ACER Monititor V-sweep question

Apr 12, 2006 3 Replies
A

Hi All, I have an ACER model #7278C computer monitor. When it is powered up, the screen appears to only scan the lower half of the screen. There is a bright line accross the middle section of the screen. below that line, it looks OK, the top half is black. The video appears to be cut off, meaning that it is not simply squashed into half of screen. It "Looks" like the top half of the video is collapsed into that bright line, while the bottom half is normal.



I'm an electronics guy by trade, but It's been quite a while since I've repaired TV's or monitors, so I could use some guidance here from you pros. I'm hoping that I can avoid sending this to the landfill.



Any ideas where to start looking?



Thanks very much for any ideas.



Best regards,



-AL



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I

This symptom is often caused by the flyback boost electrolytic or the associated diode, also check if the V-O/P chip runs from split PSU rails - one of them could be absent.

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D

Probably a failed vertical output IC, and/or associated electrolytic capacitors.

Dave

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R

I've had more than one of these have faulty transistors in the vertical signal processing, before the output IC, leaky from collector to emitter,(I think, or was it emitter to base?!?!), any who, these were NTE 123ap, very common with these multi-res monitors. Hope this helps. Cheers, Steve.

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