ViewSonic VX1940w

**Tjcrazy** · 11-24-2011, 11:54 AM

Re: ViewSonic VX1940w

Originally posted by trebo

tjcrazy
http://uk.rs-online.com/web/generalD...id=welcometors
they have a unit just outside of cardiff on the treforrest industrial estate
you can get there by train if you wanted to
Unit D8.2/Forest Court/Main Av Pontypridd CF37 5UR
01443 841120
phone them or, there is a shop on site I understand or order on line

Due to my university studies, I don't really have time to go there within the next week.

I really need somewhere online where I can buy them.
They've got this: http://uk.rs-online.com/web/c/passives/capacitors/
But I'm not too sure what type of capacitors I need.

**mariushm** · 11-24-2011, 12:14 PM

**Tjcrazy** · 11-24-2011, 12:30 PM

Re: ViewSonic VX1940w

Originally posted by mariushm

Thanks, again!
I've gone for the following as its in multiples of 5, its quite costly. This means I ahvent got the two large capacitors, which were £1 each.

22uF 63V
http://uk.rs-online.com/web/p/products/3150940/
220uF 35V
http://uk.rs-online.com/web/p/products/7258161/
1000uF 16V
http://uk.rs-online.com/web/p/products/5261266/

Someone in an earlier post said it would probably work if I only replaced these.

**mariushm** · 11-24-2011, 12:53 PM

Re: ViewSonic VX1940w

I still say you should replace the 2200uF one also but whatever you think it's best for you. If it's not swollen on your board, it may have some life left in it but you can't be sure.
You may just have to place another order a few months later and be angry about opening the monitor again and waiting for parts.

This should do ... http://uk.rs-online.com/web/p/aluminium/7083572/

Give them a call, see if they can make an exception for you.

**Tjcrazy** · 11-24-2011, 12:57 PM

Re: ViewSonic VX1940w

I added this one too it. http://uk.rs-online.com/web/p/products/7083661/

If those 4 are all good to you, I'll give rs-online my £15 and hope for the best!

**Tjcrazy** · 11-28-2011, 09:20 AM

Re: ViewSonic VX1940w

The £16 worth of capacitors finally came, and I did a bit of soldering, puting the new ones in place.

SO I put the screen back together, plug in the kettle lead and boom! Blue spark and nothing..

Now I got no blue light or anything. Have I just blown it? What should I do now? Buy a new power board? Buy a new monitor?

Tim

**trebo** · 11-28-2011, 10:03 AM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

The £16 worth of capacitors finally came, and I did a bit of soldering, puting the new ones in place.

SO I put the screen back together, plug in the kettle lead and boom! Blue spark and nothing..

Now I got no blue light or anything. Have I just blown it? What should I do now? Buy a new power board? Buy a new monitor?

Tim

first check you havent put a cap in the wrong way round, it happens sometimes

**Tjcrazy** · 11-28-2011, 11:56 AM

Re: ViewSonic VX1940w

Originally posted by trebo

first check you havent put a cap in the wrong way round, it happens sometimes

If I have, does this mean the whole things broken?

Could I easily take it out and put it back the right? I'll check soon.

**trebo** · 11-28-2011, 12:31 PM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

If I have, does this mean the whole things broken?

Could I easily take it out and put it back the right? I'll check soon.

no the whole thing is not broken
no you wont be able to turn the cap around, it will need a new one
open it back up and tell us what you see
there may be some burn mark that you see
or damaged parts, no big deal, help is available
take a look at front and back of psb, and post back info

**mariushm** · 11-28-2011, 12:34 PM

Re: ViewSonic VX1940w

also make sure you cut the excess leads from the capacitors and there's nothing left on the board after you trim the leads.
If you installed one incorrectly, that one's damaged, you need to replace it.

If you don't get the power led working now, the fuse may be burnt, in which case you'll need to replace it.

**Tjcrazy** · 11-28-2011, 03:59 PM

Re: ViewSonic VX1940w

Ok, just checking. The 'strip' on the side of the capacitor indicidates negative (-), yeah? Its been the smaller wire on all the capacitors. Hoping this is right!

**trebo** · 11-28-2011, 04:35 PM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

Ok, just checking. The 'strip' on the side of the capacitor indicidates negative (-), yeah? Its been the smaller wire on all the capacitors. Hoping this is right!

Correct

**Tjcrazy** · 01-21-2012, 06:05 PM

Re: ViewSonic VX1940w

Thought I would update you guys on my situation..

I tried replacing the capacitors on my board, did so - turned it on and BOOM, fused everything. no blue ligbht on the screen - nothing. I think it's dead.

However, I went home over Christmas and tried replacing the capacitors on his power board, which had the same problem... And here I am, typing this message onto that very screen!

Thank you so much guys, you have saved me £80. Cannot say how thankful I am.

**retiredcaps** · 01-21-2012, 06:38 PM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

turned it on and BOOM, fused everything. no blue ligbht on the screen - nothing. I think it's dead.

Boom as in something popped/exploded? If yes, check to make sure you put in the caps the right way.

**Tjcrazy** · 01-21-2012, 06:43 PM

Re: ViewSonic VX1940w

Originally posted by retiredcaps

Boom as in something popped/exploded? If yes, check to make sure you put in the caps the right way.

Well I powered it on with the ends of the caps (the metal wire bits you should cut off) touching the metal backplate of the screen, as I didn't put the plastic bit in. So I powered it on and saw a big blue spark and nothing, so I probably fried it all..

**retiredcaps** · 01-21-2012, 07:00 PM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

so I probably fried it all..

Not necessarily.

If you have a mulitmeter, you can test the following:

1) fuse. A good fuse should measure less than 1.0 ohms.

2) bridge rectifier - see if it is shorted.

3) power mosfet - see if it is shorted.

**Tjcrazy** · 01-21-2012, 07:13 PM

Re: ViewSonic VX1940w

Ha, well I'm not too bothered. Cause I don't need two screens. I can't really afford any tools to try and see if its working. I might try replace the caps I replaced before and give it another go?

**retiredcaps** · 01-21-2012, 09:25 PM

Re: ViewSonic VX1940w

Originally posted by Tjcrazy

I might try replace the caps I replaced before and give it another go?

You can if you want too, but I think you might have shorted out one of the above or blown the fuse.

ViewSonic VX1940w

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