Well I don't know what I'm looking yet, but it's fun playing with the analyzer.
I rigged up a breakout for the lcd cable, passing all signals through normally, and tapping some for the analyzer. Started by tapping AD0-AD7 and PA0-PA7. Both these pics are the same motherboard from the bad unit. One with a good lcd board, one with the bad lcd board it came with. bad lcd https://photos.app.goo.gl/4QDlMt1YbEd6pQbl1 good lcd https://photos.app.goo.gl/fpF9cxmsRVeueMUy2 good times https://photos.app.goo.gl/QLV1mZsNqsu4eXkA2 On Sun, Jan 21, 2018 at 1:05 AM, Brian White <[email protected]> wrote: > I finally tried one of the most basic diagnostic steps I should have done > almost first, since I have the parts to do so. I tried swapping the > motherboard, lcd, & keyboard boards around with those from a good M100. > > The motherboard of the dead M100 turns out to be fine. Whatever the > problem is, it's in the display board. (I eliminated the keyboard too) > > > On Sat, Dec 30, 2017 at 10:33 AM, Fugu ME100 <[email protected]> wrote: > >> I would hold off desoldering the SRAM modules until it is established >> where the problem is located. It could be one of the buffers driving those >> chips. I believe someone already mentioned they had an issue with a buffer >> and had to replace it on their broken machine. >> >> The CPU looks like it is doing the right things now it is a matter of >> tracing out the Address, data and control lines to make sure they are >> arriving at the ROM and SRAM correctly. >> >> Since the machine was on battery power when the backup power was turn >> off the SRAMs would of been powered down while still being driven by the >> attached buffers. So they would of been driven in a unpowered state which >> could of damaged their protection diodes causing a short or overloaded and >> damaged a buffer. >> >> I was not aware of the different models I must have really early versions >> as they only have 1 SRAM module soldered in the other three are socketed – >> which is nice for debugging. :) Thanks for that information I keep >> learning more about my machines. :) >> >> From: M100 <[email protected]> on behalf of Mauro Pintus >> <[email protected]> >> Reply-To: <[email protected]> >> Date: Saturday, December 30, 2017 at 6:35 AM >> To: <[email protected]> >> Subject: Re: [M100] diagnose >> >> Yes, my Olivetti M10 has 3 soldered modules for a total of 24k plus a >> free socket for the optional one (see linked pictures below). >> >> I'm gathering courage to desolder all the SRAMs and place a socket on the >> first position hoping that at least one module is fine. >> >> Mauro >> >> >> >> Inviato da iPhone >> >> Il giorno Dec 30, 2017, alle ore 12:25, Jan Vanden Bossche < >> [email protected]> ha scritto: >> >> AFAIK, he's working on an Olivetti M-10... >> Nut, also AFAIK, the M-10 followed the same scheme as the M100. >> >> Greetings from the TyRannoSaurus >> Jan-80 >> >> >> ------------------------------ >> *From:* Mike Stein <[email protected]> >> *To:* [email protected] >> *Sent:* Saturday, 30 December 2017, 6:53 >> *Subject:* Re: [M100] diagnose >> >> They were different models: >> 26-3801 M100, 8K + 24K optional >> 26-3802 M100, 24K + 8K optional >> 26-3803 T102, 24K + 8K optional >> >> m >> >> ----- Original Message ----- >> *From:* Brian White <[email protected]> >> *To:* [email protected] >> *Sent:* Saturday, December 30, 2017 12:44 AM >> *Subject:* Re: [M100] diagnose >> >> >> >> On Dec 29, 2017 11:53 PM, "Fugu ME100" <[email protected]> wrote: >> >> In the T102 and M100 there are SRAM modules that are plugged into >> sockets, I am not familiar with the M10, but these modules are easy to >> remove from the socket and do not need to be desoldered. >> >> >> >> That's not necessarily true. If a particular unit was sold with 8k, then >> it has 1 module soldered, and 3 sockets. If a particular unit was sold with >> 24k, then it has 3 soldered modules and 1 socket. Same is true for both >> m100 and t102. >> >> He most likely has to desolder 3 modules. I definitely do. >> -- >> bkw >> >> >> >> > > > -- > bkw > -- bkw
