Re: Asus VW246H will not power on
I have inspected the underside of the board, and have found the attached images.
I have only the research I did on Google to try to identify a 'cold solder joint'.
The first picture shows the component attached, which looks like two items attached either end of a heatsink.
Are these the diodes Davi.p mentions?
Then I have tried to get the best pictures I can of the underside.
I know they are not the clearest images, but do they look like cold solder joints?...
UKRobster
Member
Last Activity: 01-23-2014, 04:43 PM
Joined: 11-26-2013
Location: Cornwall
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Re: Asus VW246H will not power on
I have had a look at some cold solder joints. Will inspect the board with a magnifying glass.
The 470uF caps may be too wide. Will check that too.
Thanks for the other advise I think I will try to narrow down which section of the board the issue appears to be in!Leave a comment:
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Re: Asus VW246H will not power on
The other caps on the board are : 470uF 35v & 220uF 25v
I have found these, could anyone confirm they are correct?
[URL="http://cpc.farnell.com/rubycon/35yxf470my1021/capacitor-radial-low-impedance/dp/CA05109?in_merch=Products%20From%20This%20Range"]470uF[/URL]
[URL="http://cpc.farnell.com/rubycon/25yxf220my0811/capacitor-radial-low-impedance/dp/CA05102?in_merch=Products%20From%20This%20Range"]220uF[/URL]
They are the same make and series as the one I ordered for the start up c...Leave a comment:
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Re: Asus VW246H will not power on
I used a hairdryer to warm up the other caps. This made the whole board warm, however it did power on.
I will try replacing the other caps and see if that resolves.
selldoor when you mention a cold joint. Could that be on on of the caps? Or do you mean it could be another component? Is a cold joint on the caps common?
What I'm getting at is that I hope replacing the caps will solve this issue.Leave a comment:
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Re: Asus VW246H will not power on
I tried the hairdrier test, but as Davi.p thought, it didn't work.
I thought I would just go ahead and replace the start up cap again.
This hasn't worked either.
It will still not power on
Is there anything else is to try now? Davi.p have you any procedures to offer?Leave a comment:
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Re: Asus VW246H will not power on
Sorry if my post is a little confusing.
Since early December and initially solving issues, monitor has always been plugged in with power cable, and wall outlet switch has always been 'on'.
Monitor itself is sometimes left on standby (ie: turn off PC but do not touch monitor power button - usually by my girlfriend). But more often monitor is turned off with its power button.
Previous to changing 'startup cap' in December, if I turned off wall outlet power. When turning it back on, monitor...Leave a comment:
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Re: Asus VW246H will not power on
Selldoor: Thanks for replying.
It doesnt always get left on standby, but power cable is in extension lead which is always on, perhaps that provides enough to keep cap operational or solder joint warm.
Will try the hairdryer trick, but it will be tomorrow. Will post back with results, thanks again!Leave a comment:
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Re: Asus VW246H will not power on
Hi guys, havent logged in for a while an can see this thread has been busy!
Glad my issues have helped out others.
Im gutted to report that my issues have returned.
Since I fixed my monitor at the begining of December it has been functioing fine.
This weekend I needed to turn off my fuseboard to change an electrical socket.
So I powered off the monitor and unplugged the power cable (although it is plugged into a 6 way extension and this was still switched on at the wall).
When i turned the fuseboard on...Leave a comment:
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Re: Asus VW246H will not power on
Hi guys,
Sorry for not posting back sooner, but I am in the middle of decorating and that took all of my time over the weekend!
Anyway I have some good news.
I replaced the start-up cap last night and tested the monitor.
It powered on! Great!
Then (not so great) I started putting it all back together, just finished clipping the case together again, and thought I would just test it again before assembling the stand.
It would not power on! It was late, and I although I was tempted to tinker...Leave a comment:
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Re: Asus VW246H will not power on
Oh OK, I didn't realize the boards needed connecting while testing - D'oh!
I will see if I can get it hooked up and read them again, properly!
Thanks for the tip about the sewing needle!
If I did use a hairdryer on the start-up cap and it powered on. What would that prove?
Does that indicate the cap [I]is[/I] at fault?Re: Asus VW246H will not power on
Oh OK, I didn't realize the boards needed connecting while testing - D'oh!
I will see if I can get it hooked up and read them again,Leave a comment:
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Re: Asus VW246H will not power on
I checked the fuse at F851 and it eventually settled at 0.6 - as before.
Then checked each connection in the connector CN701, with the mains plugged in.
Nothing - well not actually true I got -0.03 on most of them. Certainly no volts through!
So I didn't bother to take a picture at this point as it seems the power is not getting that far.
selldoor: thanks for the link for the start-up cap. I had been looking this afternoon and had seen a couple of another site [URL="http://uk.rs-online.com/web/"]http://uk.rs-online.com/web/[/URL]...Leave a comment:
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Re: Asus VW246H will not power on
Thanks for your patience, it is appreciated.
I will check those things and let you know.
Thanks guys!...Leave a comment:
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Re: Asus VW246H will not power on
Sorry to be so green and ask what could be a simple answer. But where do you mean for me to check?
Could you outline it from one of my photos?
swgaspidey: How would I check my CCFLS - again sorry to ask, but I am very new to the inner workings of monitors....Leave a comment:
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Re: Asus VW246H will not power on
Right I have tested both of those.
The fuse read 0.6 once it settle down. The readings were all over the place initially.
The main cap read 333v.
So I presume both of these are OK.
The cap at C606 reads '50v 47uF' down the side. I guess that is the capacity I need to search for.
Does anyone know of any where in the UK to buy quality caps?
I don't want to try anything of poor quality, if I can help it.
Look forward to your replies
Leave a comment:
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Re: Asus VW246H will not power on
Thanks for the replies. I am at work now, so will try those 2 tests tonight, and post back with the results.
For testing the fuse, what results should I expect? I am right in thinking that if the ohms level doesn't change the fuse is blown?Leave a comment:
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Asus VW246H will not power on
Hi,
I have been reading quite a few posts in the past couple of days and I am amazed at the level of help offered on this forum.
So many people, giving so much time to help others is outstanding.
Some of the content is waaay above my head, as I am a complete novice when it comes to electrical components, so please be gentle.
Anyway if you could help me to diagnose the issue with my monitor - Asus VW246H it would be greatly appreciated!
The monitor will no longer power on, no power LED - nothing.
It has been playing up for a couple of months.... -
Re: New Members - please post your introductions here
New member, just wanted to say hi.
Have been reading through quite a few threads in the past couple of days and I am amazed at how many experts dedicate their time to help others.
It looks like a fantastic forum and full of helpful information.Leave a comment:
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