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
32 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
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