HP 30s screen & brain have been water-damaged, but I enjoyed this calculator
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From: Merciadri Luca on 16 May 2010 14:25 On May 16, 6:53 pm, Jeff Liebermann <je...(a)cruzio.com> wrote: > On Sun, 16 May 2010 09:38:14 -0700 (PDT), Merciadri Luca > > <merciadril...(a)gmail.com> wrote: > >Okay, you might check > >http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01... > >(broken board) > > (...) > > Your Sony Ericsson K750 cell phone camera has a macro mode for close > focus. Please use it. With the flash off, you might also need some > more light. > <http://www.mobileburn.com/review.jsp?Page=4&Id=1393> I tried. Sorry, I had forgotten. > If you have a broken trace, just scrape off the insulation with a > small screwdriver and tin what's left of the trace with some solder. > Then, take a fine wire (one strand from a piece of stranded hookup > wire) and solder it over the tinned traces. This does take some > practice. > > Do NOT touch the epoxy mound with the calculator chip under it. Just > pushing on the epoxy will break the wire bonds underneath. Here are some details: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01484.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01486.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01487.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01489.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01490.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01491.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01492.jpg I also noticed that there is some broken trace on another part of the board: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01493.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01494.jpg (`downmost' trace) It seems that the broken part of the trace was too small to ever try introducing a wire there. After having pressed a lot, and tried to solder the whole (without an iron, okay), here is what I get: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01495.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01496.jpg
From: Michael Kennedy on 18 May 2010 11:17 "Merciadri Luca" <merciadriluca(a)gmail.com> wrote in message news:cacfc943-b546-47b3-89ac-f38a5cab41ba(a)o15g2000vbb.googlegroups.com... On May 16, 6:53 pm, Jeff Liebermann <je...(a)cruzio.com> wrote: > On Sun, 16 May 2010 09:38:14 -0700 (PDT), Merciadri Luca > > <merciadril...(a)gmail.com> wrote: > >Okay, you might check > >http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01... > >(broken board) > > (...) > > Your Sony Ericsson K750 cell phone camera has a macro mode for close > focus. Please use it. With the flash off, you might also need some > more light. > <http://www.mobileburn.com/review.jsp?Page=4&Id=1393> I tried. Sorry, I had forgotten. > If you have a broken trace, just scrape off the insulation with a > small screwdriver and tin what's left of the trace with some solder. > Then, take a fine wire (one strand from a piece of stranded hookup > wire) and solder it over the tinned traces. This does take some > practice. > > Do NOT touch the epoxy mound with the calculator chip under it. Just > pushing on the epoxy will break the wire bonds underneath. Here are some details: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01484.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01486.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01487.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01489.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01490.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01491.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01492.jpg I also noticed that there is some broken trace on another part of the board: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01493.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01494.jpg (`downmost' trace) It seems that the broken part of the trace was too small to ever try introducing a wire there. After having pressed a lot, and tried to solder the whole (without an iron, okay), here is what I get: http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01495.jpg http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01496.jpg It looks to me that the traces aren't broken... Only the green solder mask is scratched off. The solder mask is like a acrylic paint to keep stray solder from making a bridge between two different traces. Your problem is elsewhere. And by the way do you know what macro mode on a camera is? It is for taking pictures of things that are very small and close. It ususally has a picture of a small flower on the button. You can focus on the board using macro mode without it being blurry. Example <http://www.popmonkeys.com/wp-content/uploads/2009/01/canon-sd880-video-macro-mode.jpg> Anyhow.. I would check the batteries and see if they are properly seated and are in the correct polarity. Ex. + / - correct. Take some more pictures and come back. Good luck.. Mike
From: Merciadri Luca on 18 May 2010 12:55
On May 18, 5:17 pm, "Michael Kennedy" <m...(a)nospam.com> wrote: > It looks to me that the traces aren't broken... Only the green solder mask > is scratched off. But the first one I shown is clearly broken, isn't it? > The solder mask is like a acrylic paint to keep stray solder from making a bridge between two different traces. Yes. But, take e.g. http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01484.jpg. On this picture, isn't it clear that the trace is broken? > Your problem is elsewhere. Okay, but where, then? I have checked polarities, and everything was working before opening it! > And by the way do you know what macro mode on a camera is? It is for taking > pictures of > things that are very small and close. It ususally has a picture of a small > flower on the button. > You can focus on the board using macro mode without it being blurry. I know. > Example > <http://www.popmonkeys.com/wp-content/uploads/2009/01/canon-sd880-vide...> Upsetting, as I _know_ what a macro mode is. For the first pictures of the thread, I had forgotten that it existed on my mobile phone. But, for the pictures I presented in my previous message, I used the macro mode. Sorry, but it is an old mobile phone (K750i), and the board reflects light. I *did* use the macro mode, and not the zoom. I'm not that stupid. > Anyhow.. I would check the batteries and see if they are properly seated and > are in the correct polarity. Ex. + / - correct. Checked. > Take some more pictures and come back. Which pictures could I ever take? I have no other camera, and http://www.student.montefiore.ulg.ac.be/~merciadri/hp30s_broken/dsc01484.jpg is the best I can do. |