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Weird output from Acer 19" monitor, OSD works fine

 
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tftproblem1



Joined: 28 May 2011
Posts: 2

PostPosted: Sat May 28, 2011 3:22 pm    Post subject: Weird output from Acer 19" monitor, OSD works fine Reply with quote

I don't really know how to describe what happened to my monitor, but I made a small video here: http://www.youtube.com/watch?v=Gjh5crE-Zx4

In summary, the output of the monitor is all garbled, but still there (not dead) - but the OSD works fine.

I have some knowledge of electronics - so I opened it up, checked the capacitors, didn't find anyone gone bad - but I'll check again, might have missed something (not very experienced in this).

Any pointers as to how could this happen, and where should I focus my investigation? I guess it's something related to the VGA input, but what could it be? (So I should check only the vga board, not the power one?)

[I already have another identical monitor which works fine, so making this work is not critical, nor do I care about the cost so much, I just wan't to see if I can fix it!]
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jts1957



Joined: 24 Nov 2008
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Location: Far, Far Away

PostPosted: Sat May 28, 2011 10:22 pm    Post subject: Reply with quote

If signal is within specs, try re-seating LVDS cable ends. Otherwise scaler board.
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tftproblem1



Joined: 28 May 2011
Posts: 2

PostPosted: Mon May 30, 2011 7:55 pm    Post subject: Reply with quote

jts1957 wrote:
If signal is within specs, try re-seating LVDS cable ends. Otherwise scaler board.


The signal must be ok, since if i disconnect the vga cable and connect it to another monitor, all appears fine. I don't know if you mean something else.

I reseated the panel end of the LVDS cable, no changes there too. The other end is fixed on the scaler board.. So I'm left with the scaler board.

What should I check there? Could I replace the whole board (where can I find one on that case?) - Its an Acer AL1916W As monitor. I can easily find a power board but no luck with the scaler one :/.

The capasitors look fine on both boards, something weird is happening. I don't know what to check with a multimeter.
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