Message #1 Posted by Mark W Paris on 8 Mar 2008, 11:22 p.m.
Please, if you'd assist a pitiable rube like me who still tries to fix old, "junky" calcs...
Question number 1- how many chips do you see when you open the 11c? There are two sets of internals -- I'm asking about the newer one, I think. S/N 2538A.....
I'm pretty sure there are two chips, one rectagular 2:1 and one square, with a locus of unused connectors in between them.
If this is correct -- 2 chips -- then the favor is this: can you send me a high-res, very close up pic of the left-most, larger chip?
I specifically need to see, in ultra-high relief, the connectors toward the bottom side of the calc. This one I'm trying to fix has two connectors, the 2nd and 3rd from the right end, which appear to be soldered together.
NB: If you're kind enough to oblige me do please remember to be careful about the two tiny springs when opening the case.*
The unit is DEAD (tried shunting, holding power button on for 60s, etc). And in excellent condition (the only thing keeping me from writing "mint" is that it's not still shrink-wrapped). I'm thinking it's possible it may never have worked, given the lack of any wear at all. Could its death be the result of too much solder during manufacture shorting these chip connectors?
Any advice further, related, etc. most welcome.
*Thanks to Luiz for useful discussions on HP11c repair from 6(!) years ago.
Edited: 10 Mar 2008, 1:17 a.m.