.
hi its simon from malta.i have 17'' lcd for pc.and its not switching on.what u think is the problem pls?
best thing to do is to find the bad part inside the smps and change
it .that is all
beh
THANKS YAR U R DOING VERY BEST JOB THANKS
Thanks, have you tried an external hard drive power supply? Might not have enough power?
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I know this post is years old but I just wanted to say thank you so much. I had a dead Dell 1800fp and I've just brought it back to life by hooking a computer power supply into it just like this. I never would have thought that something like this would actually work, but it did!
Me!
What about the monitors with power supply that has the circuits for the backlight? Does this solution work?
I suggest this site to my friends so it could be useful & informative for them also. Great effort.
Always so interesting to visit your site.What a great info, thank you for sharing. this will help me so much in my learning.
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It's never been costly to fix LCD flat monitor. Thanks to this post, it has shown helpful steps. But it would be more understandable if screen-shots were visible.
You are awesome, I will be doing this weekend as I scored one at a garage sale that has the exact same problem.
Great. I am sure, I will tweet this to my twitter account. This will help a lot of users.
Nice tuitorial but with the price of LCDs these days it would probably be easier just to buy a replacement, you can pick up a refurbished monitor for next to nothing
If the inverter circuit is in power board, how to fix with the external power like this.
With this setup, can you still use the monitor power button, and adjust contrast, etc?
Thanks for the photos. I'll use one to let folks know how a redneck fixes problems.
Great job there!!! Thanks for the images that you've included, this makes your article more graspable and easy to follow too.!
THANKS.
BEST IDEA AND JOB.
BUT WHAT ABOUT 1.5 VOLT SUPPL ?
PLEASE DEFINE THAT.
DULAL
very brilliant idea, i use instead a laptop adapter that has a 5-12volts output..look for one that has a 4 to 5 amperes rating..most newer laptop adapter are 19volts 4amps, you have to build/assemble a stepdown voltage regulator for your 12 and 5 volts output using a 3 pins 3 amperes voltage regulator i.c. just Google the schematic...
great job
I have a problem, looks like inverter on my lcd is integrated with psu, is there any way to solve that?
How did you know it was the power supply and not a coil? I have a LCD monitor that works, but the CCFL lights do not turn on. I check the voltage going to them and there is none. From there I'm lost, could be the PCB board, coil, or any component of the power inverter board, or could be a PSU issue. Thanks for any advise.
It’s glad to see good information being convey. Its a very nice written, and i really like these blog. Thanks for the info.
Great post, I admire the writing style :) A little off topic here but what theme are you using? Looks pretty cool.
Wow. Beautifully described the whole fixing process. Just love your work and your efforts are really appreciable.
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sorry to bump thread but i have an lg monitor,,,, where can i draw power for the high voltage connectors.... any insight would be great thanx
LCD is becomes more popular nowadays.
Good article. Thanks to share!
Thanks for the information, I really appreciated the read.keep it up.
Good work man. Thanks for the Nice and complete review.
Lcd laptop screen
Thank you, thats very interesting information. I need to share with my friends.
You can also try this this one, LCD Backlight conversion to LED, I just found this on the while Im searching for the alternative solution of a defective LCD backlight which is the cold catode flourescent lamp(CCFL.
http://www.rondownload-repairguide.tk/2011/08/lcd-backlight-conversion-to-led.html
Interesting and. It important information is really beneficial for us. Thanks
Thank you for this great information, you write very well which i like very much. I am really impressed by your post.
Thank you for another essential article. Where else could anyone get that kind of information in such a complete way of writing? I have a presentation incoming week, and I am on the lookout for such information.
I have found your blog to be quite useful. Keep updating your blog with in valuable information... Regards
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Wow, well done! This article is very useful for me. But now I want to talk about Leoch International, a manufacturer of lead acid battery, which supply ups battery, gel battery, vrla battery, and so on. Their automotive battery are very good, which are compatible with many models of cars. Besides, the golf cart batteries have several kinds of voltages to meet your demand.
Hello..nice job...
can i have ur manual...i wanna try it on my lcd...which cable should get rid and which to connect with lcd board...u can email me...huhuhu...
boyahensem@yahoo.com
I have been meaning to read this and just never got a chance. Its an issue that Im very interested in, I just started reading and Im glad I did. Youre a wonderful blogger, 1 of the most effective that Ive seen. This weblog undoubtedly has some facts on topic that I just wasnt aware of. Thanks for bringing this stuff to light.
Thanks for that post! We are glad to find someone who puts a lot of thought into their blog instead of just throwing up a bunch of junk!
Thanks for the information and its good i will share these content among social media.
Thank you for bringing more information to this topic for me. I'm truly grateful and really impressed.
Does this work for other monitors like Hp? I have HP w185 monitor which doesnot turn on. I think its the power supply. Can u help me with it? mail: bkey_mhj@yahoo.com
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Good blog lots of useful information found here.Thanks for this great post.
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very impressive.....
Nice work, I have some projects of my own, take a look
http://www.shareyourknowledgesite.org/
how is possible?
Good Stuff, keep the wheel spinning
Regards Humphrey
Your post really helpful for my Flat Panel Display Market Research and Development.
Your post is excellent with nice photographs. Every one can understand easily.
Nathan,
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Very Good! I found your your posting, but destroyed my monitor trying to take it apart. I will know better next time.
Nice job will done, a very useful information but it looks like bulky on the back of the LCD Monitor but you did a good work, keep it up.
Hey, MacGuyver called, he wants his monitor back. lol Good job, man. Little bulky, but, who cares for $0?
Really fantastic article regarding the project. I just really love it. Thanks for making a wonderful share!
Thank you so much for more information to this topic for me. I'm truly grateful and really impressed.This is a grate blog to showing a step by step information of LCD monitor.
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Hello, nice post. But i have a question, and if the inverter is on the power supply board, how do i fix it?
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