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Surface mount board repair?
Edgedamage:
--- Quote from: drventure on April 23, 2010, 06:53:37 pm ---Anyone know anyplace that does that sort of thing?
I've got a panasonic ae-900u projector. it got a case of vertical red lines about a week ago. Turns out, it's a pretty common prob with these things.
There are 3 surface mount LCD driver chips (all the same from what I can tell) that control each of the RGB lcd panels. 2 of the chips are mounted to a single heat sink, so It's common for them to get hot, overheat and desolder themselves
That's exactly what Happened to mine. I poked around with it a bit and got the pins resoldered, and believe it or not, the thing started working again.
But now, It works perfectly fine for about 3 minutes, then the screen completely scrambles. I'm guessing the driver chip got hot enough to mess it up internally, and now, once it warms up, the chip gets screwed until it can cool back down.
I found the exact same driver chips online, but I have no idea how I'd actually desolder the old chips and install the new ones.
Anyone know anybody or any company that does that kind of repair work (I'm in the Dallas, TX area, local would be good, but anywhere would be ok).
Thing is, a whole new main board will cost me ~600$, which is about what I paid for the projector in the first place. So any repair that would end up close to that, wouldn't be worth it.
So, repair may not be in the cards anyway, but, it's worth exploring...
I was just totally stoked when, after using binoculars backwards to zoom in on those pins (because they're +unbelievably small+ little traces) and a little soldering and xacto knife wielding, I was actually able to get it to work properly again in the first place (even if only for a few minutes!)
--- End quote ---
Build your own hot air pencil:
http://www.usbmicro.com/documents/ACC430664DD26DDE5986574AAA62775FDFF29EA1.html
drventure:
Hmm. I never even knew about such a thing! Looks like that, combined with a good head mounted magnifier might actually let me resolder things properly.
Thanks for that link!
lilshawn:
--- Quote ---also to the right of the chip on the 2nd fuse down it looks like there is a white spot in the center of the brown center take a look at that close and see if it is melted at all or perhaps take a multimeter and check it or perhaps all 5 on that side.
--- End quote ---
actually what you are looking at is actually capacitors. They are just used to help smooth the signals going in ad out of the chip.
--- Quote ---zooming in on the troubled spot is there damage to the trace on the third pin from the top of the right side where you have it in red?
--- End quote ---
I see that too. maybe a small section of the trace is gone. could just be a lighting thing, but something to check none the less.
drventure:
Yeah, I'm going to pull it back down and attempt some more repairs. I ended up picking up another of the exact same model off CL over the weekend so no hurries now. If I can fix it, yeah, I'll have a backup or something to put up on ebay. If not, I guess I'll have some spare parts.
Maybe that'll buy me enough time to let the lampless projector market build up.
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