Re: Dell E172fpb
Just noted that with my fault I found, that was because I'd replaced one transistor out of each pair instead of the blown pair by mistake(Note to self: Late at night isn't a good time to be doing this :P) So that's probably your cause if you have the same fault.
Neongreen
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Last Activity: 10-04-2009, 03:37 PM
Joined: 10-26-2008
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Re: Dell E172fpb
I replaced the transisters, however now when I turn it on I get the backlight repeatedly flicking on for 0.1 second, a very faint "click" sound, and no LCD display. Any ideas?Leave a comment:
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Re: Recapping failure
I'm going to examine the cap and then start looking at other components. I will let you know what I find.Leave a comment:
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Re: Recapping failure
The leakage is identical on both of those capacitors, and the ripple current is in the ballpark; it's higher for the Suntans.
Just looking it over, there's one point where a pad/ring thing is missing around a solder point. Looks like I must've lifted it and lost it while I was desoldering. Would this affect it? The solder fulls the hole though so I don't know. Plus it has continuity with the rest of the circut. No solder blobs or scratches which could cause a short that I could see.Leave a comment:
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Re: Recapping failure
Thanks a million PCBONEZ,
I verified the polarity on each cap as I desoldered it, and marked it's location. Should I desolder each capacitor and test them?
The capacitors didn't have any other series markings, but I have found the Hermei capacitors in question are of the LZ series. Through elimination, I have found the Suntan caps are - there's a small chance I'm wrong but without any markings to go on, and just sizes, it's the closest I could get.Leave a comment:
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Re: Recapping failure
I've double checked each capacitor, and I've continuity tested the entire circuit, and it seems as though the whole thing has continuity(even from the power board to the status LED). I'm going to keep poking and prodding however.Leave a comment:
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Re: Recapping failure
I'd expect them to atleast function similarly as before I recapped it if the capacitors were not indeed the problem; EG, in this specific monitor it would turn off after an indeterminate period of time.
I have now desoldered the legs and replaced them with capacitors, however this has not solved the problem. Evidently the capacitors themselves are either the wrong way around(unlikely as I checked this several times) or they're the wrong type which is what I'd believe. Are the Hermei 470uF 16V caps that are usually in LCDs low ESR?
...Leave a comment:
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Re: Recapping failure
I'm based in NZ so purchasing low ESR caps is a devils task; however I've recapped a few monitors and the normal lytics seem to work fine. I've never had a problem with them. I replaced Hermei caps, were they also low ESR?
Is there a way for me to test the ESR? I only have a multimeter handy.Last edited by Neongreen; 11-08-2008, 09:44 PM.Leave a comment:
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Recapping failure
Hiya,
I recently recapped a AOC LM721A; the inverter inside had about 5 bulging caps on a multilayer PCB. I took the easy route and snipped the old caps off and soldered the new ones onto the previous caps' stems, as I wasn't keen to have to deal with desoldering them.
Now, instead of briefly lighting up then turning off, the monitor is 100% dead.
I've checked the resistance across each solder joint and they're all perfectly fine, I resoldered the ones that had a slightly higher resistance.
All caps are on the right way, I double checked.... -
Re: Stuck with opening this monitor...
Nevermind, solution has been found.
For future reference:
http://csd.acer.com.tw/acer/URMUL1.NSF/1af87a750eeeb70f0825628f006e0bfc/86c01365b6b82317482572330038e26e/$FILE/X191%20user_enu.pdf
Would've deleted this if I could :PLeave a comment:
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Stuck with opening this monitor...
Hi guys, I'm suspecting this monitor of bad caps but can't open it for the life of me. Camera is missing at the moment so can't post a picture, but essentially there are five screws holding the backing on. I've removed the one out of each corner, but there's a fifth and final screw which is blocked by the stand. The stand feels like it's screwed onto the backing from the inside.
Model is an Acer AL1714. Driving me completely insane, I can't open it without removing the stand and can't remove the stand without opening it.
Any advice?
Thanks!
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