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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-12-2013, 10:13 AM
Re: ViewSonic VP201b

Reporting back

The replacement caps may have been unbranded...

[ATTACH]65553[/ATTACH]

...and the soldering job may have lacked finesse....

[ATTACH]65554[/ATTACH]

...but it worked!

[ATTACH]65555[/ATTACH]

Thanks everyone Re: ViewSonic VP201b

Reporting back

The replacement caps may have been unbranded...

[ATTACH]65553[/ATTACH]

...and the soldering job may have lacked finesse.......

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-10-2013, 02:53 PM
Re: ViewSonic VP201b

Oops...spotted this just after sending the order. The place I've ordered from doesn't give dimensions, make or any picture. The only info is the temperature rating (105C). I'll have to wait and see what turns up. If they're no good I'll look elsewhere...not that we have much choice in UK....

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-07-2013, 03:40 PM
Re: ViewSonic VP201b

Just need my caps now...

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-07-2013, 01:00 PM
Re: ViewSonic VP201b

Thanks for the confirmation Lexwalker.

My next question is...how do I remove that board to change those two capacitors? I can see six disconnections that must be made, shown by the two yellow arrows:

[ATTACH]65312[/ATTACH]

The white plug is no problem. The five connections to the mains input socket are hopefully spade connectors and will come out with persuasion. But I can see a problem with the inflexible metal lugs (green arrows) holding the board down, and much worse, the curious tag thing marked by the red arrow....

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-07-2013, 10:40 AM
Re: ViewSonic VP201b

*** images not working on previous post....retrying......***

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

06-07-2013, 10:32 AM
Re: ViewSonic VP201b

*** Second attempt ***

Four years since I visited this thread. I'm glad it's still here because I still have the VP201b but it has developed a problem. It flickers for 10 minutes before the lighting becomes even and even then it is prone to start flickering again at intervals.

I've taken some pictures of the innards and based on what I have read in this thread I have a notion what the problem is, but would like confirmation.

First, the inverter board:

[ATTACH]65302[/ATTACH]

The pic doesn't...

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Last edited by Thornapple; 06-07-2013, 10:44 AM. Reason: pics failed
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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

05-15-2009, 01:52 PM
Re: ViewSonic VP201b

Thought I'd come back to post my VP201b success story.

I got some solderable fuses and replacement caps. I chickened out of replacing the caps as the new ones were quite a bit bigger than the existing caps. I soldered the one fuse that was definitely faulty. It's the thing weirdly suspended on red wires. I never said it was pretty...

[url]https://www.badcaps.net/forum/attachment.php?attachmentid=10099&stc=1[/url]

...but it works!

[url]https://www.badcaps.net/forum/attachment.php?attachmentid=10100&stc=1[/url]...

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

05-07-2009, 04:40 PM
Re: ViewSonic VP201b

Thanks Plainbill, I will certainly change the capacitors. Unfortunately I don't think Chip Quik is available over here so I'll have to do without it.

TC

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Thornapple replied to ViewSonic VP201b

in Troubleshooting Computer Displays

05-07-2009, 01:51 PM
Re: ViewSonic VP201b

I was almost ready to give up on my VP201b, but then I found Badcaps and this thread!

The display on my VP201b blanked suddenly leaving just the green LED lit. Following this thread, I have found that one of the tiny fuses on the inverter has blown. Other diagnostics:
i) the power supply board is outputting 18V so I think the PSU is OK.
ii) I have tested the two electrolytics on the inverter ('Rubycon', 220uF 35V). One is OK, the other is over 10 times the expected value (2.6mF). That's tested in-circuit though.

So...

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