If fixing the board voltages does not remove the problem the next issue could be dry joints near the clock chip, at least on two machines I repaired that was the problem. It looks like the clock chip was placed as a second op when the boards were made and the soldering was not very good. In one case it was a cracked joint near the clock chip and the other was just a really bad joint that had failed over time – there was a hole without any solder. Simply pressing down on the clock chip area allowed the board to work properly.
The fact, in this case, the keyboard does not work seems to indicate that the area near the keyboard connector has problems. The clock chip happens to be in that section of the board too. When the unit is closed the keyboard cables press down quite hard on the board and it does flex very slightly. So an open unit might work and the close unit does not – that’s how I found the issue the first time :) From: M100 <[email protected]<mailto:[email protected]>> on behalf of Stephen Adolph <[email protected]<mailto:[email protected]>> Reply-To: <[email protected]<mailto:[email protected]>> Date: Sunday, January 6, 2019 at 7:44 AM To: "[email protected]<mailto:[email protected]>" <[email protected]<mailto:[email protected]>> Subject: [M100] M100 stuck on the menu with weird date :o( I have at least one machine with this type of error. Would be great to figure out what has to break for that to occur. On Sun, Jan 6, 2019 at 8:37 AM Eric LK <[email protected]<mailto:[email protected]>> wrote: Hi, I'm still waiting for my replacement Ni-Cad battery but I've been continuing using my M100 without any other issue... until tonight. When I turned it on, the "low battery" light was on, and the date displayed on the first line was wrong: ◥5ÿ 00,1919 Sun 00:00:00 I switched it off and on again, and it stayed this way. That's when I noticed the keyboard wasn't responsive. Also the first 3 characters flash every now and then (here is a 11 seconds video: https://www.youtube.com/watch?v=jjUw2XpB0Gw<https://nam03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DjjUw2XpB0Gw&data=02%7C01%7C%7C8f993c2343034bc27abc08d673edca83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636823862467379087&sdata=cmQTskMFM1pM5gjccgKZUieLdyaplQeGjfTzkgt6U18%3D&reserved=0> ; it happens around 00:03) I verified the voltage of the AA batteries and found 5.9V. Should be OK but I still changed them. Now the first line displays something like this: ros ??,1920 ñ)s ??:??:?? ...and the keyboard is still non-responsive I tried the reset button, which had no effect (the computer restarts in the same state), and the whole reset (Ctrl+Break+Reset), which removed all files from the ram filesystem but it's still stuck. After a quick look inside, the Ni-Cad battery didn't seem to have started to leak, and I measured about 4.9V to its pins; I also noted a faint buzzing sound coming from the LCD area while it was open. I also tried to switch the "memory power" switch off, remove the batteries, replace the batteries, switch everything on again... same result. At this point, I'm out of ideas... Any suggestion about how to diagnose and fix this problem? Eric PS: There is a kind of battery leak damage around a screw on the motherboard, but it's nowhere near any battery (it's located on the left of the power switch). I noticed it when I first opened it a few days ago, and I planned to give it a clean with isopropyl Alcohol when I'll change the Ni-Cad but I didn't touch it yet. Could it be related to today issue? Here is a picture : http://pics.lefauve.org/20-32-45.jpg<https://nam03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fpics.lefauve.org%2F20-32-45.jpg&data=02%7C01%7C%7C8f993c2343034bc27abc08d673edca83%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C636823862467535331&sdata=BH6fZ7k9EYctT7nLCuYiHHLEcOcw4qshqrh3uQcEXyQ%3D&reserved=0>
