It's name is unknown location L108,what is it??

[CudaDave70]

Hello to everyone ,got a small problem here . I seem to not be able to Identify this little SMD that self destructed on this inverter circuit. I spent alot of time surfing the net for the meaning of letter L in electronics and what it's purpose was when it was still alive.
It is now smokeless because it all leaked out. I resembles an SMD Capacitor but there is no numbers on it, it has a twin brother on the other side of the board. What does the letter L mean other than a land . Is it a component or just a jumper? I am curiosly waiting for someone to help me, It is driving me nutzer. It is above the black line and highlighted nothing in the way of markings on it or even the other on just like it.
Dave

[arneson]

Re: It's name is unknown location L108,what is it??

A surface mount inductor like this.
http://www.koaspeer.com/inductors.asp?part=4
If you have junk boards it's not hard to scarf one from something else.
Old cell phones etc.

[i4004]

Re: It's name is unknown location L108,what is it??

L is a coil.

coils burn when too much current passes thru it, so prior to replacing it you should establish what caused it....

and.. that's a nice car on your avatar...VERY nice!

edit/ ah arneson was faster...

[CudaDave70]

Re: It's name is unknown location L108,what is it??

Thanks ,I watched this thing turn to charcoal just as I put the power to it. It is for a HP monitor that the one backlight was staying on even when the power switch is off. The one side of backlights that stayed on got reeealy bright right before it's demise.
The one mosfet is shorted out causing the light to stay on ,I was in the process of troubleshooting it and the smoke came out.Did not know what the L meant,I thought it was a SMD capacitor at first

[CudaDave70]

Re: It's name is unknown location L108,what is it??

You better believe I will scarf one up I got alot of old junk laying around ,Jim. It apparently has no values to it I guess because it is not identifiable in any way other than color or size.
Does this mean any one I "scarf " will work ? I also think something went crazy right before it happened I recapped the board and put 4 new C5707's transistors on it.It worked beautiful ,but the top ccfl's wouldn't shut off. I found the bad AO4411 mosfet Scarfed one out of an old monitor It worked till this mishap. I couldn't find these mosfets unless I would buy almost 2000 at 1.38 each. Nope.
And the Cuda in the avastar I have owned for 30 years,it is now on a rotisserie for restoration.

[CudaDave70]

Re: It's name is unknown location L108,what is it??

I could use some input on how to tell what inductor I need. Is there a way to identify them.Then I would know what to purchase ,scarf ,steal or even borrow from another source.Come on Jim, you know ,don't you?

[arneson]

Re: It's name is unknown location L108,what is it??

Color and size are your only clues. If you searched long enough you would eventually find the schematic..
I didn't respond becuase I was thinking you were sick of that unit by now.
I'm guessing to say it handles a few hundred milliamps at 1.5uH.
If it burned and measures open you'll be looking for the cause.
There's always that point where you put value on the subject,
and then compare to your time and aggravation level.
When I'm in your position I start looking for one with a smashed screen
for nine to twenty nine bucks.

[CudaDave70]

Re: It's name is unknown location L108,what is it??

I am not much of a quitter,the one you are talking about (Dell E172FPb ) is in a box now(morgue) and is a parts donor. I have given up on it, but now this is an entirely different monitor Iam trying to fix. I have about 10 I am working on all scattered around the basement and garage .
I have successfully fixed about 5 already.
I won't ask something just for the sake of conversation. If I ask I really need help when I post something.
I am working my way around the internet and this is where I come when I want some real no BS answers from what I see as some real experts ,which I am not.
I needed this as something to give me a distraction to the fact that my physical abilities are no longer there for me to do what I want to do and that is work on cars and diesel engines.
I have always been interested in electronics but have next to nothing in experience when put next to the pros on here . Many of my questions are something that appear sort of stupid to people on this forum, I'm sure .But I am sincere about this and I appreciate everything that people have helped me with. I just hope I can do some good for somebody soon that is where the real satisfaction would be for me.
Also I have alot of these 20 dollar monitors laying around ,but not many of the same make ,size or design. I like the challange but I am losing my a$$ so far when it comes to money invested as to what I get back .When you get these ones that need a $30.00 AC adapter you already are in the hole and I have about 5 of those, I won a few and lost alot more. Money really wasn't the priority here ,YET but it is getting close now. Thanks Jim and everybody else on here too. I forgot to tell you ,it is a relly nice shape (physically) HP 19" FLAT SCREEN LCD, I really want to save this one from the boneyard.
Dave

[i4004]

Re: It's name is unknown location L108,what is it??

could it be that backlight is faulty and consuming too much power?

can you hook some other backlight to test it?

other than that you said it has 2 baclights and one is ok: that means you have a working circuit you can compare against a faulty one.
although i dunno is it possible to unhook the flawed one while measuring the good one, and then just hook it uop when you wanna test it, briefly.

[arneson]

Re: It's name is unknown location L108,what is it??

Here's a tip for the needed power bricks.
Those really cheapo universals work as long as you keep the load below 4amps.
Even if you toast one it's no big deal, they come right from china.
http://search.ebay.com/Universal-AC-...3aMEWNQ3aMEVSI
Like these.
Throw up a listing of your clunkers I may have or need some parts.

[CudaDave70]

Re: It's name is unknown location L108,what is it??

Hey,I was driving down the road today, someone must have cleaned out the garage and whammo ,There it was, a pretty nice looking 19 inch flat panel monitor laying face up and it started to rain right about then.
I scarfed that baby up and saved it from the garbage man. You just know he would enjoy throwing it as hard as he could into the back of his truck to watch it smash to little bitty pieces.It needs either ccfl lamps or the inverter s-it the bed on one side. I'm gonna check er out right now.
I will take an inventory of stuff after I can determine what is junk and what can be salvaged. I need to get some of these fixed ,I got to get some caps, mosfets, inverters, transistors and of course, some inductors. I found a really good cross ref. for mosfets and I located what I need to fix a few other projects.
I already bought THREE 12 volt 4 AMP power bricks for around 60 bucks with shipping (not to bad) they look like nice ones but they are a little smaller than the OEM ones and have the grounded plug.
The monitor that fried the inductor the other day (I have yet to get a replacement one) ,I had it connected up to the spare set of lamps because I wanted to test it before I completely assembled it. They are a known good set of ccfls . The one set got real bright then the smoke came out of the inductor and out go the lights. OK got to go.
Dave

[CudaDave70]

Re: It's name is unknown location L108,what is it??

I have a freinds 15 inch Magnavox 15 MF050V/17 LCD TV-Monitor here, I am trying to figure why it just shuts off after it has been on for about 20 mins. I opened it up suspected an overheated component that would look like it had been hot and....nothing . It is all nice and new looking in there. I removed some of the aluminum tape blocking air hols thinking if I give it air it would stay cooler and therefore stay on(it would get smashed if it was mine if I was trying to watch football game). I found many posts on Google about this problem and it seems very widespread. I figured it was a heat issue because if you put a fan behind it ,it does not shut off then .What do you all think I should look fornext ,there is a little fuse that has 3 zeros on it ,it can't be power supply it is a brand new one and I tried another one ,plus the little red led is still on when it shuts off. Is it a heat activated safety somewhere,a faulty transistor, bad caps that look good I really think this problem is built into the set because I noticed there is another one they made that has a "B" at the end of the same model number now,HMMM not a good sign for the one without a B after it's model number.Gotta be a difference.

[CudaDave70]

Re: It's name is unknown location L108,what is it??

Got this on too! It's good now.