after about 5 minutes screen goes all horizontal lines. power supply caps look good. No bulges or leaking. 17.75vdc power supply output before and after 5 minutes.
Ideas?
Tks,
<pa
Ideas?
Tks,
<pa
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Re: viewsonic vp201s screen goes bad after 5 minutes
Point a cooling fan to the back of the lcd and see if the lines appear after 5 minutes or not.Originally posted by paulmars View Post--- begin sig file ---
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Re: viewsonic vp201s screen goes bad after 5 minutes
48 minutes and all is fine. Turned off fan and 20 more minutes still ok. Case is HOT. Note that display was laying face down during this test.Comment
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Re: viewsonic vp201s screen goes bad after 5 minutes
I would suspect a bad solder joint. Take a magnifying glass or 10x jewelers loupe and looking ring cracks or suspect joints (especially if this board is lead free solder).
See
http://workmanship.nasa.gov/lib/insp...uirements.html
and
https://www.badcaps.net/forum/showpo...7&postcount=17
for examples of poor soldering.--- begin sig file ---
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We respectfully ask that you make some time and effort to read some of the guides available for basic troubleshooting. After you have read through them, then ask clarification questions or report your findings.
Please do not post inline and offsite as they slow down the loading of pages.
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Re: viewsonic vp201s screen goes bad after 5 minutes
I been studying it for 1 hour now and i got a headache. Pic attached. I took a hi res pic, but max allowed is 1.91 MB, so I reduce it.Attached FilesComment
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Re: viewsonic vp201s screen goes bad after 5 minutes
You can try the opposite and use a hair dryer to warm up a small section of the board at one time.--- begin sig file ---
If you are new to this forum, we can help a lot more if you please post clear focused pictures (max resolution 2000x2000 and 2MB) of your boards using the manage attachments button so they are hosted here. Information and picture clarity compositions should look like this post.
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Re: viewsonic vp201s screen goes bad after 5 minutes
I dont understand.Comment
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Re: viewsonic vp201s screen goes bad after 5 minutes
If it takes 5 minutes for the lines to appear normally and longer with a cooling fan, then if you heat up the board, the lines should appear in less than 5 minutes if you heat up the correct section of the board.
That would help narrow down which component or solder joint is questionable.--- begin sig file ---
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Re: viewsonic vp201s screen goes bad after 5 minutes
ok, got it. Now I need to borrow a hair dryer...This may take awhile. I shall return with the results.Comment
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Re: viewsonic vp201s screen goes bad after 5 minutes
you might want to see if yours has one of those damn ics like mine did and remove it for testing purposes. show us a pic of the other side of the mainboard.Last edited by cadillacman; 05-12-2011, 10:17 PM.Comment
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Re: viewsonic vp201s screen goes bad after 5 minutes
attachedAttached FilesComment
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Re: viewsonic vp201s screen goes bad after 5 minutes
Im still searching for a dryer. Meanwhile, Im using the monitor with the rear cover removed. Its been on for 2 hours and will is well.Comment
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