Evening friends,
I work with many computers throughout my day and I haven't seen a clearly failed capacitor in some time now. However I still come across bad mainboards. It led me to wonder if capacitors are still failing but not bulging the way they did in the pentium3 and early pentium4 days.
Any thoughts or facts about this?
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Are caps still failing the way they used to?
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Re: Acer AL1715 briefly works then goes black
waiver of responsibility in this matter.
I sonicsteve hereby declare that I will not hold anyone responsible for any damage to myself or to my property for any advice given.
Trust me I understand that in the end my actions are my own. Surely someone here has done this kind of thing before and knows of a way that is mostly safe and mostly sure to get the job done.
My materials.
I don't have any resistors that I can use without going out and buying some. So if anyone recommends this please...
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Re: Acer AL1715 briefly works then goes black
If you think that one is crooked take a look at the cap on the top left of that same pic. Notice that you see the top of the cap and very little of the sides!
I could show you an emachines board full of caps just like those two.
Anyhow before I derail my own thread,
I could really use
I have far too many questions to go on.
I looked at other threads, it seems that the first pic is the CCFL inverter. I need someone to confirm or deny this. I also need someone to help me...
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Re: Acer AL1715 briefly works then goes black
OK so here's a crazy thought but....
Why not take an old extension cord and bury the female end in the garden. Then touch the male end to the capacitor. Wouldn't this send all the charge into the garden?
Come on experts humor me and tell me if my crazy idea has any merit...
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Re: Acer AL1715 briefly works then goes black
OK so I guess now is when I say HELP!!!
Good news I know how to solder, bad news I'm a total novice in handling high voltage items. Up to now I've stuck with just mainboards. nothing to shock you there.
So...Please no need to pretend, you need to treat me like a newb. I don't want to do some thing like short the 400v cap and either kill the monitor or cook my hair.
To proceed this is what I need to know;
1. Should I just replace all the caps I see on the power supply, and the other board.
2....
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Re: Acer AL1715 briefly works then goes black
Could someone give me an idiots newb guide to testing that 400v cap with a basic voltmeter? I've never had to test anything beyond 10v before, and as such haven't given much worry to grounding, shocking etc.
PS I know it's the amps that kill you but I know volts can give one heck of a good jolt.Last edited by SonicSteve; 07-04-2007, 11:31 AM.
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Re: Acer AL1715 briefly works then goes black
After a bit more research I found pics of a CCFL inverter from a samsung monitor. Am I right that they are a separate unit somewhere deeper inside the unit, maybe under the power supply?
Is it possible that the power supply is delivering faulty power to the inverter and that the inverter is OK?
I'm just wondering if something more might be wrong. Remember that I can't access the monitors configuration menu at all even when it seems to be functioning properly. Also I have the floating OSD that says "input not...
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Re: Acer AL1715 briefly works then goes black
This is an edit to the first post.
8. The green LED stay green while there is video signal coming from the computer, and turns orange when computer video enters sleep. IE the monitor is properly detecting video signals but the display turns off.
9. Even when the LCD is working it has the floating OSD that says
"signal not supported" but at the same time for the brief 5 seconds it is perfectly displaying what it should be. I can see the desktop or whatever.
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Re: Acer AL1715 briefly works then goes black
I do have a few questions,
1. How dangerous is the big ol fat cap that is 400V? How long does it take to discharge by itself, and how do I discharge it manually?
2. This thread seems interesting and similar
[url]https://www.badcaps.net/forum/showthread.php?t=3515[/url]
3. I wonder if this thread may be helpful, I don't much about transistors/resistors and checking their values or anything.
I'm really quite a newb when dealing with this stuff so I'm really looking for...
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Acer AL1715 briefly works then goes black
Good morning friends,
I was given an Acer AL1715 last night that was supposed to not work. However when I plugged it in to my surprise it did! Except that after about 5 seconds the display turned to black.
1. power was still on, green led still lit
2. Back lighting? (I don't think that this is the root of anything)
3. Can't access the menu options at all
4. Changing screen resolution and refresh rate has no effect
5. If I unplug it, wait a few seconds and plug back in it will work for another 5 seconds.
6. #4 is true even if I...
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Re: Boards that work when they are reset.
Those are indeed some unpleasant possibilities. I don't know where to start!
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Re: Boards that work when they are reset.
The strange thing is though that I'm using a good P.S.
I've replaced caps that didn't seem to be bad simply because they were OST. I don't recall the board ever doing this before I recapped it. I used brand new caps. Some Samxon and the rest united chemcon.
I suppose this is why I wonder sometimes if a replaced cap can infact be connected poorly.
Can flux be in the hole? if it is could it be causing a poor connection? I just don't know.
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