Thanks. Dug out another Model T and swapped screens and keyboard.They worked flawlessly as suspected.So the LCD and keyboard side of the equation has been eliminated. On Sunday, August 2, 2020, 08:34:22 AM EDT, Jeffrey Birt <bir...@soigeneris.com> wrote: If you look close you can just see a green trace under that block of solder so it looks like those two pins would be electrically joined anyhow. Sometimes this PCBs had messy solder joints from the factory. Probably the most common issue is a poor connection from the solder not flowing out properly originally and then developing cracks over time.
Ideally the solder forms a tent like shape around the pin and flows down smoothly to the pad. A joint that did not have enough solder or that was not soldered properly will look more like a blob, there will not be a nice smooth transition from pin to pad. The where the solder meets the pad it tends to tuck back under itself rather than flowing out. If you look up at pin 40 in the picture you can see that is more of ball. This is probably a case of just too much solder there. Often times I will put some flux on joints like that and reflow them. It can be tough to find bad solder joints. Sometimes the cracks are obvious under magnification and sometimes they are not. Jeff Birt From: M100 <m100-boun...@lists.bitchin100.com> On Behalf Of Chris Fezzler Sent: Saturday, August 1, 2020 11:36 PM To: M100 Mailing List <m...@bitchin100.com> Subject: [M100] Narrowing down issue, I think Please look at the PCB pic here. It is of the option rom socket from the component side. Those to points are not supposed to be soldered together, are they? My LCD issue may be related if they are not.