Re: Asus vw223 22"
ok, looks like it is going to the service center in that case.
Thanks for your assistance.
TimeWalker
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Last Activity: 09-19-2010, 06:13 AM
Joined: 07-16-2010
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Re: Asus vw223 22"
What I meant is when the monitor is in idle state, actually...
When it's off completely (turning it off physically by button) it still does this hissing noise, however it can be barely heard even if you put your ear to the back of the monitor. As soon as I turn the power on again and the monitor goes to idle or stays on if my PC is running the noise becomes way louder.
I used to have a Fujitsu Siemens monitor that would do the hissing noise when it's completely off, as soon you fire it up it wont hiss. With this Asus monitor it's all the...Leave a comment:
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Asus vw223 22"
Recently I bought a cheapo second-hand LCD ASUS VW223 monitor to replace my 15 inch + 17 inch setup, it appears to be working fine apart from the fact that it makes a slight hissing noise that Im able to hear even sitting 1m away from it. The noise is there no matter if the monitor is on or off. Since the it is still covered by warranty till 14.02.2011 I dont want to take it apart to see if it has any blown/semi-dead components.
Basically, Im just curious, if anyone else has this particular model and is experiencing the same kind of issue ??
If its just this monitor... -
Re: Fujitsu Siemens C383FA
OK got the components yesterday, replaced the big fella, diode bridge and the fuse.
The unit powered on just fine, but when its in idle state the monitor makes a strange hissing noise if you hear very closely i.e put your ear to the base-stand where the PSU is located. When its heated up it wont do this. I have the other replacement caps but those, as mentioned before, are low quality Jamicon ones, some of them are even 85C rated ...
Should I do them anyways ?
[url=http://img.bagem.lv/viewer.php?id=236591497.jpg][/url]...Leave a comment:
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Re: Fujitsu Siemens C383FA
Thanx for the hint, next time im definitely doing this
Uhm, any tips on how do i actually do this ? as ive said before im kind of inexperienced in this matter ...
... at the uni ive been doing just the basic stuff, working with coils, capacitors , resistors/thermistors and doing their measurements ... no transistors or any other components as of yet, so a few tips would be helpful.
Here are some close-up pics of PCB i took after taking out the rectifier and the big cap. These may help to identify components/problems....Leave a comment:
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Re: Fujitsu Siemens C383FA
oh snap, am I screwed ?Leave a comment:
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Re: Fujitsu Siemens C383FA
OK ordered new parts, will update as soon as I get and install them.
- Jamicon (?) 120uF 400V cap
- Jamicon 47uF 35V cap
- Jamicon 1000uF 16V caps x2
- KBP207G diode bridge rated 2A / 1000V
- Micro fuse fast tr5 1.6 (RFS_1.6)
These are being shipped from Sweden so itll take roughly 5 days to arrive here.Leave a comment:
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Re: Fujitsu Siemens C383FA
Thank you very much yet again, it was very informative!
Well, it gives 0.0x both ways if probing "~" and "+" pins, so it fried after-all (oh, how predictable this is ... considering the burn marks it left).
Can you, by any chance, suggest any rectifier with the given 4Amps ?
Will [url=http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=KBL04-E4/51GI-ND]THIS[/url] kind of bridge rectifier work? Oh, and, assuming the fuse is 250V rated the rectifier should be no way more than this, right ?...Leave a comment:
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Re: Fujitsu Siemens C383FA
Ok desoldered the components.
All the electrolytic stuff from the largest capacitor was underneath the actual component, covering the PCB (go rubbing alcohol!
)
The fuse is rated 250V 1.5A not 1.6A as stated on the board, but oh well .. Ive got some 1.6 spares around
The rectifier left a deep burn marks on the PCB. Its a KBP205G and I seem to be unable to find a replacement at my local stores (I happen to reside in Europe, Latvia)... any other options are possible?Leave a comment:
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Re: Fujitsu Siemens C383FA
yeah, it pretty much fried the board around it. but how do i actually verify if it's operational?
Oh, my bad, I even thought to myself for a moment that even 3A is a high rating but 6A ... oO yeah 1.6A ... at least I have those around.
Mine hasn't suffered from these when it was functional. As a matter of fact I have some 1000 uF 25V rated left over from Sammy repair, those on the Siemens PCB are rated 1000 uF 16V. Will 25V still be ok ?...Leave a comment:
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Fujitsu Siemens C383FA
Hey there, totally new to the forums and in fixing electronics in general!
I'm studying telecommunications at the Uni but I had very few hours of practice with electronics and stuff ... so I'm kind of inexperienced.
Now to the actual problem regarding this monitor. One day after electricity jump both my samsung 740B and FS just refused to turn on.
- I was able to successfully repair the Sammy (had to replace 3x caps and a blown fuse), even though I was unable to find a proper fuse to stick it into there.
- On the Siemens unit even the light on the... -
Re: Problems with Samsung 740N monitors
Hey there! New to the forums.
Got this very same problem everyone's having. My PCB is the same as posted [url=https://www.badcaps.net/forum/attachment.php?attachmentid=7481]HERE[/url]
Replaced the 820 uF 25V caps with Panasonics but the monitor still won't power on, not even the image (without back light) whatsoever. Upon powering on and switching off the monitor makes hissing sounds that can be barely heard.
I tested the green fuse located by the blown caps and it seems to be dead. I'm unable to find a proper replacement...Leave a comment:
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