Asus VW246H will not power on

[UKRobster]

Re: Asus VW246H will not power on

Fuse and main cap are ok...

Lets check voltages at the connector from the PSU to the Main board.

DMM set to 20VDC black probe to chassis (screw hole is good) and red probe to each pin and post results.... Also check for any markings near the connector that would indicate the correct value for each pin... Take a photo of it for us too

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.

[swgaspidey]

Re: Asus VW246H will not power on

Asus had a lot of bad solder joints on there ccfls causing shorts and burn out ends check your ccfls that might be the problem.

[newtothis]

Re: Asus VW246H will not power on

Fuse and main cap are ok...

Lets check voltages at the connector from the PSU to the Main board.

DMM set to 20VDC black probe to chassis (screw hole is good) and red probe to each pin and post results.... Also check for any markings near the connector that would indicate the correct value for each pin... Take a photo of it for us too

[UKRobster]

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

[UKRobster]

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?

[Lumberjack777]

Re: Asus VW246H will not power on

Ok, excellent first post. That helps a lot. I'll start with some basic tests since you admit you are a novice (we all were too once). From your symptoms it sounds like it could be that startup cap on the lower right (C606?). That big cap should show some very high voltage. Around 230v * 1.414 = 325 or so. Notice that thick white line to the left of the plugin? That is the "hot" section of the power board. If any of the components in that area are out then you won't get 325v to the main (big brown) cap. Here's the way I would start out...with power board unplugged..
1. Test the white F601 fuse (use lowest ohm setting and look for low ohms)
If the fuse is good.....
Now you have to plug in the power board and be cautious...
2. Check for voltage on the main cap leads. There should be a marking for the + or - on the board. You'll need to set the multimeter to DC, high voltage.

You could also order a startup cap (lower right -- C606?) if it passes both of those tests.
If it passes both of those tests then let us know and we can move on from there.
Just be real careful on the main cap test. I usually put my elbows on the bench to give me steadiness with the probes. Good luck mate!

[newtothis]

Re: Asus VW246H will not power on

Ok do you have a Digital Multimeter at hand?

[UKRobster]

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. Would power on & off using the power button OK. Unless the mains plug was switched off.
If this was switched off the monitor would not come back on unless I disconnected all of the cables overnight. Then the next day it would power on again.
Now it has stopped altogether.

I have taken it apart and cannot see any obvious signs of the caps being faulty. None of them have 'blown' and although parts of the board do look slightly brown, nothing obvious appears to have blown.

I have seen a replacement power board here: http://parts-lcd.com/asus-parts-c-2/...01-p-1025.html which if it comes to it, I am prepared to buy.
However, I would like some further diagnosis this is at fault before spending the cash.

I only have a multi meter available to test components, which I understand is not enough to test the caps properly.

I hope the attached photos are good enough quality to help, if not or others needed please let me know.

Please help! Where do I start??