Re: Acer S220HQLbd 3522-0252-0150
After closer inspection and testing I've found the problem is an IC which has had a leg blown out, part number MP3389EF which i've now managed to buy from ebay (china). As i've never soldered a component this delicate/small before...any tips on doing this? I have a bad feeling i'm going to mess this up. My soldering skills aren't bad but the bottom of this board looks so delicate and despite the fine tip I have on my soldering iron it still doesn't seem fine enough. I'm guessing this was machine soldered originally >_<
Demix
Senior Member
Last Activity: 04-12-2013, 08:13 AM
Joined: 07-20-2009
Location: Watford, England
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Acer S220HQLbd 3522-0252-0150
Hi guys
Basically I think my friend has managed to fry his screen as he was using the wrong power cable to power it (one from a Virgin Media tv box). The mainboard smells a little of burning but I can see no signs of damage. The blue light comes on as per usual and things work as they should but without the backlights. This isn't your usual 2 seconds to black issue, they just don't come on at all but there is still power to the screen itself. I can't seem to find a spec sheet for the main board. I haven't attached a picture of the actual main board as there are no physical signs... -
Re: Packard Bell Viseo 191WS 2 seconds to black
The caps I used were Panasonic FC series, low ESR. I purchased them from RS Components. As for the CCFL's. I've already pulled them out completely and tugged on the wires. I even removed the rubber caps as best I could, to find that solder connection was in fact solid. Plus all 4 CCFL's light up perfectly one by one using an old laptop inverter I had laying around. I didnt play for too long but they seemed to be running fine using that inverter without going out or making any sounds at all. Thanks
When my new fuse gets...Leave a comment:
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Re: Dell E152fpb power LED blinking on and off
Hey there smd. First things first open up the monitor and check the capacitors on the inverter/power board. Look for any bulging/leaking caps. That would probably be the first step. Also once you have the monitor open, get some pictures of it on here. One of the top and bottom of the Inverter/power boards. That way others may be able to spot problems that we would miss if we can't see what you're seeing. Also an extremely helpful guide to the two seconds to black problem can be found here - thanks to retiredcaps
[url]https://www.badcaps.net/forum/showthread.php?p=133261[/url]...Last edited by Demix; 07-26-2011, 07:01 AM.Leave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
I really wish I could edit posts rather than having to make a new most. I feel like i'm spamming a lot. Anyway, I tested the transformers properly and after doing more research and reading (I read the comprehensive guide written by retiredcaps, which was extremely helpful). The transformers are as follows -
Using Multimeter set to 2k ohms
T2: | T1:
1 to 2 - .001 | 1 to 2 - .001
1 to 3 - .001 | 1 to 3 - .001
1 to 4 - 1 | 1 to 4 - 1 - earthed?...Last edited by Demix; 07-26-2011, 06:51 AM.Leave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
I will be honest, that area is actually a result of shoddy solder work which I attempted to fix. I think I may have scorched the board a tiny bit with the soldering iron, but it was not the part which touched the metal casing. Im pretty sure that (i guess i can call it lucky) the part of the board that touched was around the fuse area that actually blew. I put the pcb back against the metal (obviously no power this time haha) and its the only part of the board that touches, as the rest has the little rubber pads intact and it keeps...Last edited by Demix; 07-25-2011, 06:33 PM.Leave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
I can confirm the thing I thought was a fuse, in fact was, and it was gone. At first I couldnt find any information on the fuse as it said "RSFR-H" on the side.. then I realised this was a type of shrink wrap ¬_¬ so I removed that to find the fuse underneath. On the fuse is "3N T2A 250V" So i will try and find a suitable replacement. Thanks again for the help, and hopefully I will figure this out soon hehe :P
would this be a suitable replacement? -
[url]http://uk.rs-online.com/web/p/fuses-cartridge/7032629/[/url]...Last edited by Demix; 07-25-2011, 05:10 PM.Leave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
Thanks a lot. I would check that now, but it seems I killed it completely. Me being the idiot that I am, went to test it and forgot I had it laying against the metal casing of the screen panel... lets just say my ears are still ringing. Im pretty sure ive blown a fuse somewhere as now i get no power at all hah. If I cant figure out what I blew then I guess I will give up on this project for the moment >_< Thanks for the help anyway
edit: its not the plugs fuse by the way, I checked that and it was fine.. I defo shorted...Last edited by Demix; 07-25-2011, 12:45 PM.Leave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
Okay so I got a little sidetracked on this, but since then ive confirmed the CCFL's are all working correctly (using a different inverter) I've re-soldered the questionable areas but now im out of ideas. I may just invest in two new transformers If i can find similar ones on ebay or a specialist siteLeave a comment:
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Re: Packard Bell Viseo 191WS 2 seconds to black
My apologies. It was rather late when I posted and I somehow had it in my head that I had already listed the symptoms xD
Power LED comes on, The screen runs fine for a varying amount of time. Sometimes it will be 2 seconds, other times it lasts a whole... 8 seconds lol. I have yet to check the output voltage from the power supply but I will get on to that as soon as i get home this evening. As for the CCFL leads, I will check them out later and possibly tear apart another similar screen to test with. The inverter trasformer...Leave a comment:
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Packard Bell Viseo 191WS 2 seconds to black
Basically, my girlfriends sister's monitor decided to die on her a while back. At the time I wasn't feeling up to the task of looking at it properly so I asked her what had happened. She said it just cut out and she smelt smoke. No problem I thought to myself. If there is smoke then I can find the source of the damage... However, When I opened the monitor up I found no damage at all, apart from the shockingly crap caps that the manufacturers had used. I replaced all of the caps on the inverter, apart from one (a large 82uf 400v samxon one which looked fine) and I put the monitor back together,...Last edited by Demix; 07-22-2011, 06:02 PM. -
Re: Not 100% sure where I should have posted this :P
Sorry for the double post, but I have one final question.
