HP 32E - Zeros in display / blank display.

[ElectroDuende]

(03-10-2015 03:28 PM)PANAMATIK Wrote:  I have a non functional press-fit HP-33E where the 1820-2105 processor Pin 7 is intentionally cut, because there is no signal trace leading away from this pin. But there is another 8-pin chip labeled 00031 A0008SGP where Pin 8 is completely off, no chance to solder a wire. So I have to give up repairing this calculator the easy way?

When that happens to me, and the chip is not easy to find (that I suppose is the case) what I do is using a "dremel" tool to remove a bit of the plastic packaging of the chip exposing about a milimeter of the pin base where a wire can be soldered.

A high power, temperature controlled, thin tip soldering iron is very recommended, but it doesn't guarantee a 100% success... anyway, it seems that you have nothing to loose.