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Saturday, January 26, 2008

Fix that LCD Flat Panel Monitor

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.
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




118 comments:

bayith said...

fabulous! Your photos and step by step process is easy to follow. Great Job!

Anonymous said...

Featured on Hack a Day no less. You'd have to be, considering the screenshot. Props!

Matthew said...

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.

Pants said...

Ugly as sin, but darn that's cool. Good job on the scavenging. Looks very much like my diy bench psu.

Timmeh said...

@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! :-)

Anonymous said...

Unfortunatly my monitor has the CCFL inverter on the power supply board too.

Maybe the CCFL tubes could be replaced with LEDs...

aztraph said...

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

fearthesiigna said...

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. ;)

Josh said...

Wonderful! Now, if only I had a broken LCD monitor to try it on... But that's what Ebay's for, right?

Conor said...
This comment has been removed by the author.
war6763 said...

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!

Anonymous said...

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..

Anonymous said...

nice! i've got big plans on trying this with a 15" that had weird backlighting issues and then died.

thanks for the ideas.

Anonymous said...

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

Dr.No. said...

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

Anonymous said...

I guess that it isn't a flat panel monitor anymore. you need to do something about that.

Anonymous said...

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.

kernel_geek said...

I need to do this, would it be ok to cut the fan out ?

Anonymous said...

I had a HP 19 tft power supply go and it cost me $50 from local repaier. Not to dear for a $400 monitor.

Joe said...

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

Anonymous said...

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

XTL said...

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 :)

Anonymous said...

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.

Anonymous said...

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!

ajpenn said...

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.

ajpenn said...

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.

thomas said...

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.

Anonymous said...

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

T said...
This comment has been removed by the author.
Anonymous said...

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

Andrew said...
This comment has been removed by the author.
Andrew said...

I though my monitor fix was ghetto...
:D

This goes above and beyond mine...


http://preview.tinyurl.com/52y2a4

Anonymous said...

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

Anonymous said...

gay y not lern to fix the bord what a shame

computerguru365 said...

learn - not lern, use the built-in spell check - what a shame

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Martina said...

Fix that LCD is very great this monitor.

Martina said...

What a great this panel monitor is very nice screen colour.

lcd monitor repair said...

Wow very recommended step by step process I like your post, I'll stumble for you ...

Nicole said...
This comment has been removed by the author.
Nicole said...

Very smart lcd repair steps. You are great. Thanks!

Nicole Xcite Gamer

Anonymous said...

I really enjoyed the way you put this together- Will this work on an ipod mini?

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Kristjan said...

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.

Anonymous said...

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

web designer, web design India said...

nice post

wackypack said...

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!

Website Design said...

Replace the power supply with such an ugly open box?

Anonymous said...

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? ;)

Anonymous said...

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?

Anonymous said...

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

refurbished computers said...

I have a hack for a single voltage dc power supply but am curious about this one, a little more info will be nice.

Anonymous said...

hi its simon from malta.i have 17'' lcd for pc.and its not switching on.what u think is the problem pls?

behzad said...

best thing to do is to find the bad part inside the smps and change
it .that is all
beh

balu said...

THANKS YAR U R DOING VERY BEST JOB THANKS

Bob Davis said...

Thanks, have you tried an external hard drive power supply? Might not have enough power?

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Ricky C said...

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!

Anonymous said...

Me!

Martin said...

What about the monitors with power supply that has the circuits for the backlight? Does this solution work?

Send Flowers to Italy said...

I suggest this site to my friends so it could be useful & informative for them also. Great effort.

allcustom said...

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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Computer Support Service said...

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.

iminthebathroom said...

You are awesome, I will be doing this weekend as I scored one at a garage sale that has the exact same problem.

iPhone Application Development said...

Great. I am sure, I will tweet this to my twitter account. This will help a lot of users.

Used Laptops said...

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

mohdisa said...

If the inverter circuit is in power board, how to fix with the external power like this.

Anonymous said...

With this setup, can you still use the monitor power button, and adjust contrast, etc?

Anonymous said...

Thanks for the photos. I'll use one to let folks know how a redneck fixes problems.

Duane Morris said...

Great job there!!! Thanks for the images that you've included, this makes your article more graspable and easy to follow too.!

Dulal said...

THANKS.
BEST IDEA AND JOB.
BUT WHAT ABOUT 1.5 VOLT SUPPL ?
PLEASE DEFINE THAT.

DULAL

Anonymous said...

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...

vendita computer said...

great job

Silvio said...

I have a problem, looks like inverter on my lcd is integrated with psu, is there any way to solve that?

Büyü said...

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.

criticpapa said...
This comment has been removed by a blog administrator.
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Shobi said...

Great post, I admire the writing style :) A little off topic here but what theme are you using? Looks pretty cool.

Annna said...

Wow. Beautifully described the whole fixing process. Just love your work and your efforts are really appreciable.

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Harry said...

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

.NET Application Development said...

LCD is becomes more popular nowadays.

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LCD to LED Conversion said...

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

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Anonymous said...

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

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Anonymous said...

I have a LCD monitor that appears black spot in the screen.

Twatwak said...

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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electronics repair made easy said...

Good Stuff, keep the wheel spinning

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Anonymous said...

Very Good! I found your your posting, but destroyed my monitor trying to take it apart. I will know better next time.

LCD Repair Guide said...

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.

Anonymous said...

Hey, MacGuyver called, he wants his monitor back. lol Good job, man. Little bulky, but, who cares for $0?

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Anonymous said...

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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