It works perfectly now, but if I wanted to increase the brightness of the LED's would I need to use a higher voltage Zener Diode? or is just that I have picked rather weak LED's hehe.. I decided to order a pair I found which look identical to the originals anyway, so i can change them over when they get here
I also just want to take the time to thank you both for your help =] thanks guys, you've been helpfulLeave a comment:
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Re: Not 100% sure where I should have posted this :P
The battery isn't bad, I made sure of that Plus the fact it still has enough power to light up two LED's is a good sign, I guess lol. I have come to the conclusion that it is the Zener Diode which is causing this issue, simply because when I unsoldered it... it split in half haha >_< There is nothing written on it though.. but I have taken the exact measurements and gone to my trusty parts site - rs supplies.. Ive managed to narrow down the hunt, but is there any possible way I could figure out things like Nominal Zener...
Last edited by Demix; 07-14-2011, 06:50 AM.Leave a comment:
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Re: Not 100% sure where I should have posted this :P
Yeah, fair enough. But do you think that would solve the issue of the time not being stored? - prior to the LED's going, and even after, I think, the time always stored unless I pulled the battery for any length of time.
Oh and thanks for the info! Magnifying glass and light it is hehe...
Leave a comment:
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Re: Not 100% sure where I should have posted this :P
The Small PCB that the LED's are connected to has it's own battery - its used for storing the time etc, as it runs seperate to the system time >_< My actual computer hasnt been affected by this =] thanks though. When I resoldered the zener, thinking about it.. i may have splashed/spilled a little too much solder on it, so im going to check that out for the moment. Also, how would I go about finding out the specifications of the zener? So I can look into buying a new one just in case its this thats failed. ThanksLeave a comment:
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Re: Not 100% sure where I should have posted this :P
Awesome, will do ^^ Also I just noticed that it only puts them on dimly when I unplug the whole thing from the main power source So once it's connected to the pc, the lights stay off completely when it's not being fed power. Thanks for the input and help though =]
Edit: I found the drawback to this.. It's not saving the time, haha. I knew it couldn't be that easy ¬_¬ back to the drawing board it seems. First things first, I'm gonna put the old Diode back and hope for the best lol.
Edit 2: That seems...Last edited by Demix; 07-13-2011, 06:19 PM.Leave a comment:
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Re: Not 100% sure where I should have posted this :P
I'm afraid it is the battery >_< I did unplug it from the computer, and then waited.. and after a short while i took the battery out and boom, the lights went out. I put the battery back and the LED's come back on lolLeave a comment:
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Re: Not 100% sure where I should have posted this :P
Woop! Thank you so much for all your help, jsod =] I stuck some new LED's in from maplins (just two random ones) and the results can be seen here ^^ I think they were in series and one of them went D: all of this just for a shoddy LED! Thanks again ^^
hmm I just realised I seem to have a final problem. The battery which is supposed to be only in use to save the time, seems to be powering the LED's a little when the power to the pc goes off =[ im thinking this may be because i replaced D2 with an equiv which had...Leave a comment:
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Re: Not 100% sure where I should have posted this :P
Right well I tried what you said and tested from the ground to the orange end of the Zener and for a split second it gives me something like - 1.977 then it just goes to -1. This happened for both ends of the Zener. Also i tried it the other way around and got no result back at all. This is really baffling me haha >_<
Edit: I'm an idiot lol, voltage from ground to orange end = 2.35, however voltage from ground to the other end of the Zener is also 2.35Last edited by Demix; 07-13-2011, 07:09 AM.Leave a comment:
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Re: Not 100% sure where I should have posted this :P
It's either down to the LED's or the Zener Diode now then I guess. I really cant see it being anything else. Also those LED's come out easily. they aren't molded, they simply sit in small holes already made for them. I lifted them out (bending them straight) to get a better look at them. My brother did manage to short his PC several times as i said, so it may be the case. I also read that this can happen when a short occurs. The zener diode will go, messing the entire thing up.
Also, i may try disconnecting the LED's...Last edited by Demix; 07-12-2011, 10:42 AM.Leave a comment:
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