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
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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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 ---
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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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